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SEASONAL FLUCTUATION OF INSECT PESTS OF BRINJAL AT AGRICULTURAL RESEARCH STATION, BURIRHAT, RANGPUR (Pages : 4 - 8)

M.H. RASHID, M.J. KHATUN, M.S. MAHFUZ, C.K. DASH AND M.A. HUSSAIN

The experiment was conducted at Agricultural Research Station, Burirhat, Rangpur during 2011-2012 cropping season to know the seasonal fluctuation of insect pests of brinjal. The major insect pests were found in brinjal crop viz. brinjal shoot and fruit borer (BSFB), aphid, white fly, jassid and thrips. However, the peak population of whitefly (23.6 whieflies/5 leaves) was on the third week of December. Thrips (22.67 thrips/5 cm and aphid (91.8 aphids/5 leaves) population reached peak in the last week of February, while jassid (8 jassids/5 leaves) and brinjal shoot and fruit borer (15.3 BSFB/trap) population reached peak in 2nd week of April. Average temperature recorded significant positive correlation with the population of aphid, jassid, thrips and BSFB. A significant negative relationship was noticed with population of whitefly. Average relative humidity had significant negative correlation with aphid and BSFB. A significant positive correlation was observed between rainfall and jassid and also with BSFB. Mealy bug, leaf hopper, epilachna beetle, leaf roller, red spider mite, Spodoptera litura and squash bug appeared as the minor and infrequent pests of brinjal.Download


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