If grubs are found, control measures should be taken after harvest, when the adults emerge. Sprays directed to adults are not usually very effective. Check with your state's Department of Agriculture to find out if your state has such a SLN label. Strawberry plants are weakened, stunted, or killed as one or more larvae bore downward in the crown. Field borders or the portions of fields nearest older, infested plantings are often most heavily damaged.
Infestations spread slowly.
Leaves of infested plants might turn red. The adult beetles chew many small round holes in leaves in the fall, but this defoliation rarely is economically damaging. They have a short thick snout. Their backs are marked with three pairs of dark spots. They become active in the spring at about the same time that strawberries begin to bloom.