Environmental Entomology (1982) 11, 730-732

Marion Page, Roger B. Ryan, Nancy Rappaport and Fred Schmidt (1982)
Comparative toxicity of acephate, diflubenzuron, and malathion to larvae of the larch casebearer, Coleophora laricella (Lepidoptera: Coleophoridae) and adults of its parasites, Chrysocharis laricinellae and Dicladocerus nearcticus
Environmental Entomology 11 (3), 730-732
Abstract: Fourth-instar larch casebearer, Coleophora laricella (Hübner), was significantly less susceptible to acephate and malathion than were adults of its parasites, Chrysocharis laricinellae (Ratz.) and Dicladocerus nearcticus Yoshimoto (P < 0.01). The parasites were more tolerant (P < 0.01) than the hosts to diflubenzuron. Malathion was equally toxic to both parasite species. D. nearcticus appeared to be the more tolerant of the parasites to both acephate and diflubenzuron.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
control - general
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Coleophora laricella	Larch (Larix)	U.S.A. (NW)
Chrysocharis laricinellae (parasitoid)	Coleophora laricella	Larch (Larix)	U.S.A. (NW)
Dicladocerus nearcticus (parasitoid)	Coleophora laricella	Larch (Larix)	U.S.A. (NW)