Bio-efficacy of Some Newer Acaro-insecticides against Yellow Mite (Polyphagotarsonemus latus (Banks)) and Thrips (Scirtothrips dorsalis Hood) in Chilli
2015
Field experiments conducted at ICAR-Indian Institute of Vegetable Research, Varanasi during 2011–14 to evaluate the efficacy of different newer molecules against yellow mite (Polyphagotarsonemus latus Banks) and thrips (Scirtothrips dorsalis Hood) infesting chilli revealed that maximum reduction in mite population was obtained in treatment with chlorfenapyr @ 1.5 mL L⁻¹ (69.95%) followed by spiromesifen @ 0.6 mL L⁻¹ (57.43%) and fipronil @ 0.35 g L⁻¹ (57.29%). In case of thrips, maximum reduction was achieved with fipronil (75.41%) followed by spiromesifen (58.29%). Significantly higher green chilli yield (121.43 q ha⁻¹) was obtained from chlorfenapyr treated plots followed by fipronil (110.14 q ha⁻¹), spiromesifen (109.65 q ha⁻¹) and fenazaquin (108.67 q ha⁻¹) indicating superiority of these newer molecules over the conventional ones. However, the maximum cost benefit ratio was recorded in dimethoate 30 EC followed by dicofol 18.5 EC and chlorfenapyr 10 SC. Chlorfenapyr 10 SC was found to be the most effective and yielded the highest among all the treatments but showed lower C: B ratio of 1: 8.36 due to its relatively high cost.
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