Population Fluctuation of Aphid, Aphis gossypii and Predatory Coccinellid Beetle on Brinjal Aphid with Reference to its Relation with Weather Factors in Western Plain Zone of Uttar Pradesh

A study to asses the population fluctuation of aphid, Aphis gossypii and predatory coccinellid beetle with reference to its relation with weather factors on brinjal at S.V.P. Uni. of Agric. & Tech., Meerut, U.P. during 2005–06 and 2006–07. The maximum population 356.0 aphids/3 leaves in 42^nd SW during 2005–06 and 407.18 aphids/3 leaves in 45^th SW during 2006–07 were recorded, respectively. The sunshine hours showed significant positive correlation with aphid population while, RH showed negative correlation during first year. However, next year all the weather parameters showed non-significant negative correlation. The highest population of Coainella septempunctata was recorded 3.7 beetles/plant during 47^th SW in 2005–06 and 3.4 beetles/plant during 2006–07 in 46^th SW. The average RH showed negative correlation, while sunshine hours showed positive correlation with Coccinella population. Another coccinellid beetle, Coainella sexmaculata population was recorded highest in 45^th SW (4.2 beetles/plant) in 2005–06 and 46^th SW during 2006–07. Minimum temperature and average RH showed negative correlation while sunshine hours showed positive correlation with Coainella sexmaculata population.