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Insects that cause defoliation on soybean leaves include bean leaf beetles, grasshoppers, Japanese beetles, and several kinds of caterpillars.
In general, the threshold for defoliation in soybean is when the pest insect is present and defoliation reaches 40% before R1, 15% from R1 through R5, or 25% at R6, in combination with other defoliators. Often, high levels of defoliation exist only on a few leaves of a plant, or on just a few plants. Thus, it is important to consider entire plants and prevalance of defoliation throughout a field.
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