Department of Agricultural Entomology, North Bengal Campus, Bidhan Chandra Krishi Viswavidyalaya, Pundibari-736165, Cooch Behar, West Bengal, (India).
1Research Fellow, Department of Agricultural Entomology, North Bengal Campus, Bidhan Chandra Krishi Viswavidyalaya.
The incidence of yellow mite (Polyphagotarsonemus latus Banks) on different varieties of jute, sown at different dates during crop growing season revealed that the mite population was higher on early sown crop but decreased gradually with delay in sowings. Mite population was 49.75, 38.06 and 21.25 mites/5 leaves on crops sown on 2nd and 4th week of April and 2nd week of May, respectively. Among the two species of jute studied, population was always higher on the varieties of Olitorius as compared to Capsularis. Among the six varieties evaluated (JRC 212, JRC 7447 and JRC 321 of Capsularis and JRO 7835, JRO 632 and JRO 524 of Olitorius), JRO 7835 was found most susceptible (64.97 mites/5 leaves) and JRC 321 was least susceptible (16.39 mites/5 leaves). Peak population of mite was observed during 3rd week of June irrespective of varieties and date of sowing. No relation has been found between building up of population and age of the crop; rather it was dependent upon the prevailing weather conditions.
