Evaluation of Novel Chemical Insecticides Against Etiella zinckenella (Treitschki) and Helicoverpa armigera (Hubner) in Field Pea

Abstract

The field experiment entitled “Evaluation of novel chemical insecticides against Etiella zinckenella (Treitschke) and Helicoverpa armigera (Hubner) in field pea” was conducted in randomized block design with three replications and seven treatments during Rabi 2017 at Crop Research Centre, Sardar Vallabhbhai Patel University of Agriculture and Technology, Meerut (U.P.) 250110. During the observation the larval population recorded December to March from all control plots. The larval population of E. zinckenella reached its peak 21.67 larvae per ten plants at first week of March (9th standard week) when the maximum and minimum temperature 31.4˚C and 13.4˚C respectively, relative humidity 54.0 per cent and rainfall 0.0 mm were recorded. The correlation of E. zinckenella larval population was found positive with maximum temperature (r= 0.800) and minimum temperature (r= 0.875), and negative with relative humidity (r = -0.316), and rainfall (r = - 0.186). The observation on the population of H. armigera larvae showed its peak (18.00 larvae per ten plants) at first week of March (9th standard week). The larval population of H. armigera was found positively correlated with maximum temperature (r= 0.770) and minimum temperature (r= 0.837) and negatively correlated with relative humidity (r = -0.327), and rainfall (r = - 0.180) during crop season. Among all the six novel chemical insecticides, i.e. indoxacarb 14.5 % SC @ 1ml/lit. water, spinosad 45 % SC @ 0.5 ml/lit. water, bifenthrin 20 EC @ 1 ml/lit. water, lamda-cyhalothrin 5 EC @ 1ml/lit. water, flubendiamide 39.35 SC @ 0.16 ml/lit. water and cypermethrin 25 EC @ 2 ml/lit. water, the insecticide flubendiamide 39.35 SC @ 0.16 ml/lit. water was found best in reducing the number of E. zinckenella with 2.67 (At 7 days) and 3.00 per ten plants (At14 days) after first spray, and 1.67 (At 7 days) and 1.33per ten plants (At 14 days) after second spray, and also found effective with minimum pod infestation of 12.67 per cent. The flubendiamide 39.35 SC @ 0.16 ml/lit. water was also noticed best among all the treatments in reduction the population of H. armigera with 1.00 (At 7days) and 1.33 per ten plants (At 14 days) after first spray and 0.67 (At 7 days) and 0.33 per ten plants (At 14 days) after second spray and the maximum pod infestation reduced (8.89%) effectively . The maximum number of C. septumpunctata 5.67 (At 7 days) and 6.00 beetles per ten plants (At 14 days) after first spray, and 3.67 (At 7 days) and 6.33 beetles per ten plants (At 14 days) after second spray was recorded in treatments flubendiamide 39.35 SC @ 0.16 ml/lit. water and closely followed by spinosad 45 % SC @ 0.5 ml/lit. water. The treatment with flubendiamide 39.35 SC @ 0.16 ml/lit. water was also found best among all the treatments with the maximum grain yield (24.09 q/ha), maximum increase yield (12.87 q/ha) over control, maximum net return (Rs 43112.00/ha) and highest cost benefit ratio (1:13.38).