Adults lay eggs in spring on blackberry or raspberry canes. The eggs are pretty much cemented to the canes and hatch in 4-24 days depending on temperature. The white grubs bore into the cane causing the bark to swell. Adults attack foliage and leave holes in the upper leaf surfaces during the day.
Canes die and may not produce the next season if there is an infestation on any part of the plant. Swelling of the canes (galls) is the only real way to tell if you have a problem.
Controls include cutting off and destroying (burning) infested canes. Some studies have found that parasitic wasps kill the pest as well as fungal diseases that the plant may contract.
If 10% or more of your canes are affected, it's best to start using some sort of control.
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