Greenhouse Study of the Effects of Three Early-season Pests on 19 Apple Selections

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Twenty-four trees from 19 selections growing in a greenhouse were infested with redbanded leafrollers (RB), Argyrotaenia velutinana (Walker); plum curculio (PC), Conotrachelus nenuphar (Herbst); and codling moth (CM), Cydia pomonella (L.), at a stage of tree development comparable to that available for infestation by the first brood of RB and CM and the single generation of PC in Indiana. Because this test was conducted under conditions that limited biological and environmental stresses that these pests encountered, it allowed us to estimate interactions that the pests may exert on one another. We found no significant interactions between the pests, using 11 criteria (damage to fruit and plant, and pest development). Results indicated that the pests behaved independently with little competition among them for the same resources. Fruit damage was relatively slight and amounted to <8%. Generally, the differences in damage to leaves or fruit between the selections tested was not significant (P < 0.05). The number of leaves affected by RB indicated significant (P < 0.05) differences between rootstocks, demonstrating that selections growing on Mailing XXVI rootstock had fewer leaves rolled than on MVIIA. A similar situation was evident for PC feeding scars and PC feeding scars plus oviposition stings. Significant (P < 0.05) differences also were found for CM entry holes and CM entry + exit holes when Mailing XXVI was compared to Mailing VIIA rootstock.

Document Type: Research Article

Publication date: April 1, 1985

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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