![]() ![]() To determine whether a post-harvest treatment is necessary, examine one shoot on at least 20 trees in your orchard (or 20 shoots on 1 to 2 trees) for the presence of nymphs (usually sitting in a drop of honeydew). The nymphs (young) feed in a bubble of sap (honeydew), and cause the leaf to die at the feeding area.Įarly fall is a good time to treat for pear psylla before the adults migrate to protected areas in leaf litter or on tree bark for the winter. Sweet cherries that show oozing sap from dead buds and twigs, along with clusters of dead leaves or dead shoots, typically means an infection by bacterial canker.ĪPPLE, PEAR Pear Psylla (Commercial Orchards) Pear psylla adults are hardly visible to the naked eye. Research out of Oregon State University has shown that an application of copper in mid to late October can help reduce the incidence of this disease the following spring. Like coryneum blight, new infections enter trees through leaf scars in the fall. ![]() Bacterial Canker on Sweet Cherry A cross-sectional view of a bud and twig affected by bacterial canker.īacterial canker ( Pseudomonas syringae) is a disease of sweet cherry, causing oozing around dead buds, and twig and branch death. If trees have severe infections, it will take at least three years of diligent fall, spring, and summer treatments to suppress the disease incidence. It is these bud infections that then lead to new leaf and fruit infections the following spring. When leaves drop, they leave behind a small open scar, and if any spores land on those scars under the right weather conditions, the fungus will invade the tissue and by the following spring, the associated bud will be killed. This disease affects many parts of the tree, including buds, small twigs, leaves, and fruit, so it is important to prevent new infections from happening in the fall. chlorothalonil (Daconil, Fertilome Broad Spectrum, Ortho Max Disease Control, etc.).copper (Bonide Copper, Lily Miller Microcop, Kocide, C-O-C-S, etc.).Use a product that contains one of the following ingredients: The optimal timing is when 50% of leaves have dropped from the trees. The time to treat coryneum blight (also known as shothole) is coming up. PEACH/NECTARINE, APRICOT, PLUM, CHERRY Coryneum Blight New coryneum infections occur in the fall on fresh leaf scars, so be sure that the spray at 50% leaf drop covers these areas. ![]()
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