Kan suksa sahet khong khwamtanthan khong phankhao to nonko thaeplai simuang Chilo polychrysus (Meyrick).
1984
Sompong Pongprasert
Nine reported resistant varieties, W1263, MTU15, Jayanti, IR36, IR44, IR50, IR9828-23-1, IR13429-57-1 and IR19362-183 and one susceptible variety, RD7, were studied under greenhouse conditions at the Rice Research Institute, Bangkhen, and under field conditions at the Pathumthani Rice Research Center. Larvae of Chilo polychrysus (Meyrick) showed a distinct preference for feeding on the susceptible variety and egg-masses were also more concentrated on this variety. In general there was a close correlation between the number of egg-masses on a variety and the percentage of deadhearts. Both larval survival and larval weight were adversely affected on the resistant varieties. Resistant varieties, in addition to having a higher number of healthy tillers, also had a greater ability to replace damaged tillers, relative to the susceptible variety. The study indicated that the mechanisms of resistance of rice varieties to the dark-headed stem borer were, non-preference for feeding and oviposition, antibiosis and, tolerance to heavy infestation.
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