The persistence of phorate in the leaves of Machavaram non-pungent local variety betelvine (Piper betel L.) was prolonged; it dissipated below the detectable limit on the 30th day at 1.25 and 2.50 kg a. i./ha and on the 45th day at 3.75. 5.00, 6, 25, 7.50, 8.76 and 10. 00 kg a. i./ha. Rate of dissipation was more pronounced at the initial stages.
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