author(s)
Mounica Puppala, Ashwani Kumar, D Gouri Shankar and G Sahrudi

abstract
A field experiment was conducted at Crop Research Farm, Dept of Entomology, NAI, SHUATS, Prayagraj in 2019-20 Kharif season to assess the “Field efficacy of certain insecticide molecules against Stem Borer Scirpophaga incertulas (Walker) in rice at Prayagraj U.P”. The experiment was laid out in Randomized Block Design, replicated thrice and consisted of 8 treatments. The results revealed that some certain insecticide molecules applied in field for Stem borer has significant effect on Mean% Dead hearts of several spray, yield and also in economics of Basmati rice over control plot. Treatment T₅ (Chlorpyriphos @ 2.0 ml/L) performed significantly lower than the other treatments with Mean% Dead hearts after first spray (10.68) and Treatment T₄ (Monocrotophos @2ml/L) and Treatment T₆ (Spinosad @ 0.3ml/L)(11.26 and 11.84 respectively) are statistically at par with Treatment T₅ (Chlorpyriphos @ 2.0 ml/L). Treatment T₄ (Monocrotophos @2ml/L) performed significantly lower than the other treatments with Mean% White ears after second spray (9.23) and Treatment T₅ (Chlorpyriphos @ 2.0 ml/L) is statistically at par (9.77) with Treatment T₄ (Monocrotophos @2ml/L). Treatment T₄ (Monocrotophos @2ml/L) performed significantly lower than the other treatments with Mean Percentage Damage reduction of Dead hearts and White ears after (59.76%) and Treatment T₅ (Chlorpyriphos @ 2.0 ml/L) is statistically at par (59.63%) with Treatment T₄ (Monocrotophos @2ml/L) . After that Treatment T₄ (Monocrotophos @2ml/L) also performed significantly higher in yield (21.75 q/ha) and in economic (1:4.71 B:C ratio). This research depicts that use of Monocrotophos will be the best for suppressing the rice stem borer and increasing productivity of Basmati rice.