Please use this identifier to cite or link to this item: http://krishikosh.egranth.ac.in/handle/1/5810029799
Authors: Bheemaraya, A.
Advisor: Dr. M. M. Jamadar
Title: SUNFLOWER POWDERY MILDEW CAUSED BY Erysiphe cichoracearum DC. - EPIDEMIOLOGICAL CONSIDERATIONS
Publisher: University of Agricultural Sciences, Dharwad
Language: en_US
Type: Thesis
Agrotags: null
Keywords: SUNFLOWER POWDERY MILDEW CAUSED BY Erysiphe cichoracearum DC. - EPIDEMIOLOGICAL CONSIDERATIONS
Abstract: Sunflower is one of the important oilseed crops of India. Among the different diseases on sunflower; the powdery mildew caused by Erysiphe cichoracearum DC has been a serious disease in northern Karnataka resulting in sever losses in yield and other quality parameters. In the present investigation, a random roving survey conducted during kharif 2013 in five districts of northern Karnataka revealed maximum disease severity in Raichur (37.73%) followed by Koppal districts (35.58%) and least intensity was observed in Bijapur district (5.73%). The sunflower crop sown in I fortnight of October recorded maximum disease severity (39.64 %) followed by II fortnight of September (74.07%) and the least disease severity (8.80%) recorded in II fortnight of July sown crop. Maximum conidial germination of 68.24% and 79.70% was found at 250C temperature and 85% relative humidity, respectively. Maximum and minimum temperature, maximum and minimum vapour pressure and both morning and evening relative humidity had significant negative correlations with disease in irrespective of different crop growth periods (40, 60, 80 and 100 days after sowing). However, rainfall was negative but non-significant in its relationship with powdery mildew infection. Marked significant positive correlation of cloud cover was noticed with disease intensity at 40, 60 and 80 days crop growth stages. In vitro evaluation of different fungicides for their sensitivity against E. cichoracearum revealed that propiconazole 25EC (94.05%) across all the concentrations was significantly superior in inhibition of spore germination followed by penconazole 10 EC (92.08%) and hexaconazole 5EC (90.93%). Out of 84 genotypes screened, three genotypes viz. DRSI-149, RHA-859 and RHA-278 showed immune reaction, while 25 genotypes were resistant, 50 moderately resistant and 6 moderately susceptible.
Subject: Plant Pathology
Theme: SUNFLOWER POWDERY MILDEW CAUSED BY Erysiphe cichoracearum DC. - EPIDEMIOLOGICAL CONSIDERATIONS
These Type: M.Sc
Issue Date: 2014-06-01
Appears in Collections:Thesis

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