Leaf spot diseases weaken trees and shrubs by interrupting photosynthesis ... on the upper side of the leaf that turn brown with time. Downy clumps of delicate white filaments and spores form on the ...

White pine blister rust (WPBR) kills branches, tree tops and whole trees of Eastern white pine and causes leaf spots and leaf loss in currant and gooseberry plants. WPBR can be found throughout ...