National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692
Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Studies were carried out to evaluate the impact of abiotic factors on dominant pest complex of SRI during summer season of 2014-15 and 2015-16 at Instructional Farm, Jaguli, Bidhan Chandra Krishi Viswavidyalaya (BCKV), Nadia, West Bengal. Multiple correlation and regression coefficients were also computed to establish the relationship between weather factors and dominant pest complex (weeds, insects and diseases). Both maximum and minimum temperatures and total rainfall showed a positive but non-significant correlation with grass (Echinochloa formosensis), sedge (Cyperus difformis) and broad leaf (Alternanthera philoxeroides) weed species. Highest mean per cent dead heart (8.33%) and white head (15.33%) caused by yellow stem borer were encountered at 30 DAT and 90 DAT respectively. In due course of time, temperature and minimum relative humidity positively correlated with yellow stem borer infestation in a significant fashion where the computed ‘r’ values were 0.662 and 0.773 respectively. In case of blast disease, significant positive correlation was registered with minimum relative humidity (r=0.767). However, rainfall showed non-significant (r= 0.291) but positive effect on the sporulation of blast fungus under open field condition. Thus, the salient findings of the present investigation can be a ready reckoned for the farming community in predicting the appearance of different pests where they can utilize it in sustainable management of weeds, insects and diseases culminate economic losses in SRI.
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