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PREVALENCE AND INTENSITY OF INSECT PESTS AND ITS SEASONAL FLUCTUATION ON SOME VEGETABLES (Pages : 1 - 5)

M.M.R. SHAH

This study was carried out at Regional Agricultural Research Station, Bangladesh Agricultural Research Institute (BARI), Rangpur and at farmers’ field surroundings five km from the RARS station in the Rabi season of 2016-17. Continuous monitoring of insect pests is essentially important to know its status on different crops (viz. vegetables, fruits, cereals etc.) subject to forecast their control measure. In this present study, in situ observation was made on some vegetables viz. eggplant, Solanum melongena L. (Solanaceae) countrybean Phaseolus vulgaris (Fabaceae), tomato Solanum lycopersicum L. (Solanaceae), field pumpkin Cucurbita pepo (Cucurbitaceae), cauliflower, Brassica oleracea (Cruciferae) and okra Abelmoschus esculentus (Malvaceae). Results revealed that all most all crops were attacked by aphid, Aphis gossypii Glover, whitefly, Bemisia tabaci, jassid, Amrasca devastans (Dist.), thrips, Thrips palmi Karny and red mite, Tetranychus urticae Koch. The highest number of aphid population was observed among the sucking insects during December-January (vegetative stage) on cauliflower (9.8 ± 0.9) and eggplant (8.2 ± 0.9). During February-March (flowering/fruiting stage), higher number of thrips and aphids were found all of the crops. At the month of April-May (maturing stage), higher number of thrips (from 2.9±0.3 to 9.5±0.8) was found all of the crops and higher number of jassid population (7.5 ± 0.5, and 5.1 ± 0.5) was found on eggplant and okra, respectively. A new insect Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) was found in tomato field and it is high intensity was observed in the month of March and April. These results provided important information about insect population dynamics with seasonal fluctuation on vegetables.Download


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