Effect of Weather and Date of Transplanting on Caseworm (Nymphula depunctalis) Incidence (original) (raw)

International Journal of Current Microbiology and Applied Sciences, 2021

Abstract

The rice caseworm, Nymphula depunctalis (Guenee) (pyralidae: Lepidoptera) is a serious pest of rice in Assam particularly in Sali season (monsoon crop:transplanted lowland rainfed rice and deep-water rice). N. depunctalis is widely distributed in rice growing counties of Asia, Australia, America and Africa (Dale, 1994).The pest occurs in the fields with prolonged standing water in the vegetative stage of the rice plant (Pathak and Khan, 1994). Larvae of N. depunctalis are semi-aquatic in nature which requires standing water. Due to continuous rainfall and water stagnation in thefield of winter rice, infestation of N. depunctalis increased in a high rate during vegetative stage of the crop. In heavily infested area, entire crop may have to be resown or replanted (Srivastava, International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 10 Number 02 (2021) Journal homepage: http://www.ijcmas.com

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