2. Institutional Publications

Permanent URI for this communityhttp://localhost:4000/handle/123456789/96

Browse

Filters

1999 - 20002

Settings

Author: search.filters.author.Hebsy Bai

Search Results

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    Yellow oleander (Thevetia neriifolia juss.) a bio-antifeedant for epilachna beetle (Henosepilachna vigintioctopunctata L.)
    (Kerala Agricultural University, 1999) Hebsy Bai; George Koshy
    Fresh and dried leaves and seeds of Thevetia neriifolia Juss. were evaluated for their antifeedant activity against Henosepilachna vigintioctopunctata L. using acetone, benzene, ethanol, hexane, methanol and water as extractants. Based on the percentage of leaf protection, seed extracts were found superior to the leaf extracts. Fresh and dried leaf extracts were on par. Among the solvents, ethanol and methanol gave maximum leaf protection closely followed by water. Based on larval starvation, seed extracts were superior to leaf extracts and fresh leaf extracts were significantly better than dried leaf extracts. Soaking of oowdered plant material in solvents for 48 h and filtration was found as effective as soxhlet method for extracting antifeedant components from leaves and seeds of T. neriifolia.
  • No Thumbnail Available
    Item
    Bare-root dip of brinjal seedlings in phytochemicals for the management of root-knot nematode (Meloidogyne Incognita)
    (Kerala Agricultural University, 2000) Asha John; Hebsy Bai
    Aqueous ncem leaf extract, neem oil and marotti oil at different concentrations were tested as bare-root dip treatments for their efficacy in containing root-knot nematode [Meloidogyne incognita (Kofoid and White, 1919) Chitwood, 1949] infestation in brinjal. Root-dip in neem leaf extract for 1 h resulted in significantly better height and number of leaves in the treated plants than neem oil and marotti oil. Among the different concentrations of nccm leaf extract tested, 6.25 and 25 per cent extracts proved more effective. Significant reduction in gall index was also seen in neem leaf extract treated plants. Higher concentrations of the extract (50 and 25 per cent) significantly reduced the number of egg masses produced. But none of the phytochemicals had any adverse effect on the hatching of the egg masses. All the three phytochemicals irrespective of the doses reduced population of the nematode in the soil. An overall assessment of the result established the superiority of neem leaf extract (25%) among the different phytochemicals in checking nematode infestation.