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Sharma S.K.,Highland Agricultural Research and Extension Center | Sharma S.K.,KVK Inc
Research on Crops | Year: 2014

Field evaluation of six insecticides viz., chlorpyriphos (0.05%), imidacloprid (0.0178%), lambda cyhalothrin (0.004%), profenofos (0.05%), quinalphos (0.05%) and triazophos (0.04%) as post emergence sprays was done to control cutworm damaging potato in Lahaul valley of Himachal Pradesh during 2008 and 2009. The results indicated that all the evaluated insecticides were effective and statistically non-significant in checking cutworm infestation in potato. These insecticides increased the tuber yield by more than 90% over control with highest increase recorded in profenofos (0.05%) sprayed plots in both the years (118.1 and 123.4%, respectively). Reductions in tuber damage to the tune of 85 to 92.2% were recorded for all the insecticides. Source

Sharma S.K.,Highland Agricultural Research and Extension Center
Journal of Entomological Research | Year: 2013

Predictive regression equations between marketable yield and Pieris brassicae population at pre-treatment [pre curd initiation stage], 14 days after first (DAS1) and second (DAS2) spray [post curd initiation stage] were y = -0.336x + 22.76, y = -0.249x + 17.92, y = -0.440x + 15.05, respectively during first year and y = -0.036x + 14.00, y = -0.137x + 15.76, y = -0.331x + 15.21, respectively during second year. The corresponding coefficients of determination (R2) were 0.064, 0.981, 0.868 in 2008 and 0.014, 0.827, 0.957 in 2nd year, respectively. Similarly, regression equations between marketable yield and plant infestation were y = -0.240x + 21.08, y = -0.303x + 22.83 at pre-treatment; y = -0.142x + 16.05, y = -0.202x + 16.37 at 14 DAS1 and y = -0.346x + 15.31, y = -0.350x + 15.36 at 14 DAS2 in two years, respectively. The related R2 values were 0.069, 0.109 (pre-treatment); 0.883, 0.972 (14 DAS1) and 0.860, 0.944 (14 DAS2) in the respective two years. Insecticide sprays at post curd initiation stages of crop growth should be followed in highlands of Himachal Pradesh. Source

Sharma S.K.,Highland Agricultural Research and Extension Center | Sharma P.C.,Highland Agricultural Research and Extension Center
Indian Journal of Agricultural Sciences | Year: 2014

Five insecticides, i.e. lambda cyhalothrin 5 EC [Bravo5000®] (0.0025%), profenofos 50 EC [Profenofos®] (0.05%), triazophos 40 EC [Hostathion®] (0.04%), imidacloprid 17.8 SL [Maharaja®] (0.0178%), dichlorvos 76 EC [Nuvan®] (0.018%) and aqueous neem seed kernel extract (5.0 ml/L) were evaluated for the management of Pieris brassicae. Experiments were conducted in randomised block design (RBD) with three replications at research farm of Highland Agricultural Research and Extension Centre, Kukumseri, Lahaul and Spiti, Himachal Pradesh during kharif 2008 and 2009. It was concluded that all the insecticides evaluated in the present studies were effective in controlling P brassicae on cauliflower and helped in increasing the marketable yield of curds by manifolds. However, lambda cyhalothrin was best in reducing the P brassicae population, whereas triazophos gave highest reduction in plant infestation by P brassicae. NSKE was least effective in curtailing P brassicae infestation. The highest mean yield (16.16 tonnes/ha) was obtained in dichlorvos sprayed plots which also proved to be the most economical insecticide having the highest BC ratio (2.51). Source

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