Bioefficacy of different organic/biopesticide treatments against tomato fruit borer (Helicoverpa armigera Hubner) under field conditions

Abstract

Studies on the bioefficacy of organic/biopesticides viz. agneyastra, cow urine, eupatorium leaves extract in cow urine, Eupatorium SFE, HaNPV, melia drupes extract in cow urine, Melia SFE, Neemarin 300 and panchagavya against Helicoverpa armigera (Hub.) in tomato crop. The maximum incidence of neonate larvae of H. armigera was recorded in first week of May (0.92 larvae/plant) with 83.33 per cent per plant infestation.The correlation coefficient (r) for rainfall and RH I&II was negative and significant. The r value for maximum and minimum temperature was positive but non-significant. Field efficacy study revealed that out of nine treatments, Neemarin 300 (0.3%) was found most effective in reducing the larval population of H. armigera (96.30%) while cow urine (10%) was less effective (42.42%) on 7th day after treatment.