Exogenous silicon through the basal field application of diatomaceous earth at 50, 100, 200, 300, 400 and 500 kg ha^-1 exhibited a promising result in enhancing plant resistance to rice stem borer. A maximum of 69.8 and 67.2% decline in borer damage were recorded at vegetative and reproductive stages, respectively with 300 kg ha^-1 dose as against 43 and 76% decline in standard check, calcium silicate at 2000 kg ha^-1. This enhanced resistance was primarily attributed to a higher silicon deposit of 13 g kg^-1 dry plant sample compared to 4.3 g kg^-1 in untreated check resulting in 52% gain in yield. At higher doses, however, the product showed breaking down of resistance against the borers.