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DIFLUBENZURON: DIFFERENTIAL TOXICITY TO LARVAE OF THE COLORADO POTATO BEETLE (COLEOPTERA: CHRYSOMELIDAE) AND ITS INTERNAL PARASITE, DORYPHOROPHAGA DORYPHORAE (DIPTERA: TACHINIDAE)1

Published online by Cambridge University Press:  31 May 2012

George Tamaki ,
R. L. Chauvin ,
H. R. Moffitt  and
K. D. Mantey
George Tamaki
Affiliation:
Yakima Agricultural Research Laboratory, U.S. Department of Agriculture, Yakima, Washington 98902
R. L. Chauvin
Affiliation:
Yakima Agricultural Research Laboratory, U.S. Department of Agriculture, Yakima, Washington 98902
H. R. Moffitt
Affiliation:
Yakima Agricultural Research Laboratory, U.S. Department of Agriculture, Yakima, Washington 98902
K. D. Mantey
Affiliation:
Yakima Agricultural Research Laboratory, U.S. Department of Agriculture, Yakima, Washington 98902
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Abstract

An insecticide, diflubenzuron, suppressed 3rd- and 4th-instar larvae of the Colorado potato beetle, Leptinotarsa decemlineata (Say), with reduced effect on the tachinid parasite, Doryphorophaga doryphorae (Riley), developing within the larvae. Concentrations applied to potato foliage were 50, 100, 300, and 500 mg/L. In laboratory and greenhouse tests, parasite survival was not adversely affected when the 3rd instars were treated with 50 mg/L diflubenzuron but survival decreased to 0 and 4% at 300 and 500 mg/L. Survival and emergence of the parasite from treated 4th instars were not adversely affected at any concentration tested. Fourth-instar beetle larvae were much more tolerant of diflubenzuron than were the 3rd instars. Neither fertility nor the ability to parasitize beetle larvae was adversely affected in adult parasites emerging from treated 3rd or 4th instars. Adult beetles developing from treated larvae mated normally and laid fertile eggs. Foliage consumption by the beetle larvae decreased progressively as dosage of diflubenzuron increased but only slowly once the dosage increased beyond 100 mg/L.

Résumé

L'insecticide diflubenzuron s'est avéré efficace contre les 3ième et 4ième stades du doryphore de la pomme de terre, Leptinotarsa decemlineata (Say), tout en ayant un effet mineur sur le parasite tachinidé Doryphorophaga doryphorae (Riley) se développant à l'intérieur des larves. Les concentrations appliquées sur le feuillage étaient de 50, 100, 300 et 500 mg/L. Lors de tests en laboratoire et en serre, la survie du parasite n'a pas été affectée par le traitement des 3ième stades à la concentration de 50 mg/L de diflubenzuron, mais elle a chuté à 0 et 4% avec 300 et 500 mg/L. La survie et l'émergence des individus parasitant le 4ième stade n'ont pas été affectées à aucune des concentrations testées. Les larves de 4ième stade du doryphore se sont avérées beaucoup plus tolérantes au diflubenzuron que celles de 3ième stade. La fertilité et la capacité de parasiter des larves du doryphore n'ont pas été affectées chez des parasites adultes ayant émergé des stades 3 et 4. Les adultes du doryphore obtenus de larves traitées se sont accouplés normalement et ont pondu des oeufs fertiles. La consommation de feuillage par les larves du doryphore a diminué avec l'augmentation de la dose de diflubenzuron, mais de façon moins importante aux doses supérieures à 100 mg/L.

Type
Articles
Information
The Canadian Entomologist , Volume 116 , Issue 2 , February 1984 , pp. 197 - 202
Copyright
Copyright © Entomological Society of Canada 1984

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References

Ables, J. R., West, R. P., and Shephard, M.. 1975. Response of the housefly and its parasitoids to Dimilin (TH-6040). J. econ. Ent. 68: 622–624.CrossRefGoogle ScholarPubMed
Barnes, M. M. and Moffitt, H. R.. 1963. Resistance to DDT in the adult codling moth and reference curves for Guthion and Carbaryl. J. econ. Ent. 56: 722–725.Google Scholar
Grosscurt, A. C. 1978. Diflubenzuron: Some aspects of its ovicidal and larvicidal mode of action and evaluation of its practical possibilities. Pestic. Sci. 9: 373–386.CrossRefGoogle Scholar
Harcourt, D. G. 1971. Population dynamics of Leptinotarsa decemlineata (Say) in Eastern Ontario. III Major population precesses. Can. Ent. 103: 1049–1061.CrossRefGoogle Scholar
Holst, H. 1965. Effect of the new insecticide PDD 60–40 on the fertility of Epilachna varivestis Muls. (Col. Coccinellidae) and Leptinotarsa decemlineata (Say). (Col. Chrysomelidae). Z. Pflanzenkrankh Pflazenschutz 82: 1–7.Google Scholar
Tamaki, G. and Butt, B. A.. 1978. Impact of Perillus bioculatus on the Colorado potato beetle and plant damage. Tech. Bull. U.S. Dep. Agric. 1581. 11 pp.Google Scholar
Tamaki, G., Chauvin, R. L., and Hsiao, T.. 1982. Rearing Doryphorophaga doryphorae, the tachinid parasite of the Colorado potato beetle, Leptinotarsa decemlineata. U.S. Dep. Agric. ARS-AAT-WT-21. 14 pp.Google Scholar
Tamaki, G., Chauvin, R. L., and Burditt, A. K. Jr., 1983 a. Field evaluation of Doryphorophaga doryphorae, and its host the Colorado potato beetle: (Coleoptera: Chrysomelidae). Environ. Ent. 12: 386–389.Google Scholar
Tamaki, G., Chauvin, R. L., and Burditt, A. K. Jr., 1983 b. Laboratory evaluation of Doryphorophaga doryphorae, a parasite (Diptera: Tachinidae) of the Colorado potato beetle (Coleoptera: Chrysomelidae). Environ. Ent. 12: 390–392.CrossRefGoogle Scholar