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Soybean Seed Injury by the Bean Bug, Riptortus clavatus (Thunberg) (Hemiptera: Alydidae) at Reproductive Stage of Soybean (Glycine max Linnaeus)  

Jung, Jin-Kyo (National Institute of Crop Science)
Youn, Jong-Tag (National Institute of Crop Science)
Im, Dae-Joon (National Institute of Agricultural Science and Technology)
Park, Jong-Ho (National Institute of Agricultural Science and Technology)
Kim, Uk-Han (National Institute of Crop Science)
Publication Information
Korean journal of applied entomology / v.44, no.4, 2005 , pp. 299-306 More about this Journal
Abstract
Soybean seed injury was analyzed in the experiments that soybean pods were allowed to be sucked by adults of the bean bug, R. clavatus, and were picked with a specimen pin. While attack by the bean bug at podding stage of soybean caused the increase of empty pods and completely-undeveloped seeds, attack at full seed stage caused the increase of seeds wi distinct injury mark on seed-coat. The ratio of deformed seed was lower than those of injury-marked seed and undeveloped seed when attacked during all stages. In at full bloom stage hardly produced injury-marked seeds and deformed seeds. When the injured seeds were dyed with acid-fuchsine solution, stylet sheaths of R. clavatus formed on seed-coat were observed in 83% of undeveloped seeds formed under attack during podding stage and in 91% of injury-marked seeds formed during full seed stage. In pods injured with a specimen pin at full seed and full maturity stages, no healthy seeds could be obtained from the pods. And the more picked at full seed stage, the more deformed seeds were produced and the higher weight reduction of injury-marked seed occurred. However, pin-injury at full maturity stage didn't give rise to weight reduction of seeds.
Keywords
Riptortus clavatus; Soybean; Reproductive stages; Seed injury; Needling;
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