Role of silica in induction of resistance in rice to yellow stem borer, Scirpophaga incertulas (Walker) (Lepidoptera : Pyralidae)

A field experiment on the influence of silicon applied in forms of fertilizer formulations on yellow stem borer,(YSB) Scirpophaga incertulas (Walker) infesting rice was conducted at Central Research Farm, Orissa University of Agriculture and Technology, Bhubaneswar during wet season, 2014. The results of the experiment on various parameters revealed that foliar application of orthosilicic acid @ 4 ml/l (T2) at 20, 35, 50 and 65 days after transplanting (DAT) was the best treatment in reducing dead heart and white ear head incidence followed by the application of orthosilicic acid @ 2 ml/l. Both the treatments significantly reduced the feeding tunnel by YSB as compared to the other treatments. Silicon uptake by rice plants was found to be higher in orthosilicic acid @ 4ml/l followed by calcium silicate @ 1 t/ha, orthosilicic acid @ 2ml/I and calcium silicate @ 0.5 t/ha. The grain yield was highest in orthosilicic acid @ 4 ml/l (45.08 q/ha) followed by orthosilicic acid@ 2 ml/l and calcium silicate @ 1 t/ha. Foliar application of silicon in form of orthosilicic acid was found to be highly effective against yellow stem borer followed by basal application of calcium silicate, steel slag and fly ash in rice.

Author : Seema Tripathy* and LK Rath