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Experiments were conducted to study resistance of rice varieties originated from Korea·and IRRI-sources to the green rice leafhopper, Nephotettix cincticeps UHLER. The nature of varietal resistance to the insect was evaluated from the viewpoints of ovipositional and feeding preferences and antibiosi...

Experiments were conducted to study resistance of rice varieties originated from Korea·and IRRI-sources to the green rice leafhopper, Nephotettix cincticeps UHLER. The nature of varietal resistance to the insect was evaluated from the viewpoints of ovipositional and feeding preferences and antibiosis. A trial was also made to survey local biotypes o( the green rice leafhopper possible to show different reaction for the rice varieties. The varieties resistant to the green rice leafhopper were mostly IRRI sources such as Bir-tsan-3, MTU-15, DK-1, DV-139, H105, ASD-7, MGL-2, PTB-18, Muthumanikam, Vellanlangalayan, and the domestic commercial varieties were generally susceptible, but only the reaction of Tong-il and its lines were moderate. Ovipositional and feeding preferences were significantly different among the varieties, but no correlation was observed between the two preferences. The nature of varietal resistance to the insect seemed to be related with the feeding preference, not ovipositional preference. The green rice leafhoppers confined on the resistant varieties such as PTB-18, Muthumanikam, H105 etc. suffered higher nymphal mortality than the susceptible varieties such as T(N) 1 and Jinheung. Though the varieties Mudgo and Suweon 214 were moderately resistant and moderate in plant reaction, the insects confned on two varieties suffered relatively higher nymphal mortality. No local biotypes of green rice leafhoppers with respect to plant reaction were found.