Environmental Entomology (1983) 12, 959-960

Laurence D. Charlet and Christian Y. Oseto (1983)
Toxicity of insecticides on a stem weevil, Cylindrocopturus adspersus (Coleoptera: Curculionidae), and its parasitoids in sunflower
Environmental Entomology 12 (3), 959-960
Abstract: The toxicity of nine insecticides to a stem weevil, Cylindrocopturus adspersus (Le Conte), was evaluated in the field to determine differential susceptibility between the pest and its natural enemies. Significant differences were found in the toxicity of six chemicals to C. adspersus, with the organophosphates performing better as a group than the carbamates. The most effective materials were carbofuran and fenitrothion. Inconsistent results were evident in the comparison of parasitization rates, with two chemicals having a higher percent parasitism than the control. The materials that were most toxic to the stem weevil larvae were also the most toxic to the natural enemies. Weevil larvae in carbofuran-treated stems had the lowest percent parasitization. The effect of insecticides on nontarget organisms needs to be considered in the development of management strategies.
(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
biocontrol - natural enemies
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.
	Cylindrocopturus adspersus	Sunflower (Helianthus annuus)	U.S.A. (mid N)
Nealiolus curculionis (parasitoid)	Cylindrocopturus adspersus	Sunflower (Helianthus annuus)	U.S.A. (mid N)
Quadrastichus ainsliei (parasitoid)	Cylindrocopturus adspersus	Sunflower (Helianthus annuus)	U.S.A. (mid N)