Pesticide-induced mortality of natural enemies of the onion maggot,Delia antiqua [Dip.: Anthomyiidae] |
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| Authors: | R. I. Carruthers G. H. Whitfield D. L. Haynes |
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| Affiliation: | (1) Department of Entomology, Michigan State University, 48823 East Lansing, Michigan, U.S.A.;(2) Present address: Department of Entomology, Cornell University, 14853 Ithaca, New York, U.S.A.;(3) Present address: Research Branch, Canada Agriculture, Lethbridge Research Station, T1J 4B1 Lethbridge, Alberta, Canada |
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| Abstract: | ![]()
Pesticide-induced differential mortality betweenDelia antiqua(MEIGEN)and several other organisms associated with its natural control [D. platura(MEIGEN),Coenosia tigrina (F.),Entomophtora muscae (COHN), andAphaereta pallipes (SAY)] were evaluated under simulated field conditions. Direct and residual differential mortalities were described for 3 herbicides (Chloro-IPC, nitrofen, and CDAA), 3 fungicides (maneb, chlorothalonil, and copper sulfate), and 1 insecticide (malathion). The recommended field application rates of these chemicals produced high positive differential mortality levels betweenD. antiqua and some of the natural mortality agents. Chloro-IPC, a preplant and midseason herbicide, induced 100% mortality ofA. pallipes over the 3-day residual test period. Modifications in behavioral orientation and death patterns ofD. antiqua adults infected withE. muscae were also noted in malathion-treated flies such that subsequent conidial dispersal was highly restricted. Michigan Agricultural Experimental Station Journal Article Number 10133. |
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| Keywords: | Onion maggot Delia antiqua Anthomyiidae pesticide impact natural enemies herbicide insecticide |
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