Investigation on Powdery Mildew (Erysiphe cichoracearum DC. F.sp. Hilianthi Jacz.) of Sunflower in Northern Dry Zone of Karnataka
KrishiKosh
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Title |
Investigation on Powdery Mildew (Erysiphe cichoracearum DC. F.sp. Hilianthi Jacz.) of Sunflower in Northern Dry Zone of Karnataka
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Creator |
Sanjivareddi Y.B.
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Contributor |
P.V. Patil
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Subject |
Plant pathology
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Description |
The present investigations on powdery mildew (Erysiphe cichoracearum DC. f.sp. helianthi Jacz.) of sunflower in northern dry zone of Karnataka was carried out at Department of Plant Pathology, College of Agriculture, Dharwad and Regional Agricultural Research Station (RARS), Bijapur during the year 2010. The survey during 2010-11 revealed that, the disease was noticed in varying intensities in five districts. Maximum disease severity was in Bijapur (70.83 PDI) and Bagalkot (47.37 PDI) followed by Gadag (35.66 PDI), Haveri (25.87 PDI) and Dharwad (24.70 PDI). Highest germination of conidia (85.63%) was found at 250C temperature and 85 % RH. Out of 13 weed hosts tested for host range, none of them developed symptoms of E. cichoracearum f.sp. helianthi. Second date of sowing (7.09.2009) recorded maximum disease severity (85.18%) followed by first date (21.08.2009) (74.07%) and third date (24.09.2009) of sowing (44.06%). Maximum temperature was significantly negatively correlated with PDI (-0.709), Morning relative humidity was significantly positively correlated (0.607). Rainfall was significantly positively correlated with PDI (0.348). Under in vitro condition irrespective of fungicide concentration, hexaconazole (83.52%) was best but on par with other fungicide. Irrespective of botanical concentrations, soldier (72.15%) was superior which is on par with fire (69.60%). At 30 per cent of ITK concentration, panchagavvya (70.88%) was superior followed by cow urine (67.75%). In IDM, hexaconazole-hexaconazole at 0.1% spray showed least disease severity followed by wettable sulphur-wettable sulphur at 0.3%. Maximum B:C ratio was obtained in wettable sulphur - wettable sulphur (1:14.52) followed by hexaconazole?hexaconazole (1:9.76) and least in wettable sulphur ? fire. Among 63 sunflower genotypes screened against powdery mildew, none of the genotype showed resistant reaction and only two genotypes (TX16R and 6D-1) showed moderately resistant, 17 as susceptible and rest were highly susceptible. Among 10 primers tested, OPA-19 showed polymorphism for resistance against powdery mildew of sunflower. |
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Date |
2016-11-14T13:22:35Z
2016-11-14T13:22:35Z 2012 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/85413
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Format |
application/pdf
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Publisher |
UAS, Dharwad
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