Abstract
The contact and oral toxicity of fielddoses of selected pesticides against the cocoon andadult stages of a hymenopterous parasitoid Diadegma semiclausum were studied using severalbioassays. Field rates of ten pesticides wereselective to the parasitoid pupae. Fresh residue(s)of cartap, chlorfenapyr, emamectin benzoate andpermethrin were highly toxic, causing 100% mortalityof adult females in every treatment. Residual effectsof these four insecticides on cabbage foliage showedthat only cartap was highly persistent. Cartapresidues caused 100% mortality for over 30 d. In thesame assay three chitin synthesis inhibitors(chlorfluazuron, flufenoxuron and teflubenzuron) andone fungicide/bactericide (copper nonylphenolsulfonate) and two bactericides (kasugamycin andoxolinic acid) were nontoxic to adults. Effects ofcontact toxicity of chitin synthesis inhibitors andfungicides/bactericides on the untreated progeny oftreated parents was also determined: there was nosignificant difference in parasitism rates betweenprogeny of treated and untreated adults. When thefield doses of these chemicals were fed orally,mortality of female parasitoids ranged from 0% to17.23%. However, oral ingestion adversely affectedthe parasitism rate (p < 0.05) in alltreatments except oxolinic acid. Selectivity oftested pesticides against D. semiclausum andintegration of compatible pesticides with thisparasitoid for IPM of cabbage are discussed.
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Haseeb, M., Amano, H. & Nemoto, H. Pesticidal effects on mortality and parasitismrates of Diadegma semiclausum, aparasitoid of the diamondback moth. BioControl 45, 165–178 (2000). https://doi.org/10.1023/A:1009930603601
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DOI: https://doi.org/10.1023/A:1009930603601