National Academy of Agricultural Sciences (NAAS)
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PRINT ISSN : 2319-7692 Online ISSN : 2319-7706 Issues : 12 per year Publisher : Excellent Publishers Email : editorijcmas@gmail.com / submit@ijcmas.com Editor-in-chief: Dr.M.Prakash Index Copernicus ICV 2018: 95.39 NAAS RATING 2020: 5.38 |
Field experiment were carried out in the Experimental Farm, Department of Horticulture, Assam Agricultural University, Jorhat during rabi2017-18 and 2018-19 to study the diversity of insect pests and predators of cabbage ecosystem in different phonological stages of cabbage. Major insect pests recorded during both the crop season from 20 DAP, were cabbage aphid, Brevicoryne brassicae (L.), diamondback moth, Plutella xylostella (L.), cabbage butterfly, Pieris canidia (L.), cutworm, Agrotis ipsilon (Hfn.), cabbage looper Trichoplusiani (Hubner) and flea beetle, Monolepta signata Oliv with minor pests viz., sawfly, Athalia proxima, cabbage head borer, Hellulaundalis (L.), handmaiden moth, Syntomoides imaon (L.), epilachna beetle, Epilachna spp. (L.) and green stink bug, Nezara viridula (L) were also persisted on the crop right from the seedling stage to harvesting of the crop. Six numbers of predators viz., Coccinella transversalis (F.), Maenochilus sexmaculatus C. Septem punctata (L.), Micraspis discolor (F), Harmonia dimidiata (F), Episyrphus belteotus (L.) and one number of predatory spider, Oxyopes spp. were recorded from cabbage ecosystem.The diversity study of insect pests as well as predatorsin different phonological stages of cabbage indicated highest species diversity and evenness during the pre -heading stage of cabbage followed by heading stage whereas, highest species richness was recorded during seedling stage for both the varieties during 2017-18 and 2018-19.
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