Aspects of larval development, intershrub movement, and nut infestation by hazelnut weevils
Host plants of No. American species of Curculio Life cycle of Curculio weevils Curculio obtusus Curculio obtusus on Corylus cornuta (hazelnut weevil on beaked hazelnut)
Corylus cornuta, beaked hazelnut shrub with nuts Birds-eye view of study site Ranges of hazelnuts and hazelnut weevils Questions, hypotheses, objectives: larval development, intershrub movement, and host plant qualities Map: Locaton of study site at T32 MD, Maine 1. Larval development: Objectives Larval development: Methods Graph: nut conditions among sequential samples of beaked hazelnuts, 12 June to 4 Sept. 1995 Evidence of weevil punctures on outer husk of beaked hazelnuts Weevil punctures in beaked hazelnuts Weevil egg in soft shell of nut--a gall will form around it Gall-enclosed weevil egg just about to eclose 1st-instar hazelnut weevil in lining of hazelnut shell 3rd instar devouring nut kernel 4th instar, almost ready to emerge 4th instar chewing out of nut shell Mean widths of larval head capsules at 4 stages: Follow Dyar's Law Graph: Percent of larval instars among sequential samples of beaked hazelnuts, 20 June to 4 Sept. 1995 The uncommon occurrence of 2 eggs in 1 gall

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