Field Efficacy of botanical Insecticides against Scirpophaga incertulas Walker Infesting Paddy

This study evaluated the field efficacy of various botanical insecticides against the rice yellow stem
borer (Scirpophaga incertulas) during the 2016-2017 seasons. Results indicated that Achook
(Azadirachtin 0.03% EC) consistently demonstrated the lowest incidence of dead heart (1.91%) and
2.50%) and white ear damage (2.89% and 3.59%) consequently during both the year compared to
other insecticides and the untreated control. In both 2016 and 2017, Achook significantly reduced DH
incidence to levels statistically comparable to rynaxypyr 20 SC and dinotefuran 20 SG, outperforming
other botanicals such as Neem Baan, Neemazal, pongamia oil, and Nimbecidine. Similar trends were
observed in WE incidence, with Achook showing the lowest damage, aligning closely with the
chemical insecticides. Achook (Aza. 0.03%) provided the highest incremental grain yield (42.08 q/ha)
and net profit (Rs 26,133.2/ha), outperforming other treatments such as Rynaxypyr 20 SC and
Dinotefuran 20 SG. While Dinotefuran 20 SG showed the lowest cost of protection (Rs 994/ha) and
the highest benefit-cost ratio (24.82:1), neem-based products also demonstrated significant yield
increases over untreated plots. The pooled data over two years also revealed that all botanical
insecticides were significantly more effective in controlling DH and WE compared to untreated plots.
Overall, all botanical insecticides were significantly more effective than the untreated control plot.