Toxicity and effect of chlorfluazuron (IGR) against common cutworm, Spodoptera litura (F.) (Lepidoptera: Noctuidae)
2011
Perveen, F. (Hazara Univ., Mansehra (Pakistan). Dept. of Zoology) | Yasmin, N. (Karachi Univ. (Pakistan). Dept. of Zoology) | Naqvi, S.N.H. (Karachi Univ. (Pakistan). Dept. of Zoology)
The present research aimed to determine the toxicity and effects of sublethal doses of chlorfluazuron on reproductive and other developmental parameters of the common cutworm, Spodoptera litura (F.) (Lepidoptera: Noctuidae). The treatments were carried out under laboratory conditions at newly ecdysed fifth instar larvae and pupae. The results indicated that the values of LD50 and LD95 of the newly pupae were higher than that of the newly ecdysed fifth instars. When LD10 (1.00 ng/larva; 0.12 ng/female pupa; 1.23 ng/male pupa) was applied to females or males or both sexes, it was observed that the fecundity in the resulting mated adults was reduced from 24-41%. The fertility was reduced to 46-49% when females were treated, 61-65% when males were treated, and 65-68% when both sexes were treated. The hatchability was reduced to 31-34% when females were treated, 48-51% when males were treated, and 51-52% when both sexes were treated. However, there were no significant differences were observed between larval and pupal treatment in the reduction of these biological parameters. Similarly, the duration of larval and pupal stages, the life spans of adults male and female, and the number of mating per pair were not affected by the larval or pupal treatment.
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