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Journal of the Department of Agriculture, Western Australia, Series 3
Apple weevil, Apple Curculio, Otiorrhynchus cribricollis Gylh, Insecticides, Prevention.
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The damage caused by the apple weevil or apple curculio (Otiorrhynchus cribricollis Gylh) takes several forms, the most apparent being marginal leaf damage. However, the bark chewing habit probably has a more direct effect on yield for it may cause ring-barking of the main leaders and growing shoots with their consequent die-back and the prevention of full development of immature fruit. The larvae or grub forms may also cause some root injury.
Shedley, D. G.
"Insect pests and their control - Apple Curculio - Preliminary report of an experiment,"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 5:
5, Article 18.
Available at: https://library.dpird.wa.gov.au/journal_agriculture3/vol5/iss5/18