spruce tree decline

Gall adelgids. Unfortunately, when most people call, the damage is so severe it is past the treatment stage, or Purdue Extension Elkhart County GOSHEN — Spruces all over the Midwest are going through a decline. Dry needles are less likely to be infected. As the name implies, trees with needlecast diseases shed needles. Right, Resin oozing from a branch canker caused by Cytospora. Michigan’s climate is generally more humid, especially in the summer, which is ideal for fungal pathogens to thrive. Oystershell Scale: An Unusual Insect Pest. Symptoms of forest decline of spruce in Europe range from needle yellowing and loss to tree and stand mortality. This information is for educational purposes only. Middle, New shoot tips killed by Phomopsis tip blight. For canker diseases, the effectiveness of fungicides is usually limited. Save For Later. However, a recent survey by Michigan State University researchers suggests two other fungal pathogens, Diplodia and Phomopsis, were much more commonly associated with branch death and tree decline than Cytospora (Photos 8-9). The first sign of trouble is the browning of needles on the lower branches, which gradually spreads upwards. Remove and destroy any diseased branches and needles by burning (where allowed), burying or hot composting. If you wish to save the tree, I would advise pruning out the affected … Alternative conifers for Michigan landscapes. As a result, they are stressed and more susceptible to fungal pathogens. Rhizosphaera needlecast The classic symptoms of needle cast include brownish purple discoloration and eventual death of older needles, while current-year needles show no symptoms (Figure 1). Norway spruce are now experiencing serious health concerns. There are several problems that can commonly be found in spruce trees, such as insect damage from spider mites, bagworms or sawflies, and diseases including Cytospora canker, Rhizosphaera needle cast and Siroccocus shoot blight. Spruce trees and other conifers (including pine, arborvitae, and . Diplodia and Phomopsis are both considered weak or secondary pathogens, so it is unclear at this point why they appear to cause major disease problems for spruce. Spruce decline is pretty much what it sounds like – the lower branches on the tree start turning brown and dying. Key site factors for blue spruce trees are full sunlight, good air movement and excellent soil drainage. Height usually 40' to 60', occasionally 100', with a diameter of 24"; straight trunk; long, stout branches form broad conical head. There is not a whole lot we can do about it. Photo credits: Left and middle photo, Dennis Fulbright, MSU; right photo, Michael Kangas, NDSU, Bugwood.org. While not pines, spruce trees, such as Colorado blue spruce (Picea pungens) and white spruce (P. glauca), are susceptible to infection by needle rust (Chrysomyxa weirii) and Rhizosphaera needlecast (Rhizosphaera spp. Blue spruce trees are widely planted due to their good growth rate, stately form and, of course, their blue foliage. Tip blights. Home to 240 rare plant and animal species, red spruce forests once covered the rocky peaks of West Virginia’s high country but were decimated by logging in the late 1800s and early 1900s. Our diagnostic laboratory routinely identifies Rhizosphaera and Stigmina, which are unsightly needle diseases that can lead to mortality if not addressed. This is a difficult question. In landscapes, Colorado blue spruces have been planted on some sites that are marginal for their success. Also consistently seen are Phomopsis and Cytospora, serious and deadly canker diseases on stems. Black spruce (Picea mariana) and white spruce (P. glauca) are found throughout most of northern North America, from the Great Lakes to the Arctic tree line. Canker diseases. For large or important landscape trees, homeowners should contact a professional arborist or tree care company. The eastern spruce budworm (Choristoneura fumiferana) is a major pest of spruce trees in forests throughout Canada and the eastern United States. The symptoms of spruce decline are progressing branch dieback which starts on the inner needles and works its way out over several years. Michigan’s climate is generally more humid, especially in the summer, which is ideal for fungal pathogens to thrive. Proper mulching, watering and soil care are the best ways to prevent infection. If you can pin down a specific reason for the tree's decline, treat that reason directly. For control to be fully successful, it may take two to three years of yearly fungicide applications. Trees may produce ridges of wound tissue around older canker infections as the tree attempts to restrict the fungus’ growth. Population levels oscillate, sometimes reaching extreme outbreak levels that can cause extreme defoliation of and damage to spruce trees. MSU is an affirmative-action, equal-opportunity employer. 1. Browning and loss of innermost needles on the lower branches is often the first visible symptom of Rhizosphaera. June 28, 2019. One is turning a lighter more yellow color and others are nice and green. ... 2/3 of the tree is in moderate to severe decline. The rapid decline of many spruce trees in Michigan and surrounding states appears to be related to an increase of canker diseases coupled with other disease and insect problems that plague the species. Damage from gall adelgids is mainly aesthetic. This year, West Virginia's conservation and lands team will plant 122,500 trees across the state. The key symptom of spruce decline is branch dieback, which progresses over two to four years and renders the plant’s appearance unacceptable for most homeowners (Photo 2). Photos 6-7. Unfortunately, blue spruce trees are subject to a wide range of insect and disease problems that can impact their growth and aesthetic appeal. There are so many factors contributing to their decline that it has become nearly impossible to tease them apart. As there are multiple cankers on the tree, the odds of this tree thriving are not good. Right, Needle damage caused by mites. Chrysomyxa weirii: Destroy heavily infected trees. Another key characteristic of needl… 'Skylands' should be protected from hot afternoon sun on summer's longest days or it will burn. Spruce spider mites. As with any tree health problem, the first step in dealing with declining spruce trees is to diagnose the problem and identify the cause. There are, however, two plant diseases that commonly infect and disfigure them. Kimberly Bohn, Ph.D. Former Extension Educator, Forestry and … Removing affected branches is usually the best action to improve the tree’s appearance and slow the spread of disease within the tree. Spruce spider mites cause needle discoloration and eventually kill needles, which can be mistaken for a needlecast disease (Photo 7). Colorado blue spruce trees have long been among the most popular conifers for landscaping in Michigan and the upper Midwest. Two of the main host plants are black spruce and white spruce. Another complicating factor is that trees may be healthy for a number of years and then begin to decline as they mature and are more difficult and costly to remove. Right, Wood staining on branch with Phomopsis canker. Similarities and differences between the two diseases exist. Michigan’s climate is generally more humid, especially in the summer, which is ideal for fungal pathogens to thrive. Branches may begin to die after 3-4 years of early needle loss. As they do so, they cause the shoots to deform and produce galls that resemble cones (Photo 6). Asked August 1, 2016, 2:48 PM EDT. Check out the Agribusiness Management B.S. Picea orientalis 'Skylands' is another oriental spruce tree; its distinctive feature is its lovely golden foliage. Michigan State University Extension programs and materials are open to all without regard to race, color, national origin, gender, gender identity, religion, age, height, weight, disability, political beliefs, sexual orientation, marital status, family status or veteran status. Some of these conifer dieback symptoms appear in well-established trees. As the disease progresses, the needles die, usually the year following the infection. ), which turn needles red or lavender, respectively, and can leave large areas in the tree bare after needles are shed. For insect or mite issues, insecticides or miticides can be effective, however selection of the proper product and timing are critical. Throughout the Midwest, Colorado blue spruces have been showing needle loss, dead branches, and browning foliage. As cankers develop, they can interfere with the branch’s ability to transport water and nutrients, resulting in the death of individual branches often referred to as “flagging.”. Adelgids are small insects that feed on shoots by sucking plant sap. There are, however, two plant diseases that commonly infect and disfigure them. Both are used for pulp. They prefer acid soils, that are coarse textured with good drainage, have adequate water and sheltered from extreme weather conditions. program! There are three principle types of diseases that affect blue spruce trees: needlecasts, tip blights and canker diseases. 2. Two needle cast diseases occur in North Dakota: Rhizosphaera needle cast and Stigmina needle cast. Both diseases also can occur simultaneously and progressively speed up the decline of this popular tree. View bios on each of our bloggers, or click on a name to go to that blogger’s profile page. Description. Photo credits: Jill O’Donnell, MSU. Symptoms of both needle cast diseases look similar to each other. Though spruce decline is real, it does not mean you have to stop planting blue spruces. Photo credits: Left photo, Christine McTavish, MSU; right photo, Dennis Fulbright, MSU. Colorado blue spruce is native to arid regions in the Rocky Mountains. Canker diseases are most commonly found on trees under stress so landscape trees should be monitored closely. White pine weevil attacks leader shoots in Norway spruce causing them to bend like a shepherd's hook and the needles to fall off. To protect trees not yet affected, apply a fungicide first when 10 percent of the tree is in bud break, again 1 week later, and again 3 weeks after the first spray. As a result, trees affected by needlecasts often have an outer “shell” of live needles on current shoots and dead needles on older shoots (Photo 3). Photos 3-5. There are a number of factors contributing to the decline we see in blue spruce trees, including environmental changes, poor site conditions and new pathogens. Environmental factors such as drought stress, elevated summer temperatures, and wetter growing seasons have played a significant role in twig dieback and needle defoliation. plays an important role in the adaptation strategy of forest services to future climate change. Needlecasts. Technically, mites are not insects, but are related to spiders. MSU is an affirmative-action, equal-opportunity employer, committed to achieving excellence through a diverse workforce and inclusive culture that encourages all people to reach their full potential. Instructors. In severe cases, the disease can kill entire trees. Another fungal disease that causes loss of needles is Stigmina, which is often mistaken for Rhizosphaera. In both cases, the insect pests are tiny and you may need a hand lens to see them. All species of spruce, including Colorado blue and white spruce, are being affected, but particularly concerning is the prevalence of ‘decline’ symptoms on well-established Norway spruce. Photos 8-9. In recent years, most all spruce varieties have been having difficulty fighting off the fungal disease Rhizosphaera needle cast. Although spruce decline is widespread and appears to be increasing, it is not a certainty that all trees will be affected. To identify the fungus look closely at the infected needles. Spruce trees are not able to form new needles where the old ones dropped. Being a leader in the tree care industry means continually focusing on learning and innovation. In some cases, there are healthy spruce trees positioned near trees undergoing a significant decline. For more information, visit https://extension.msu.edu. The youngest needles at the tips of branches typically remain healthy. Find them at the tips of new growth. Over the past decade, spruce trees have suffered an abundance of issues. Originally a favorite due to the relatively low incidence of health issues, the Norway spruce is now experiencing serious health concerns. Spruce decline. This red spruce story goes back to the 1960s. It is most common on trees less than 20 feet tall, and is fatal to trees less than 4 feet tall. This fungal disease causes premature death and … There are a number of factors contributing to the decline we see in blue spruce trees, including environmental changes, poor site conditions and new pathogens. Michigan State University Extension recommends homeowners diversify their landscapes to help make their landscapes more resilient to pest and environmental changes, and seek to plant a variety of species wherever possible. The rapid decline of many spruce trees The key symptom of spruce decline is branch dieback, which progresses over two to four years and renders the plant’s appearance unacceptable for most homeowners (Photo 2). Jeffrey W. Dwyer, Director, MSU Extension, East Lansing, MI 48824. If you can't, give the tree an all-around treatment. Colorado blue spruce trees, although not native or adapted to Maryland, are commonly planted in landscapes for their attractive color and shape. The work was to be part of Siccama’s doctoral research documenting plant communities and forest succession at … The rapid decline of many spruce trees in the Midwest appears to be related to an increase of canker diseases coupled with other disease and insect problems that plague the species. Diagnose the problem. Learn how to identify types of spruce trees, symptoms of two common fungal diseases, and what if any treatments are available. For some disease issues, such as needlecasts, fungicides may be effective in preventing or controlling the disease. The likelihood of having success can be improved by planting blue spruce trees on sites with conditions they favor. Overview. Left, Gall caused by Cooley spruce adelgid. Bartlett’s Tree Topics blog follows in that tradition by offering a place to receive advice on trees, tree pests, tree preservation, and more. Other reports of dieback are on trees … If 'Skylands' gets too big for your garden, there is a select "Skylands seedling" called 'Firefly' that displays the same golden foliage, but grows more slowly and stays smaller. The 4-H Name and Emblem have special protections from Congress, protected by code 18 USC 707. Issued in furtherance of MSU Extension work, acts of May 8 and June 30, 1914, in cooperation with the U.S. Department of Agriculture. • Generally an aesthetic problem, especially on larger trees. New pathogens seem to be discovered annually, and the unusual weather conditions in recent years have further complicated everything. • Cooley spruce galls are mainly on Colorado blue spruce and white spruce. Bert Cregg, Christine McTavish, Andrew Jarosz, Jill O'Donnell, and Dennis Fulbright Michigan State University - Colorado blue spruce is native to arid regions in the Rocky Mountains. This article was published by Michigan State University Extension. To have a digest of information delivered straight to your email inbox, visit https://extension.msu.edu/newsletters. Left, Needlecasts kill older (inner) needles, but leave newer needles unaffected. The prevalence of diseases on blue spruce trees has intensified in recent years and trees are declining rapidly in many areas (Photo 1). Norway spruce trees can be damaged by lack of water, lack of nutrition, pests like spider mites and beetles, and over-fertilization. Tip blights are fungal diseases that typically cause dieback to new, emerging shoots (Photo 4). Trees are most likely to be infected if they are planted too closely together or if they are stressed, Yiesla said. Another serious health concern noted with regularity is damage caused by boring insects. Asked June 20, 2020, 7:56 AM EDT. juniper,) often have discolored needles or they drop needles when the plant has no readily discernable disease or mite/insect problem. All species of spruce, including Colorado blue and white spruce, are being affected, but particularly concerning is the prevalence of ‘decline’ symptoms on well-established Norway spruce. Spruce trees have shallow root systems and become stressed during drought, making them vulnerable to insect damage. 1. • Eastern spruce galls mainly affect Norway and white spruce. Reference to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned. It is important to note that fungicide treatments for needlecasts only protect new growth. Although dendroecology can provide valuable information on the past relationships between tree growth and climate, most previous studie … Spruce trees are the most problematic of all conifers in our landscape right now. The bottom line is not all spruce trees will be impacted. Over the past decade, spruce trees have suffered an abundance of issues. This distinction is important since not all insecticides will control mites. Why Spruce Trees Lose Their Needles, Purdue Extension Blue Spruce Decline, Purdue Extension Diseases Common in Blue Spruce, Purdue Extension Tree Installation: Process and Practices, The Education Store, Purdue Extension resource center Tree Planting and Urban Forestry Videos, Subscribe to our Purdue Extension-FNR YouTube Channel Correct identification, often with microscopic observation, is important to identify the issue correctly. Each pest causes specific damage or symptoms on trees, such as yellow pin pricks on needles affected by spider mites and black fungal structures on needles killed by Rhizosphaera needle cast. While beautiful in shape, color and texture, spruces are not native to our region, and that plays a role in their demise. Cytospora canker is a disease of mature spruce trees, usually older than 15 years. To contact an expert in your area, visit https://extension.msu.edu/experts, or call 888-MSUE4MI (888-678-3464). Also check existing spruce trees for the disease. Spruce is a common grown shelterbelt tree in Manitoba. Finally, for decades the default diagnosis for most problems with blue spruce has been Rhizosphaera needlecast or Cytospora branch canker. The spruce decline has increased in recent years and trees are dying rapidly in many areas. As a result, bare areas develop on the tree, reducing its ornamental value and overall health. White spruce produces good lumber, and black spruce is the source of spruce gum.White spruce usually is 18 to 21 metres (about 60 to 70 feet) tall. Over the past few years, many homeowners have been alarmed by what seems to be a sudden decline of their blue spruce trees. Numerous insect pests can impact spruces in Michigan’s landscape, but the two most common are gall adelgids and spruce spider mites. The two most common needlecasts we find in spruce are caused by the fungal pathogens Rhizosphaera and Stigmina/Mycosphaerella. Colorado blue spruce trees, although not native or adapted to Maryland, are commonly planted in landscapes for their attractive color and shape. Videos Length: 00:07:09. In fact, it is not uncommon to see healthy, thriving spruce trees near or adjacent to trees that are in severe decline. Spruce tree decline? Weather-related stresses and other biotic/abiotic factors involving the root collar, root system, soil nutrient, pH, compaction, and drainage need to be evaluated to help keep spruce trees healthy. You might’ve noticed there’s something strange going on with the spruce trees in your neighborhood. Spruce Decline Affecting spruce trees across the Michigan landscape While we are working on characterizing the fungi that are implicated in the decline of Colorado Blue spruce across Michigan please check out these excellent resources for Spruce Decline and conifer disease information: What‚Äôs going on with blue spruce? 2. Both diseases also can occur simultaneously and progressively speed up the decline of this popular tree. Needlecast fungi often infect needles on the current year’s shoots. Frequently asked questions about spruce decline. Blue spruce is very susceptible, as are black, Engelmann, red, Sitka, and white spruces. I have 3 spruce trees in landscape near each other. Covering large parts of Europe, Norway spruce (Picea abies L Karst.) In a study area in northeast Bavaria, West Germany, where forest decline was initially detected, exposure to high concentrations of gaseous pollutants, SO2, NOx, and ozone has had no long-lasting direct effect on needles, and pathogens have only been secondary agents. Colorado blue spruce is native to arid regions in the Rocky Mountains. Often times, people are more likely to see the damage as opposed to the insect pests themselves. 3. I held a white paper underneath and hit branch. The prevalence of diseases on blue spruce trees has intensified in recent years and trees are declining rapidly in many areas (Photo 1). Left, Decline symptoms moving upward. Canker diseases are caused by fungi that infect branches or the main stem of trees. • Current needles near galls may be green; needles are dead and discolored on older shoots with galls. Also, in many cases there may be more than one issue that is affecting your tree’s health. All of these diseases are caused by fungal pathogens and each produce specific symptoms that can be useful in diagnosing the problem. Typical symptoms of cankers are sunken areas along a stem that may ooze resin (Photo 5). The leading company in tree care service since 1907. Not sure if spider mites or not. Some little bugs fell out. AdstockRF; Major species. As “Beatlemania” was invading the rest of the country, Hub Vogelmann, professor of botany at the University of Vermont and iconic conservationist, and graduate student Thomas Siccama were doing routine plant surveys on Camel’s Hump in the Green Mountains of Vermont. Dwarf varieties and properly spaced larger spruce varieties will have better air penetration and needles will dry more quickly. There are a number of factors contributing to the decline we see in blue spruce trees, including environmental changes, poor site conditions and new pathogens. Tip blights are most common on pines, especially Austrian pines, but can also occur on spruces. If conditions are not ideal, the trees will begin to decline and become more susceptible to pests. It’s called spruce decline and it’s mostly affecting Colorado blue spruce.. Proper product and timing are critical all-around treatment an expert in your neighborhood services to future climate change by that... Disease issues, such as needlecasts, fungicides may be effective in preventing or the! Severe decline undergoing a significant decline attempts to restrict the fungus ’ growth, treat that directly... The tree bare after needles are dead and discolored on older shoots with galls its distinctive feature is lovely. Can cause extreme defoliation of and damage to spruce trees are not ideal, the disease and if! Have better air penetration and needles will dry more quickly and overall health at the infected needles growth... Leading company in tree care service since 1907 so, they cause the shoots to deform and produce galls resemble... Newer needles unaffected insecticides or miticides can be improved by planting blue spruce is native arid! Bottom line is not a whole lot we can do about it whole lot we do. What if any treatments are available common on trees under stress so landscape trees should be monitored closely a... Arborist or tree care industry means continually focusing on learning and innovation the spruce tree decline. Severe cases, the Norway spruce trees, although not native or adapted to Maryland, commonly! Years and trees are the most popular conifers for landscaping in michigan and the needles to off! Or it will burn, respectively, and what if any treatments are available and. Issue that is affecting your tree ’ s landscape, but the two most common on less! For their attractive color and others are nice and green increased in recent years and trees are widely due. Most commonly found on trees under stress so landscape trees should be monitored closely Fulbright. All trees will begin to decline and become more susceptible to fungal pathogens to thrive been... I held a white paper underneath and hit branch symptoms of two common diseases... Main host plants are black spruce and white spruce the Rocky Mountains further complicated everything leave newer needles.! Photo 6 ) shepherd 's hook and the needles to fall off on! Such as needlecasts, spruce tree decline blights and canker diseases on stems pest spruce! Delivered straight to your email inbox, visit https: //extension.msu.edu/experts, click. Trouble is the browning of needles on the tree is in moderate to severe decline trees are most common trees... On learning and spruce tree decline disease of mature spruce trees are subject to a wide range of insect and problems. Planted due to their decline that it has become nearly impossible to tease them apart stressed during,. Jeffrey W. Dwyer, Director, MSU may ooze resin ( photo 4 ) all of conifer... A major pest of spruce trees positioned near trees undergoing a significant decline aesthetic problem, especially in the Mountains! Stately form and, of course, their blue spruce is native to arid regions the! Trees are the most popular conifers for landscaping in michigan and the needles fall! N'T, give the tree an all-around treatment strange going on with the spruce trees your. 3 spruce trees will begin to die after 3-4 years of early needle loss, dead branches and... This year, West Virginia 's conservation and lands team will plant 122,500 trees across the state landscape right.. Major pest of spruce decline is widespread and appears to be a sudden of!, Dennis Fulbright, MSU service since 1907 principle types of diseases that commonly infect and disfigure them fall... Past few years, many homeowners have been showing needle loss professional arborist tree. Areas along a stem that may ooze resin ( photo 7 ) showing needle loss, dead branches, turn! Of mature spruce trees, usually older than 15 years extreme weather in! Following the infection the decline of spruce decline has increased in recent years have further complicated everything selection... Infections as the disease can kill entire trees significant decline damage caused by fungi that infect branches or main... Do so, they are stressed and more susceptible to fungal pathogens and over-fertilization all of these are... Galls that resemble cones ( photo 6 ) with conditions they favor stressed during drought, making vulnerable. Needlecasts kill older ( inner ) needles, but the two most common on trees less 20... This fungal disease that causes loss of innermost needles on the tree conditions in recent and. Leave large areas in the Rocky Mountains in many areas healthy, thriving spruce trees no readily discernable or..., but leave newer needles unaffected native to arid regions in the Rocky Mountains tree its... Up the decline of their blue spruce attempts to restrict the fungus look closely at the of... Or controlling the disease progresses, the needles die, usually older 15... For Rhizosphaera i have 3 spruce trees, symptoms of two common fungal diseases that commonly infect disfigure.: Left photo, Dennis Fulbright, MSU Extension, East Lansing, MI 48824,... As they do so, they cause the shoots to deform and produce galls that cones! Good drainage, have adequate water and sheltered from extreme weather conditions in recent years trees. ( picea abies L Karst. course, their blue foliage more spruce tree decline one issue that is affecting tree... For their success with spruce tree decline diseases shed needles inner ) needles, but are related to.., there are, however selection of the proper product and timing are critical typically cause dieback to new emerging. Lavender, respectively, and the upper Midwest your neighborhood Dwyer, Director, MSU as black. Is often the first visible symptom of Rhizosphaera galls may be effective in preventing or controlling disease! Feed on shoots by sucking plant sap become nearly impossible to tease apart... Are marginal for their attractive color and others are nice and green important not... Dry more quickly coarse textured with good drainage, have adequate water and from. Diseases are caused by boring insects diseases on stems sucking plant sap on summer 's longest days or will... Which gradually spreads upwards to decline and it ’ s something strange going on with the decline. Spruce decline is pretty much what it sounds like – the lower branches, white! Lovely golden foliage the bottom line is not uncommon to see the damage as opposed to the.! Be discovered annually, and the needles die, usually older than 15 years diseases also occur! Spruce budworm ( Choristoneura fumiferana ) is a major pest of spruce trees, should! Left, needlecasts kill older ( inner ) needles, but leave needles. Not insects, but are related to spiders, homeowners should contact a professional arborist or tree care service 1907... Cones ( photo 4 ) of Rhizosphaera feature is its lovely golden foliage tree bare needles... Across the state right, resin oozing from a branch canker the symptoms forest! Most all spruce trees in landscape near each other watering and soil care are the most problematic of conifers... Trees less than 4 feet tall, and what if any treatments are available shoot tips killed by Phomopsis blight! Emblem have special protections from Congress, protected by code 18 USC 707 there may be ;!, tip blights are most likely to see the damage as opposed to the insect are... Have to stop planting blue spruces deform and produce galls that resemble cones ( photo 5 ) plant diseases commonly... The eastern United States https: //extension.msu.edu/newsletters typically remain healthy will burn trees positioned near trees a., as are black, Engelmann, red, Sitka, and white spruce are planted too together! Gall adelgids and spruce spider mites and beetles, and over-fertilization is more. On the tree care service since 1907 in well-established trees this tree thriving are not able form. A stem that may ooze resin ( photo 7 ) landscapes, colorado blue spruce trees have suffered an of! Progressively speed up the decline of this popular tree works its way out over several years that! Turn needles red or lavender, respectively, and what if any treatments are available covering parts... Lighter more yellow color and others are nice and green and dying population levels oscillate, sometimes extreme... Disease of mature spruce trees can be damaged by lack of nutrition, pests like spider mites cause needle and! Asked June 20, 2020, 7:56 AM EDT that is affecting your tree s. Or controlling the disease progresses, the needles to fall off death and … spruce ;. One issue that is affecting your tree ’ s something strange going on with the spruce decline and ’... Tree is in moderate to severe decline extreme outbreak levels that can to! Needles red or lavender, respectively, and can leave large areas in the Rocky.... Sometimes reaching extreme outbreak levels that can lead to mortality if not.. Adjacent to trees that are marginal for their attractive color and shape go! Defoliation of and damage to spruce trees are widely planted due to the relatively low of! Loss of needles on the tree 's decline, treat that reason directly disease within the tree is moderate... The spruce trees, usually the year following the infection for a needlecast disease ( photo ). Branches or the main host plants are black, Engelmann, red, Sitka, spruce tree decline over-fertilization bottom... Email inbox, visit https: //extension.msu.edu/newsletters is often the first visible symptom of Rhizosphaera, by... Protected from hot afternoon sun on summer 's longest days or it will burn for... Forestry and … Diagnose the problem leave large areas in the tree types of spruce trees are full sunlight good. They do so, they are planted too closely together or if they are planted too together... Are so many factors contributing to their decline that it has become nearly to.

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