Diversity of natural enemies and efficacy of biopesticides for the management of Bemisia tabaci (Gennadius) in Bt cotton
| dc.contributor.advisor | Rabinder Kaur | |
| dc.contributor.author | Khangura, Samreet Singh | |
| dc.date.accessioned | 2018-02-09T05:20:19Z | |
| dc.date.available | 2018-02-09T05:20:19Z | |
| dc.date.issued | 2017 | |
| dc.description.abstract | The studies on "Diversity of natural enemies and efficacy of biopesticides for the management of Bemisia tabaci (Gennadius) in Bt cotton" were conducted during Kharif, 2016. The population of whitefly and its natural enemies were comparatively less in sprayed field as against unsprayed fields at Abohar and Muktsar. Among natural enemies of whitefly, Chrysoperla zastrowi sillemi, spiders and coccinnellids were observed in both sprayed and unsprayed fields. Diversity of natural enemies associated with whitefly in the cotton ecosystem was quite less without dominance of any particular specie. Under net house conditions, Neem oil 1 per cent @ 700 and 500 ml/acre (27.11 to 74.43 per cent reduction over control) was most effective in reducing number of nymphs of B. tabaci. It was followed by Metarhizium anisopliae @ 1200 g/acre (27.06 to 58.38 per cent reduction over control). Neem oil 1 per cent @ 700 and 500 ml/acre (32.00 to 67.54 per cent reduction over control) proved to be highly effective in minimising the population of whitefly adults under net house conditions, followed by M. anisopliae @ 1200 g/acre (23.71 to 51.01 per cent reduction over control). In field conditions, the order of efficacy of biopesticides in case of B. tabaci nymphs Neem oil 1 per cent @ 700 and 500 ml/acre (53.95 to 94.61 per cent reduction over control) ˃ M. anisopliae @ 1200 and 1000 g/acre (13.41 to 79.99 per cent reduction over control) ˃ Beauveria bassiana @ 1200, 1000 and 800 ml/acre (12.26 to 77.20 per cent reduction over control) and the order of efficacy of biopesticides in case of B. tabaci adults was Neem oil 1 per cent @ 700 and 500 ml/acre (53.12 to 95.05 per cent reduction over control) ˃ M. anisopliae @ 1200 g/acre (13.15 to 70.04 per cent reduction over control). It was concluded that Neem oil 1 per cent @ 700 and 500 ml/acre and fungal formulations (B. bassiana, M. anisopliae) being safer than chemical insecticides could be included in the IPM of whitefly in the Bt cotton in field condition. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810040743 | |
| dc.keywords | Bemisia tabaci, Beauveria bassiana, Bt cotton, Chrysoperla zastrowi sillemi, coccinnellids, Diversity, Metarhizium anisopliae, Neem, spiders, whitefly | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 54 | en_US |
| dc.publisher | Punjab Agricultural University, Ludhiana | en_US |
| dc.research.problem | Diversity of natural enemies and efficacy of biopesticides for the management of Bemisia tabaci (Gennadius) in Bt cotton | en_US |
| dc.sub | Entomology | en_US |
| dc.subject | null | en_US |
| dc.theme | Diversity of natural enemies and efficacy of biopesticides for the management of Bemisia tabaci (Gennadius) in Bt cotton | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | Diversity of natural enemies and efficacy of biopesticides for the management of Bemisia tabaci (Gennadius) in Bt cotton | en_US |
| dc.type | Thesis | en_US |