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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
 
Creator Sanjivareddi Y.B.
 
Contributor P.V. Patil
 
Subject Plant pathology
 
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.
 
Date 2016-11-14T13:22:35Z
2016-11-14T13:22:35Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/85413
 
Format application/pdf
 
Publisher UAS, Dharwad