New Insecticides for Asiatic Rice Borer Control in Paddy Rice

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Two formamidines, C-8514 (N′(4-chloro-o-tolyl)-N,N-dimethylformamidine) and its desmethyl analogue C-8520 (N′(4-chloro-o-tolyl)-N-methylformamidine), a new thiourea C-9140 (N′(4-chloro-o-tolyl)-N,N-dimethylthiourea), and diazinon were tested for activity against Chilo suppressalis (walker) in rice. C-8514 formulated as a 3% dust showed good efficacy on Young hatching larvae of C.suppressalis. First stadial larvae moving over a dusted leaf surface were killed without exception. Larvae already established in the stems were controlled to a large extent by the same treatment, The ovicidal effect of C-8514 dust was good, with mature eggs being more sensitive than newly deposited ones.

Neither hatching larvae nor 2nd-stadial larvae established in the stems of paddy plants were controlled by a hypothetical vapor phase from the paddy water. This was shown by separating the rice paddy from the water containing the active ingredient

First-stadial larvae were well controlled by the granulated materials. This was shown with all insecticides applied to the paddy water. The formamidines C-8514 and C-8520 demonstrated good borer control at all in festation dates. There was activity up to 26 days after granular treatment in the rice plants. C-9140 had an even better residual activity with a slightly slower effect. Diazinon showed a contrasting behavior with good initial activity but its residual action failed between 18 and 26 days after granular treatment, Similar results were obtained when testing 2nd stadial larvae in 1/4-m2 paddy containers. Evidence is discussed pointing to C-8520 as the major component in rice plants which kills rice borers.

Document Type: Research Article

Publication date: October 15, 1971

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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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