Yellow Rust

Red raspberry leaves show yellow-to-orange spots in spring and early summer with orange spore pustules on leaf undersides. Phragmidium rubi fungus overwinters on trapped old leaves. Fruit dies before maturing if infection is early. Remove old canes immediately after harvest. Strip leaves from primocanes before tying. New races now infect previously resistant cultivars like 'Meeker' and 'Willamette'.

Burying fallen leaves, old cane stubs, and refuse before new leaves appear will help eliminate inoculum sources. In home gardens, destroy fallen leaves and other refuse.