author(s)
Gajendra Singh, DV Singh, Gaje Singh, Hem Singh, Prashant Mishra and Arvind Kumar

abstract
A field study was conducted to evaluate the safety of insecticides against natural enemies’ spiders in brinjal ecosystem. The field trial was conducted at Old campus Sardar Vallabhbhai Patel University of Agriculture & Technology, Meerut during the Zaid season of 2019 & 2020. The crop brinjal variety Pusa Purple long was grown in a randomized block design with nine treatments viz., spinosad 45 EC @ 0.30 ml per liter of water Emamectin benzoate 5% SG @ 0.5 gm per liter of water, Indoxacarb 14.5 SC @ 1.0 ml per liter of water, Profenophos 50EC @ 2.0 ml per liter of water, Lambda cyhalothrin @ 1.0 ml per liter of water, Quinalphos 20 EC @ 2.0 ml per liter, Bacillus thuringiensis @ 2 gm per liter of water, neem oil (1500ppm) @ 5 ml per liter of water and untreated control, replicated thrice. Plot size was 5 x 4 m2 with spacing of 60 cm x 60 cm row to row and plant to plant, respectively. The natural enemies population of spiders was count on five randomly selected plants in each plot 10-day- intervals starting from 21 DAT. The natural enemies count was taken in all treatments. The population count of spiders was recorded on five randomly selected plants /plot. Pre- spray count was made a day before spraying and post spray counts were made at 7and 14 days after each insecticidal application. The maximum population of spiders with After seven and fourteen days of second spray, among all the treatments the maximum pooled population of spiders was recorded in untreated control with 2.00 and 3.83 spiders per five plants and followed by Bacillus thuringiensis @ 2.0 gm per liter of water, neem oil (1500 ppm) @ 5.0 ml per litre of water, Emamectin benzoate 5% SG @ 0.5 gm per liter of water, Indoxacarb 14.5 SC@ 1.0 ml per liter of water, spinosad 45% SC @ 0.3 ml per liter of water, Profenophos 50EC @ 2.0ml per liter of water, Lambda- cyhalothrin @ 1.0 per liter of water and Quinalphos 20EC @ 2.0 ml per of water plants, respectively. The most harmful treatment was Quinalphos 20EC @ 2.0 ml per of water with spiders population of 2.67, 2.33, 2.17, 1.83, 1.67 0.67, 0.33 and 0.50 spiders per five plants, respectively. After seven days of spray the minimum population of spiders was found in treatment Quinalphos 20EC @ 2.0 ml per of water plants water with 0.50 spiders per five plants. the maximum adults population of spiders was recorded with Bacillus thuringiensis @ 2.0 gm per liter of water, neem oil (1500 ppm) @ 5.0 ml per litre of water, Emamectin benzoate 5% SG @ 0.5 gm per liter of water, Indoxacarb 14.5 SC@ 1.0 ml per liter of water, spinosad 45% SC @ 0.3 ml per liter of water, Profenophos 50EC @ 2.0ml per liter of water, Lambda- cyhalothrin @ 1.0 per liter of water and Quinalphos 20EC @ 2.0 ml per of water plants, respectively. The lowest population was recorded in the treatment Quinalphos 20EC @ 2.0 ml per of water. The treatments, Bacillus thuringiensis @ 2.0 gm per liter of water and neem oil (1500 ppm) @ 5.00 ml per liter water were found safe against spiders population.