Abstract
The relative impact of resistance mechanisms such as antixenosis (host preference) and antibiosis (population build-up, growth index and feeding rate) against the brown planthopper, Nilaparvata lugens Stål, was studied in rice varieties with different levels of resistance under laboratory conditions. The highly resistant PTB 33 was less preferred for settling and oviposition and recorded a lower percentage of insects settled and fewer eggs laid, than were observed on TN 1. Antibiosis in PTB 33 and IR 64, the highly resistant and resistant rice varieties, was expressed as a low population build-up, increased nymphal duration, decreased nymphal survival, high growth index and decreased feeding rate, while the reverse condition was noticed on susceptible TN 1.
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