Growth responses of larvae of the rice stem borer to rice plants treated with 2,4-d
1963
ISHII, SHOZIRO | HIRANO, CHISATO
Growth response of rice stem borer larvae to rice plants treated with 2,4-D was investigated. In greenhouse rearing experiments, growth of the larvae was improved when they fed on 2,4-D treated plants. In aseptic rearing experiments, the larvae also grew better on stems of rice plants treated during growth with 2,4-D than on untreated stems. On the other hand, larval growth was not improved by addition of 2,4-D to a diet of sterilized rice stems. The nitrogen content of the 2,4-D treated plant is higher than that of the untreated plant. Because of the importance of nitrogenous compounds for larval growth, the improved growth on 2,4-D treated plants was apparently caused by the increased nitrogen content of the plants, and not as a direct effect of 2,4-D itself. Apparently the increased infestation of rice stem borer larvae on rice plants treated with 2,4-D arises because of the ability of such plants to support good larval growth.
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