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Research toward Control of Key Pecan Insect Pests Using Biorational Pesticides

David I. Shapiro-Ilan, Ted E. Cattrell, Mark A. Jackson, Bruce W. Wood
Pecan grower 2013 v.24 no.3 pp. 30-38
Chromobacterium, Citrus, Curculio caryae, Eucalyptus, Euschistus servus, Isaria fumosorosea, Melanocallis caryaefoliae, alternative farming, insect control, insect pests, microbial insecticides, mortality, pecans, plant extracts, synergism
Key pecan insect pests include the pecan weevil, Curculio caryae, black pecan aphid, Melanocallis caryaefoliae, and stink bugs. Alternative control tactics are needed for management of these pests in organic and conventional systems. Our objective was to evaluate the efficacy of several alternative insecticides including three plant extracts, MBI205 (from eucalyptus), Vintre® and ORSA-003 (both from citrus), and two microbial insecticides Grandevo (based on Chromobacterium subtsugae) and Isaria fumosorosea. In the laboratory, eucalyptus extract, Vintre, ORSA-003, and C. subtsugae caused M. caryaefoliae mortality. In field tests, combined applications of I. fumosorosea with eucalyptus extract were synergistic and caused up to 82% mortality in M. caryaefoliae. Also in field tests, C. subtsugae reduced C. caryae damage by 55% within the first 3 d, and caused 74.5% corrected mortality within 7 d post-treatment. In the laboratory, C. subtsugae and eucalyptus extract did not cause mortality in the brown stink bug, Euschistus servus. Applications of C. subtsugae for suppression of C. caryae, and eucalyptus extract plus I. fumosorosea for control of M. caryaefoliae show promise as alternative insecticides and should be evaluated further.