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Apple Scab

Leaves, flowers, fruit and succulent twigs are susceptible to infection from.  However, on landscape trees (especially crabapples), foliar blight is the most important outcome of the disease.  Blighted foliage becomes chlorotic (yellow) to brown and is prematurely shed from the canopy. During years with wet spring weather, significant volumes of foliage can be shed from the canopy early in the growing season. For cultivars that are highly susceptible, defoliation can occur, but this often happens late in the growing season and has only minor effects on the overall health of the tree. collect and discard foliage that is shed throughout the growing season to reduce inoculum at the site. When foliage is left under infected trees, spores produced by the fungus the following spring are in close proximity to newly developing foliage, readily perpetuating the next annual cycle of infection. Pruning and removal of branches and shoots on interior, shaded portions of the canopy can improve air flow and light, which are inhibitory to disease development and spread.