Thumbnail Image

Thesis

Browse

20191
Reset filters
Subject: Entomology × Author: Navjot Kaur × Start date: 2000 × Type: Thesis × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemRestricted
    Arthropods diversity under paired row direct seeded rice and management of its major insect pests with biopesticides
    (Punjab Agricultural University, Ludhiana, 2019) Navjot Kaur; Randhawa, Harpal Singh
    The present studies were conducted at Rice Research Area, Punjab Agricultural University, Ludhiana and PAU, Regional Research Station (RRS), Gurdaspur during kharif 2017 to determine arthropods diversity under paired row direct seeded rice and bio efficacy of biopesticides against major insect-pests of rice. The experiment on arthropods diversity was laid out with three dates of sowing and sprayed/unsprayed conditions. The Overall highest arthropods diversity was recorded with second date (first fortnight of June) followed by third (second fortnight of June) and first (second fortnight of May) date of sowing. The higher arthropods diversity was recorded at Gurdaspur as compared to Ludhiana. The maximum incidence of leaffolder and stem borers and population of planthoppers was observed in third (second fortnight of June) date of sowing at both the locations. The leaffolder incidence and planthoppers population was higher at Gurdaspur whereas stem borers damage was higher at Ludhiana. The experiment on bio-efficacy of biopesticides was also conducted at both the locations (Ludhiana and Gurdaspur). It was found that the biopesticides i.e. Neem baan (azadirachtin 1%) @ 3 ml/litre of water was more effective against leaffolder, stem borers and planthoppers. The Beauveria bassiana @ 10 ml/litre of water was also found effective against leaffolder and planthoppers whereas Bt (Delfin WG) @ 10 g/litre of water was effective only against stem borers. The highest cost-benefit ratio was recorded in treatment with chlorpyriphos @10 ml/litre of water followed by Neem baan @ 1 & 2 ml/litre of water. Although comparatively less cost-benefit ratio was observed with biopesticides yet these were safer to our environment and natural enemies. Therefore, it is suggested that farmers should prefer to spray biopesticides for management of insect-pests.