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Distribution of Imidacloprid Residues in Different Parts of Rice Plants and Its Effect on Larvae and Adult Females of Chilo suppressalis (Lepidoptera: Pyralidae)

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Abstract:

The distribution of imidacloprid residue in different parts of rice, Oryza sativa L. (Graminales: Poaceae), plants was investigated for three rice varieties. Changes in larval hormones in Chilo suppressalis (Walker) (Lepidoptera: Pyralidae) that fed on imidacloprid-treated plant sources and the fecundity of resultant adult females (moths) also were determined. No significant differences in imidacloprid residue were detected in rice stem, leaves, and the unexpanded new leaf 7 d after treatment except in the rice variety Fengyouxiangzhan, in which residue content in leaves and the unexpanded new leaf was significantly lower than that in the stem. The percentage of reduction of imidacloprid residue after treatment varied with rice variety and plant parts. The greatest reduction in the three plant parts was shown in Wujing 15 compared with the other two varieties. The decomposition rate of imidacloprid residue in Wujing 15 was greater in leaves and unexpanded new leaf than in the stem, whereas in Wuyunjing 7 it was lower in leaves than in the unexpanded new leaf and stem. In Fengyouxiangzhan, the decomposition rate of imidacloprid in the stem increased 14 d after treatment. Juvenile hormone III and molting hormone titers in fourth instar larvae that had fed on rice plants treated with imidacloprid since the neonate stage were significantly higher than those in larvae fed on untreated plants (control). Juvenile hormone titer in larvae that had fed on Zizamia lalifolia Turcz galls treated with imidacloprid and the fecundity of the female moths that developed from such larvae were also significantly higher than that on the control counterparts. These results are discussed in relation to the impact of imidacloprid on nontarget insects and pest management.

Keywords: Chilo suppressalis; imidacloprid; juvenile hormone III; molting hormone; rice plant

Document Type: Research Article

Publication date: April 1, 2007

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  • Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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