Pests
A number of insect and disease problems can affect raspberries, such as root weevils, leaf- roller larvae, spider mites, aphids, powdery mildew, anthracnose, Verticillium wilt, and phytophthora root rot. Cold injury can cause crop loss; blackcaps are the most sensitive to cold, but red raspberries also can be injured, depending on year and produc- tion region. Hot summers may sunburn fruit or cause ultraviolet (UV) light damage; symptoms include white drupelets.
Possible Problems of Raspberries
Symptoms Probable Cause
Leaves curled and discolored; honeydew evident on undersides of leaves, sometimes sooty mold forms - Aphids
Black sooty mold on honeydew made by ants herding aphids. - Ants Herding Aphids
Small holes in canes surrounded by sawdust; leaves wilt - Borers
Very young canes cut off at soil level - Cutworms
Small misshapen fruits - Larvae Of Fruit Flies
Holes in leaves and flowers - Japanese Beetles
Foliage yellowed or white mottling, glaze of honeydew; plant weakens - Leafhoppers
Holes in fruit; leaves rolled up - Leafrollers
Leaves yellowed and may (drop)- Psyllids
Plants grow slowly; stunted; edge of leaves chewed - Root Weevils
Weaken plant, stunting growth, fewer blooms and fruit. - Sawflies
Leaves yellow, drop; bumps on leaves and stems; sometimes sticky material on leaves - Scale
White spots on leaves; eventually entire leaf is covered with powder - Powdery Mildew, A Fungal Disease
Orange or brown pustules on leaves - Rust , A Fungal Disease
Yellowing of foliage and gradual defoliation; plants may become stunted - Verticillium Wilt, A Fungal Disease
Fruit disappears; purple bird manure on property - Birds
Plants disappear all or in part - Deer
Young canes disappear all or in part - Rabbits
