Studies on Incidence of Jute Semilooper in Relation to Weather of Uttar Dinajpur, India

摘要

Background and Objective: Jute is an economically important fibre crop of India but its’ national production rate is lower than theoretical values due to attack of Jute semilooper, Anomis sabulifera Guen. Pest population in jute crop (Corchorus olitorius L.) was assessed during two consecutive year of 2015-2016 at Uttar Dinajpur, West Bengal, India (i) To define the population dynamics of jute semilooper (ii) To understand relation between that pest and climate (iii) To apply the generated information relating to jute semilooper population dynamics in integrated pest management. Materials and Methods: To achieve this objective, field observation for plant incidence, leaf incidence and visual count of the pest was conducted and their correlation with climatic parameters were statistically analyzed by one way ANOVA and KyPlot. Results: In 2015 the population was initiated at about 22 Standard Meteorological Weeks (SMW) and attained the maximum at about 28 SMW. The pest incidence then decreases slowly with time and it maintained a lofty abundance up to crop harvesting. In 2016, the population dynamics was quite different with changing weather. Grossly abiotic conditions such as temperature, relative moisture and rainfall showed a key role in incidence of Anomis sabulifera. Conclusion: It was concluded that, the provided data on insect pest incidence give better understanding in effect of weather on seasonality of the pest. That indulgent will be very helpful to construct an appropriate strategy in pest management for sustainable agriculture.