HomeInternational Rice Research Notesvol. 27 no. 1 (2002)

Performance of new plant type prototype rice lines against caseworm (Nymphula depunctalis Guenée)

D Sharma | J. Mishra | B.s. Thakur | M.p. Janoria

Discipline: Agriculture



Rice caseworrn (Nymphula depunctalis Guenée) is a major pest of lowland rice in Chhattisgarh State of India. The pest is more destructive and causes higher losses under delayed planting and waterlogged conditions. A promising new plant type breeding line, NPT 57K-70-22, developed at JNAU appeared to show a resistant reaction to this pest at Raipur. It has a much higher grain number panicle-1, lower panicle number, and greater plant height than semidwarf varieties (Kumar et al 1999). Studies were undertaken during the 1998 and 1999 wet seasons to confirm the observed high resistance of JR57K-70-22 and to evaluate two more promising NPT breeding lines along with IR36 and Mahamaya, recommended cultivars in Chhattisgarh.

The entries were transplanted in a 12-m2 plot at 20- 15- cm spacing in a randomized complete block design with four replications. The percentage of leaf area damaged by the pest in the transplanted crop was recorded on 10 randomly sampled hills 35 d after transplanting.

The percentage leaf damage data for 2 y underwent angular transformation before analysis of variance (Table 1).