Two field trials were taken up to test the combined efficacy of PXGV with abamectin and indoxacarb against the diamondback moth Plutella xylostella (L.) on cauliflower at Irruttupalllam near Coimbatore during January-June 2001. The results revealed that the application of PXGV at 0.75 * 10 ^ 13 OB ha in conjunction with abamectin at 4.75g a.i. ha was the most effective in controlling the pest and increasing the yield of flower heads. This combination was on par with abamectin 9.5g a.i. ha in the first trial. In both the trials GV at 1.5 x 105 OB ha was the next best treatment which was comparable with GV at 0.75 x 10 OB ha+ indoxacarb 14.5g a.i ha. GV at 0.75 * 10 ^ 13 OB ha, abamectin at 4.75 g ai ha and indoxacarb at 14.5 g ai ha were ineffective against P. xylostella. In the first trial Bacillus thuringiensis at 0.5 kg ha' was on par with GV at 1.5 * 10 ^ 13 OB ha', but in the second, the GV was found to be better.
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Tamil Nadu Agricultural University
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Tamil Nadu, India.
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