The present paper elucidates that 0.005 to 0.05 per cent of thiourea has no significant effect on the longevity of Epilachna dodecastigma. However, when the concentration was raised from 0.05 to 0.10 per cent (t = 7.72. P < o.001) and from 0 . 1 0 to 0.20 per cent (t = 1.90, P < o.zo), the longevity of the beetles was significantly reduced. Further, it has also been observed that as the concentration of thiourea increases, the number of eggs laid by the beetle decreases and complete sterility was achieved when 0.05 per cent of thiourea was applied. Therefore, 0.05 per cent of thiourea concentration is the most suitable dose for the sterilization of E. dodecastigma.
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