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Scrapping on leaves
Scrapping on leaves
The adult beetles scrap the sprouting buds after each pruning. Damaged buds fail to sprout. The beetles also feed on tender shoots and leaves; and tendrils causing substantial damage. The tender shoots may wither and drop down. The losses are heavy when the sprouting buds are damaged after forward pruning. Damage is caused by adult beetles feeding on primary buds; which prevents them from developing into shoots; thus resulting in a decreased yield. The greatest economic loss occurs when beetles feed on buds from “bud swell” until the “first leaf separates from the shoot tip” stages.