Field efficacy of selected insecticides against cowpea aphid, Aphis craccivora (Koch)
Soumya Patil, D Sridevi, T Ramesh Babu and B Pushpavathi
Field evaluation of new insecticide molecules for the management of Cowpea aphid and flea beetle was carried out in Student’s farm, College of Agriculture, PJTSAU, Rajendranagar, Hyderabad during 2014-2015. The study revealed that the overall efficacy in% reduction of aphid and flea beetle population over control clearly indicated that imidacloprid 17.5 SL @ 50 g a.i./ha (56.62%) and dimethoate 30 EC @ 300 g a.i./ha (55.60%) were superior than other molecules. The incremental cost: benefit ratio (ICBR) analysis of pesticidal treatments in cowpea showed that imidacloprid treated plot recorded highest average green fodder yield (10.47 t/ha) followed by dimethoate (9.73 t/ha), thiamethoxam (9.55 t/ha) and acetamiprid (9.55 t/ha). The other treatments recorded average green fodder yield of 8.81 t/ha (diafenthiuron), 8.26t/ha (spiromesifen), 8.17 t/ha (chlorfenapyr) and 7.52 t/ha (untreated control). The highest cost: benefit ratio was recorded by acetamiprid (1:1.59) followed by dimethoate (1:1.48) and imidacloprid (1:1.41). Thiamethoxam showed the next best ratio (1:1.33). Whereas, diafenthiuron, chlorfenapyr and spiromesifen had ICBR ratios of 1:1.17, 1:1.15 and 1:1.14, respectively.
Soumya Patil, D Sridevi, T Ramesh Babu, B Pushpavathi. Field efficacy of selected insecticides against cowpea aphid, Aphis craccivora (Koch). J Entomol Zool Stud 2018;6(3):668-672.