author(s)
DK Saikia and RN Borkakati

abstract
Field experiments was conducted during 2014-15, 2015-16 and 2016-17 to study the impact of Bio-intensive IPM on the incidence of major insect pests of tomato viz., Fruit borer, Helicoverpa armigera; Whitefly, Bemisia tabaci and Thrips, Scirtothrips dorsalis. The data revealed that no significance differences was observed in reducing the larval populations of H. arimgera in between Bio-intensive Integrated Pest Management or BIPM (2.23/plant) and chemical control (3.02/plant) plot during 2015-16, whereas the mean population of insect was only 2.32/plant at BIPM plot with a significant difference from that of chemical control plots (2.90/plant) during 2016-17. Highest number of B. tabaci was observed in untreated check i.e., 5.36, 8.11 and 4.99 per plant in comparison to BIPM (3.03, 2.67 and 2.60) and chemical control (2.58, 8.11 and 4.94) during 2014-15, 2015-16 and 2016-17, respectively. Similarly in case of S. dorsalis also the maximum number insects per plant was registered in untreated check (6.31, 7.21 and 12.16) as against the BIPM (3.23, 2.65 and 3.07) and chemical control plot(2.79, 1.92 and 4.78) during 2014-15, 2015-16 and 2016-17, respectively. In regards to the yield, highest yield of 291.8 q/ha and 242.83 q/ha was recorded in the BIPM module as against 287.0 q/ha and 234.70 q/ha in the chemical control plot. The minimum yield of 85.86, 201.5 and 196.0q/ha was registered in untreated control plot during 2014-15, 2015-16 and 2016-17, respectively. Yield result of the BIPM plot was satisfactory and it can be recommended to the farmers as a strong component of organic farming.