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Journal of Eco-friendly Agriculture
Year : 2015, Volume : 10, Issue : 2
First page : ( 168) Last page : ( 171)
Print ISSN : 2229-628X. Online ISSN : 2582-2683.

Effect of abiotic factors on seasonal incidence of rice armyworm (Mythimna separata) Walker

Lal Munni1,*, Pal Bhrigunath1, Kumar Harendra2, Rai R.K1

1Chandra Shekhar Azad University of Agriculture and Technology, Kanpur-208002, Uttar Pradesh, India

2Brahmanand Mahavidyalaya College, Rath, Hamirpur-210431, Uttar Pradesh, India

*Email: mnnll058@gmail.com

Online published on 30 November, 2019.

Abstract

Field experiments were conducted at Oilseeds Research Farm, Kalyanpur, C. S. Azad University of Agriculture and Technology, Kanpur to find out effect of abiotic factors on incidence of rice armyworm during Kharif seasons 2004 and 2005. Maximum number of adult armyworm was recorded in 2nd fortnight of August and 1st fortnight of September, i.e., 22 and 29 adult moths week−1 during 2004 and 24 and 28 adult moths week−1 during 2005. At the early stages of crop the highest larval population of armyworm was recorded in the crop transplanted at 30th June. However, in advance stages, the crop transplanted at 30th July become more susceptible to the armyworm and reached at its highest in 2nd fortnight of September to 1st fortnight of October with an average of 3.89 and 4.35 larvae m−2 and 3.77 and 4.37 larvae m−2 during 2004 and 2005, respectively.

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Keywords

Armyworm, Mythimna separata, rice, abiotic factor.

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