Screening rice varieties for resistance to mealybug
1987
Gopalan, M. | Radja, N.C. | Balasubramanian, G. (Tamil Nadu Agricultural Univ., Coimbatore (India). Centre for Plant Protection Studies)
Seventeen varieties were evaluated for resistance to mealybug Brevennia rehi Lindinger. Experimental plots were 4 x 2 m with two seedlings/hill at 15- x 10-cm spacing with three replications. Twenty hills were selected for each entry and the number of mealybugs/tiller and percentage infested plants on 20 hills/entry were recorded at 15-d intervals beginning 15 d after transplanting. Mealybug infestation ranged from 19% to 58%. IET8616 had the fewest infested plants. AD85001 was highly susceptible. ACM10 had the highest number of mealybugs/tiller. Mealybugs/tiller and percentage infestation were positively correlated (r = 0.9786).
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