Comparison of a biopesticide with some synthetic pesticides against aphids in rapeseed crop.

摘要

The experiment was conducted to compare effectiveness of (BtA) Bacillus thuringiensis and Abamectin @ 1 gm/l with chlorpyrifos @ 5 ml/l, megamos @ 1.25 ml/l and trend @ 4 ml/l in controlling aphids (Lipaphis erysimi) on rapeseed (Brassica campestris) Agriculture Research Farm NWFP Agricultural University Peshawar. These compounds were first sprayed to the point of runoff when the density of the aphids reached 10 per leaf and repeated at 15 days after the first spray. There were 5 treatments along with one control and replicated 4 times. On rapeseed, after the first spray all the pesticides (being non significant from one another) resulted in significant control of aphids over the check. After the second spray chlorpyrifos, megamos and trend (being non significant from one another gave significant control over BtA). Yield of rapeseed was significantly higher in chlorpyrifos treatment with 666 kg/ha, followed by megamos 602 kg/ha and trend 541 kg/ha and lower with 513 kg/ha in BtA treatment.