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Control Efficacy of Ethofenprox against Soybean Pod Gall Midge, Asphondylia yushimai (Diptera: Cecidomyiidae) at Different Spray Time


Control Efficacy of Ethofenprox against Soybean Pod Gall Midge, Asphondylia yushimai (Diptera: Cecidomyiidae) at Different Spray Time



The Korean Journal of Pesticide Science 18(3): 191-195



ISSN/ISBN: 1226-6183

Occurrence of soybean pod gall midge (SPGM), Asphondylia yushimai, and soybean pod damage caused by SPGM, and its control efficacy treated with ethofenprox 20EC were first observed at Miryang from 2006 to 2008 in Korea. The typical damage symptoms in soybean pod caused by SPGM were brownish coloration and malformation. By beating method occurrence of SPGM was observed from beginning bloom of soybean and its collected population increased with season until middle September. Soybean pod damage caused by SPGM was heaviest at seeding date of 10th May, followed by 11th June and 26th May. Control efficacy against SPGM sprayed with one time application of ethofenprox 20EC at different spray time in soybean reproductive stage was highest with 92.9% at R2.5, followed by 87.9% at R2 and 83.6% at R3, and was low from about 19 to 66% at other spray time. Accordingly, the most effective spray time of insecticide for control of SPGM in soybean field was found to be R2.5 which is between R2 and R3.

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Accession: 070461367

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