DETERMINATION OF PESTICIDE EFFICACY AGAINST FIELD POPULATIONS OF EUROPEAN RED MITE, PANONYCHUS ULMI KOCH

摘要

Field collected populations of European red mite, Panonychus ulmi Koch, were collected from different locations of Kashmir valley to ascertain the effect of various pesticides during 2007 and 2008. For fenazaquin, the highest LC_(50) value of 0.0041 per cent and resistance factor of 6.54 were recorded in Mattan, while the lowest LC_(50) value of 0.0013 per cent and resistance factor of 2.07 were recorded in Awantipora. The LC_(50)of the susceptible population was worked out to be 0.0006277 per cent.In case of dimethoate the highest LC_(50) value of 0.029 per cent and resistance factor of 11.47 were observed in Kunil while the lowest LC_(50) value of 0.014 per cent and resistance factor of 5.54 were observed in Wagoora and Kellam, respectively, where as the LC_(50) value of the susceptible population was recorded to be 0.0025 per cent. Similarly for endosulfan, the highest LC_(50) value of 0.061 per cent and resistance factor of 2.45 were observed in Mattan and Wagoora, respectively. However, the lowest LC_(50) value of 0.032 per cent and resistance factor of 1.29 were observed in Kunil. The LC_(50)of the susceptible population was worked out to be 0.0248 per cent. For chlorpyriphos, the highest LC_(50) value of 0.0164 per cent and resistance factor of 2.43 were recorded in Zakura. Whereas the lowest LC_(50) value of 0.008 per cent and resistance factor of 1.19 were obtained in Bonkoot and Malangpora, respectively. Similarly, LCsoof the susceptible population was recorded as 0.006728 per cent. However, in case of ethion the highest LC_(50) value of 0.057 per cent and resistance factor of 2.83 were obtained in Zakura whereas, the lowest LC_(50) value of 0.028 per cent and resistance of 1.41 were recorded in Malangpora and the LC_(50)of the susceptible population was worked out to be 0.02016 per cent.