Relative abundance of major insect pests and natural enemies in high yielding rice varieties of Assam (original) (raw)

Abstract

The relative abundance of major insect pests and natural enemies were studied at three different growth stages in seven high yielding varieties, Ranjit, Ranjit Sub-1, Bahadur, Bahadur Sub-1, Gitesh, Swarna Sub-1 and Shraboni in kharif and rabi season at Titabar, Assam during 2020–2022. White stem borer (47.49%) was the most predominantly abundant species followed by yellow stem borer (41.97%) among seven major insect pest species e.g., leaf folder, gall midge, caseworm, whorl maggot and gundhi bug in kharif season. But, yellow stem borer (48.69%) was abundantly observed followed by white stem borer (40.63%) among all major insect pests during rabi season. Both the species of stem borer gradually increased and reached peak due to availability of enough food at reproductive stage and decreased in the ripening stage in both the season comparatively higher in rabi season Leaf folder was the most abundant leaf feeder and its population abundance was higher in Shraboni (9.89%) followed by...

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