Thumbnail Image

University of Agricultural Sciences, Bengaluru

University of Agricultural Sciences Bangalore, a premier institution of agricultural education and research in the country, began as a small agricultural research farm in 1899 on 30 acres of land donated by Her Excellency Maharani Kempa Nanjammanni Vani Vilasa Sannidhiyavaru, the Regent of Mysore and appointed Dr. Lehmann, German Scientist to initiate research on soil crop response with a Laboratory in the Directorate of Agriculture. Later under the initiative of the Dewan of Mysore Sir M. Vishweshwaraiah, the Mysore Agriculture Residential School was established in 1913 at Hebbal which offered Licentiate in Agriculture and later offered a diploma programme in agriculture during 1920. The School was upgraded to Agriculture Collegein 1946 which offered four year degree programs in Agriculture. The Government of Mysore headed by Sri. S. Nijalingappa, the then Chief Minister, established the University of Agricultural Sciences on the pattern of Land Grant College system of USA and the University of Agricultural Sciences Act No. 22 was passed in Legislative Assembly in 1963. Dr. Zakir Hussain, the Vice President of India inaugurated the University on 21st August 1964.

Browse

19981
Reset filters
Subject: Plant Pathology × Author: AMARESH, Y. S. × Start date: 1961 × Type: Thesis × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    ThesisItemOpen Access
    STUDIES ON FOLIAR DISEASES OF SUNFLOWER (Helianthus annuus L.) WITH SPECIAL REFERENCE TO ALTERNARIA LEAF BLIGHT CAUSED BY Alternaria helianthi (Hansf.) Tubaki and Nishihara
    (UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE, 1998-08-19) AMARESH, Y. S.; NARGUND, V.B.
    Among the several diseases affecting sunflower crop, foliar diseases contributed more loss in yield. These include Alternaria leaf blight caused by Alternaria helianthi (Hansf.) Tubaki and Nishihara and rust caused by Puccinia helianthi Schw. Survey on incidence of Alternaria leaf blight and rust revealed that Alternaria leaf blight was more severe in Kharif and rabi seasons, while rust was less severe during 1996-97. Survival oi A.helianthi in infected stalks was more than 360 days in the laboratory conditions, while under natural conditions its survival was upto 240 days. The safflower was found to be collateral host for A. helianthi. The culture filtrate of A. helianthi showed the wilting symptoms within 24 hr. on tomato and sunflower seedlings and also inhibited the germination of both sunflower and sorghum seeds. Further, the culture filtrate inhibited root and shoot elongation of sunflower and sorghum. Toxin was partially purified. It was host specific and thermostable, produced typical symptoms on sunflower leaves without yellow halo. Among the 110 sunflower genotypes screened only three genotypes viz HPM-15R HPM-116 and HPM-140 were found resistant to both Alternaria leaf blight and rust. In case of m vitro evaluation of fungitoxicants mancozeb (0.3%), cyproconazole (0.1 %) were most effective in inhibiting mycelial growth and also per cent inhibition of spore germination of A. helianthi. Plant extracts were not effective. For rust tridemorph (1000 ppm) and cyproconazole (1000 ppm) were most effective in inhibiting uredospore germination of P.helianthi. In field evaluation of fungicides and plant extracts, chlorothalonil (0.2%), cyproconazole (0.1%) and mancozeb (0.2%) gave the best control of Alternaria leaf blight and rust resulting into increased seed and oil yield.