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