In-vivo and field evaluation of spinetoram 12 Sc against Exelastis atomosa on pigeonpea
Sanjeevi kumar A and N Muthukrishnan
A new biological insecticide molecule, spinetoram 12 SC was evaluated for acute toxicity on greenhouse environment reared E. atomosa population, and persistence on pigeonpea pods at laboratory conditions; and effect on E. atomosa on pigeonpea at field conditions during 2012 -2013 and 2013- 2014 seasons. Acute toxicity studies revealed that LC50`s of spinetoram on third instar larvae after 24, 48 and 72 hours after treatment were 4.88, 1.98 and 1.31 ppm respectively. In persistence studies, the spinetoram 12 SC 27 g a.i./ha, emamectin benzoate 5 SG at 11 g a.i./ha and monocrotophos 36 SL at 500 g a.i./ha had no mortality at 14 DAT. Persistence for spinetoram 12 SC 27 g a.i./ha was upto 11 DAT and 14 DAT for spinetoram 12 SC 36 and 45 g a.i./ha and spinosad 45 SC 78 g a.i./ha. Results indicated that spinetoram 12 SC was significantly effective at 36 and 45 g a.i./ha when sprayed thrice at 15 days interval and minimized the incidence of E. atomosa on pigeonpea plants.