Title: A New Insecticide, Spirotetramat 150 OD for the Management of Cotton Mealybug, Phenacoccus solani
Abstract: Studies were conducted to evaluate spirotetramat 150 OD as foliar application for its bioefficacy, persistence and median lethal concentration against cotton mealybug, Phenacoccus solani Ferris in Tamil Nadu Agricultural University, Coimbatore during 2007- 2008. Field experiments on cotton revealed that spirotetramat 150 OD at 75 g a.i./ha was highly effective in checking the population of mealybug and was on par with the standard check, imidacloprid 200 SL at 25 g a.i/ha. During the first trial, spirotetramat at the highest concentration (75 g a.i/ha) reduced the population to 9.4/plant after three rounds of spraying from an initial population of 55.2/plant. In the second trial also, there was a drastic reduction in the mealybug population from 368.0/plant to 62.8/plant after three rounds of spraying. The performance of spirotetramat in the present studies was on par with imidacloprid 200 SL at 25 g a.i/ha. The seed cotton yield was also superior in spirotetramat (75 g a.i/ha) treated plots with 18.1 and 18.5 q/ha in the first and second trials, respectively as against 9.8 and 10.7 q/ha in untreated control. With a maximum persistent toxicity index of 1519.3 spirotetramat at 75 g a.i/ha persisted for 23 days and was next only to imidacloprid 200 SL at 25 g a.i/ha (25 days).
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 1
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