Vol. 12, Special Issue 11 (2023)

Author(s):
Pathania SS, Bano Parveena, Sofi MA, Sushil Kumar and Bismat un Nisa

Abstract:
Bioefficacy studies of test molecule Chlorpyriphos 20 EC against Woolly apple aphid (WAA) (Eriosoma lanigerum) in apple orchards were conducted during 2020 and 2021 at two different locations in district Baramulla of Jammu and Kashmir. The test molecule Chlorpyriphos 20 EC at the dosages of 0.75, 1.00, 1.25 and 1.50 mlalong with standard check Chlorpyriphos 20 EC (Trade name other than the test molecule) at 1.00 ml per litre of water were evaluated against Eriosoma lanigerum. After 21 days of spray, maximum WAA mortality as 81.43 and 80.30 percent was obtained from test insecticide Chlorpyriphos 20 EC @ 1.50 ml and 1.25 ml, respectively at location Singhpora Pattan, Baramulla; whereas, at another location Rafiabad, Baramulla, highest WAA mortality of 78.77 and 76.58 percent was recorded from test molecule Chlorpyriphos 20 EC @ 1.50 ml and 1.25 ml, respectively. At location Singhpora Pattan, Baramulla, the least mortality of parasitoid, Aphelinus mali as 17.27 and 19.25 percent was recorded from molecule Chlorpyriphos 20 EC @ 0.75 ml and 1.00 ml, respectively; whereas, highest mortality of 28.85 and 21.63 was recorded with test molecule @ 1.50 ml and 1.25 ml, respectively. Similarly, at location Rafiabad, Baramulla the least mortality of parasitoid, Aphelinus mali as 16.94 and 23.12 percent was recorded with the test molecule Chlorpyriphos 20 EC @ 0.75 ml and 1.00 ml, respectively; whereas, highest mortality of36.86 and 29.50 was recorded with test molecule @ 1.50 ml and 1.25 ml, respectively. The highest yield of apples was recorded with application of test molecule Chlorpyriphos 20 EC @ 1.50 ml at both the locations.