Studies on the Varietal Resistance of Rice to the Zigzag-Striped Leafhopper, Recilia (Inazuma) dorsalis Motschulsky(II)

Experiment was conducted to study resistance of rice varieties and lines originated from Korea and IRRI sources to the zigzag-striped leafhopper, Recilia (Inazuma) dorsalis MOTSCHULSKY The nature of varietal resistance to the insect was evaluated from the viewpoints of feeding and ovipositional preferences and antibiosis. The varieties Su-Yai-20, Muthumanikam, PTB-18 and Vellanlangalayan were resistant and DV-139 moderately resistant to tile zigzag-striped leafhopper, and the other varieties tested were susceptible. Feeding and ovipositional preferences were significantly different among the varieties, but no correlation was observed between the two preferences. The nature of resistance of rice to the insect seemed to be related with The non-feeding preference, not non-ovipositional preference. The resistant (Vellanlangalyan and Su-Yai 20) and moderately resistant(DV-139) varieties had high antibiosis against the zigzag-striped leafhopper.