老年熟幼虫
The larvae have the habit of aggregation with several to hundreds and transfer from the stems to the roots. The mature larvae pupate in soil around the base of stem with the depth of 10 cm and pupal stage is 31 d.
老熟幼虫在树基部周围的土壤中化蛹,化蛹深度在地下10cm左右,蛹期31d。
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