Varietal resistance to rice hispa
1987
Haque, M.E. | Durbey, S.L. | Singh, B.N. (Rajendra Agricultural Univ., Pusa, Samastipur, Bihar (India))
Rice hispa, Dicladispa armigera Oliv. is becoming increasingly important in many Asian countries. Pest attack was severe in Madhubani, Darbhanga, and Samastipur districts of Bihar, India, during the 1983 and 1984 wet seasons (WS). Ten elite lines were screened in iron tray covered with cages in Pusa in 1984 WS. The lines were randomized and replicated three times. One hundred hispa adults, collected from the field were released when the plants were 15 d old (4-leaf stage). Percentage of damaged leaves, number of eggs laid, number of grubs, and grub survival percentage were recorded on 10 plants taken randomly in each replication. Type 3, a scented rice variety from Uttar Pradesh, was least preferred by the insect. The resistance mechanism seems to be both non-preference and antibiosis. Other lines including TCA4, IET263, and Rahendra Shan 201 were highly susceptible.
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