Field experiments were conducted to investigate the effects of graded levels of fly ash with SSB and FYM on the incidence of rice stem borer (Scirpophaga incertulas) (Lepidoptera: Pyralidae) in rice crop in low and high Si soils under split plot design. The graded levels of fly ash incorporated in soil at five levels (0, 25, 50, 75 and 100 t/ha) one week before crop transplantation. It was found that fly ash had significant influence on the stem borer population over the control. On an average, with respect to borer incidence, higher dose of fly ash @ 100 t ha-1 markedly decreased infestation (16.9%) while, applications at 25 and 50 t ha-1 permitted slightly more dead hearts incidence, but differed significantly from control. In main plot treatments application of SSB + FYM recorded 16.1 per cent of stem borer incidence. In interaction application of fly ash @ 100 t ha-1 with SSB + FYM reported less per cent of dead hearts. Application of fly ash @ 100 t/ha had significant effect with meagre pest incidence of 11.6 per cent. Besides application of SSB and SSB+FYM alone played a major role in maintaining ETL of stem borer. The present study implies that due to suppressive effects of Si and K present in fly ash the incidence of the rice stem borer mitigated at crop vegetative stage and the use of soil incorporation strategy can create an unfavourable condition for pests to survive.
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