Undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null,undefined/null Additional Information & Resource Library.Once trees are over 15 feet in height the damage becomes negligible. Trees less than 10 feet tall are at greatest risk. If feasible, it may be helpful to remove blighted shoots, pruning at a junction well below the margin between healthy and diseased tissue. If your sample is from outside of Iowa please do not submit it to the Plant and Insect Diagnostic Clinic without contacting us Management of leaf and shoot blightĪlthough fungicides are available for leaf disease control on poplar, none are labeled specifically for this disease. Contact information for each states diagnostic laboratory for U.S. Please see our website for current forms, fees, and instructions on collecting and packing samples. The Iowa State University Plant and Insect Diagnostic Clinic can help you to investigate and confirm if you plant has this disease. Type of Sample Needed for Diagnosis and Confirmation Trees in crowded plantings are more often severely diseased than those planted on wider spacings. Fungal spores are splashed by rain from shoots blighted the previous season to the newly emerging shoots and leaves. The fungus overwinters in infected shoots. Repeated attacks by the fungus can weaken trees and allow attack by other organisms. As the season progresses and tissues mature, they become resistant.ĭeath of shoots reduces height growth and can deform small trees by causing bends in the stems. Only young shoots and leaves are susceptible. Infected shoots turn black, brittle, and bend over to resemble a shepherd's crook. Irregular brown or black spots form, causing leaves to appear deformed. Signs and symptoms of leaf and shoot blight Poplar leaf with a case of Venturia blight
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