POPULATION DYNAMICS OF SUCKING PESTS AND THEIR CORRELATION WITH WEATHER PARAMETERS IN GREENGRAM, Vigna radiata L. CROP

摘要

Results revealed that the incidence of jassid (Amrascaa tern Pruthi) and whitefly (Bemisia tabaci Genn.) were appeared on the greengram crop from the 1st week of March with 0.8 jassid nymph/leaf and 1.20 whitefly/plant, respectively, while thrips, (Megaleurothrips distalis Karny) and Spotted pod borer, (Maruca testulalis Geyer) observed first time (4.60 nymph/flower and 0.5 larva/plant) during 4th week of March. The highest population of jassid (5.80 nymphs/leaf), whitefly (6.80 whitefly/leaf) and thrips (9.40 thrips/flower) was attained during 4th week of April, while peak of spotted pod borer (1.40 larva/plant) was observed during 1st week of April. The correlation studies indicated that population of jassid exhibited significant positive correlation with maximum temperature and significant negative correlation with morning relative humidity and mean of relative humidity. A population of whitefly favours the significant positive correlation with maximum temperature and mean of bright sunshine hours. Correlation studies indicated that thrips exhibited a significant positive correlation with maximum temperature and significant negative correlation with morning relative humidity. In case of spotted pod borer, there was abiotic factors did not givesignificant effect on the larval population of this pest.