STUDIES ON FOLIAR DISEASES OF SUNFLOWER (Helianthus annuus L.) WITH SPECIAL REFERENCE TO ALTERNARIA LEAF BLIGHT CAUSED BY Alternaria helianthi (Hansf.) Tubaki and Nishihara
| dc.contributor.advisor | NARGUND, V.B. | |
| dc.contributor.author | AMARESH, Y. S. | |
| dc.date.accessioned | 2019-10-23T11:53:05Z | |
| dc.date.available | 2019-10-23T11:53:05Z | |
| dc.date.issued | 1998-08-19 | |
| dc.description.abstract | 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. | en_US |
| dc.identifier.other | Th-4932 | |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810132691 | |
| dc.keywords | STUDIES ON FOLIAR DISEASES OF SUNFLOWER (Helianthus annuus L.) WITH SPECIAL REFERENCE | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 168 | en_US |
| dc.publisher | UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE | en_US |
| dc.sub | Plant Pathology | en_US |
| dc.subject | null | en_US |
| dc.theme | TO ALTERNARIA LEAF BLIGHT CAUSED BY Alternaria helianthi (Hansf.) Tubaki and Nishihara | en_US |
| dc.these.type | M.Sc | en_US |
| dc.title | STUDIES ON FOLIAR DISEASES OF SUNFLOWER (Helianthus annuus L.) WITH SPECIAL REFERENCE TO ALTERNARIA LEAF BLIGHT CAUSED BY Alternaria helianthi (Hansf.) Tubaki and Nishihara | en_US |
| dc.type | Thesis | en_US |