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Journal of Biological Sciences
Year: 2001  |  Volume: 1  |  Issue: 10  |  Page No.: 938 - 940

Effect of Nitrogen Level on the Extent of Damage of Rice Caseworm, Nymphula depunctalis Gn.

G. Das, K.S. Islam and M. Jahan    

Abstract: The effect of different levels of urea was investigated on the extent of damage of rice caseworm, Nymphula depunctalis (Gn.). Data were collected on infested hill, tiller, leaf, number of cases/m2 and position of case in leaf at different ages of the plant viz. 20, 27, 34, 41 and 48 days after transplanting (DAT). Grain yield (t ha-1) was recorded after harvesting. The infestation of N. depunctalis was significantly different in all the parameters measured except in the position of case in leaf when different levels of urea were applied. The highest infestation was observed from the plot treated with 190 kg urea ha-1 and the minimum from 130 kg. The infestation was maximum at 27 DAT which declined thereafter. The lowest yield was obtained from the plot treated with high level of urea. The implication of urea on the level of infestation of N. depunctalis is discussed.

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