Abstract
The extent of damage and yield loss due to six species of stemborers were studied on 9 (nine) rice varieties, in vegetative, reproductive and mature phases of the plant. The hybrid variety was found the most susceptible against all the borers, and local varieties were resistant. The percentage yield loss due to stemborer's infestation was found highest (27.09, 24.54, 25.32, 36.26, 17.74 and 22.19% by C. polychrysa (Meyrick), C. suppressalis (Walker), C. partellus (Swinhoe), S. incertulas (Walker), S. innotata (Walker) and S. inferens (Walker) respectively) on the variety, BR31 and lowest (11.17, 10.18, 10.54, 8.77, 8.10, and 7.07% by C. polychrysa, C. suppressalis, C. partellus, S. incertulas, S. innotata and S. inferens respectively) on the variety, Bansphul. Yield loss was found positively correlated with ‘dead heart’ and/or ‘white head’ infestations of vegetative, reproductive and mature phases of the crop.
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