Vol. 7, Issue 6 (2019)
Seasonal variation in incidence of insect pests occurring on green gram [Vigna radiata (Linn.) wilczek] in lower gangetic plains of West Bengal
Author(s): Sharmila Biswas and A Banerjee
Abstract: The experiment was conducted in the ‘A-B’ Block Farm of Bidhan Chandra Krishi Viswavidyalaya situated at Kalyani, Nadia, West Bengal during both summer and kharif seasons of 2016 with an objective to study the seasonal variation in incidence of insect pests on two varieties of green gram viz. Sonali and IPM-99-125 as well as their relationship with abiotic factors in the lower Gangetic plains of West Bengal. The results revealed Aphis craccivora, Bemisia tabaci, Megalurothrips distalis, Maruca vitrata, Helicoverpa armigera, Riptortus pedestris, Clavigralla gibbosa and Catochrysops strabo as the major pests of the crop. Bemisia population has been recorded in the vegetative stage only in both the test varieties with peaks at 5 weeks after sowing (WAS) and 4 WAS during summer and kharif season, respectively. Maximum aphid population has been recorded in 6 WAS and 7WAS during summer and kharif season, respectively. Thrips population has reached its maximum in 8 WAS during both the seasons. Highest Helicoverpa population has been recorded in 7 WAS and 6 WAS during summer and kharif season, respectively, whereas, maximum population of Maruca was recorded in 9 WAS in both the seasons. Bemisia population was significantly and positively correlated with both temperatures irrespective of varieties during both the seasons. Aphid population was significantly and positively correlated with maximum temperature and bright sunshine hour in both the varieties during summer but significantly and negatively correlated with minimum temperature during kharif. Thrips population was significantly and negatively correlated with both temperatures during summer but the correlation was significantly negative with maximum temperature during kharif, while minimum relative humidity and rainfall were significantly and positively correlated with the pest population in summer crop and maximum relative humidity was significantly and negatively correlated with the pest population in kharif crop. Helicoverpa population was significantly and negatively correlated with minimum temperature in both the varieties during kharif season only. Maruca population in both the varieties was significantly and negatively correlated with minimum temperature during kharif.
Pages: 1583-1588 | 280 Views 74 Downloads
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How to cite this article:
Sharmila Biswas, A Banerjee. Seasonal variation in incidence of insect pests occurring on green gram [Vigna radiata (Linn.) wilczek] in lower gangetic plains of West Bengal. Int J Chem Stud 2019;7(6):1583-1588.
