Studies on efficacy and residue of Chlorantraniliprole against Helicoverpa armigera(Hubner) in tomato
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Date
2019
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CCSHAU
Abstract
Field studies on efficacy and residue of chlorantraniliprole against Helicoverpa armigera (Hubner) in tomato were conducted at Research Farm, Department of Entomology, CCS Haryana Agricultural University, Hisar during Rabi 2018-19. Results showed that larval population of H. armigera remained active in field from 9th to 21st SMW and reached to maximum (5.05 larvae/ plant) during 17th SMW. Aphid incidence was started from 9th SMW (first week of March) and reached a peak population (23.26 aphids /3 leaves) during 4th week of March (12th SMW). Whitefly and leaf miner population attained a peak population during 3rd week of April (16th SMW) and 2nd week of April (15th SMW), respectively. Correlation studies larval population exhibits a significant positive correlation with maximum (r= 0.741) and minimum temperature (r= 0.667) whereas highly significant negative correlation with morning and evening relative humidity (r = -0.798, -688), respectively. Aphid population showed a highly significant negative correlation with maximum temperature, minimum temperature and wind velocity (r= -0.874, -0.924 and r= -0.735), respectively but it was highly significantly positively correlated with morning relative humidity (r=0.796) and evening relative humidity (r=0.736). While, whitefly and leaf miner showed a significant negative correlation with morning and evening relative humidity but significant positive correlation with temperature. Results on efficacy revealed that chlorantraniliprole 18.5 SC was most effective with minimum number of mean larval population which was significantly differed from all other treatment than ascending order of insecticide having larval population was indoxacarb 14.5 SC>flubendiamide 20 WG>novaluron 10 EC> lambda cyahalothrin 2.5 EC and quinalphos 25 EC. Per cent Fruit infestation data revealed that lowest fruit infestation on number basis was recorded in chlorantraniliprole 18.5 SC 11.50 per cent fruit infestation which was significantly differ from all other treatments, followed by flubendiamide 20 WG and indoxacarb 14.5 SC which recorded 14.20 and 14.75 per cent infestation, respectively. Dissipation of chlorantraniliprole in tomato fruits followed first order kinetics with half-life period of 1.57 and 1.98 days at single (30 g.a.i./ ha) and double doses (60 g.a.i./ ha) respectively. Chlorantraniliprole applied at 50% fruiting stage, residues reached to LOQ (Limit of Quantification) of 0.01 after 10th and 20th day at single (T1) and double doses (T2) respectively with no residue in soil collected at time of harvest in both doses.
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