How-To Features Tree Registry Register your trees for customized advice. Fall Care Kits Prepare your trees and shrubs for winter with this kit containing specially formulated fall fertilizer and the TreeHelp Bug Band insect trap. Pecan Scab Severe scab infections on nuts. With warmer temperatures and rainfall in the spring, fungal spores are produced on the stroma. Dew and rain spread spores locally within a tree, and the wind spreads them over long distances to adjacent trees or orchards.
All tissues are most susceptible when young and actively growing.
Lesions expand and may coalesce. Old lesions crack and fall out of the leaf blade, giving a shot-hole appearance. Nut infections cause the greatest economic damage. Early infections may cause premature nut drop but more commonly cause the shuck to adhere to the nut surface, causing sticktights. Late infections can prevent nuts from fully expanding and decrease nut size.