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Studies on powdery mildew of fenugreek caused by erysiphe polygoni DC

KrishiKosh

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Title Studies on powdery mildew of fenugreek caused by erysiphe polygoni DC
 
Creator Rajesh Kumar
 
Contributor Mehra, Rakesh
 
Subject Livestock, Proteins, Amino acids, Biological phenomena, Concentrates, Methane, Biological development, Acidity, Productivity, Maize
 
Description The Studies on powdery mildew of fenugreek caused by Erysiphe polygoni DC" were conducted in the
Departments of Plant Pathology and Vegetable Science, CCS Haryana Agricultural University, Hisar
during winter (rabi) season of 2008-09. The experiments were laid out in RBD in field and CRD in lab
conditions. Powdery mildew of fenugreek generally occurs during flowering and pod formation stage in
severe form. Seed yield losses due to powdery mildew varied between 18.8 and 20.4 per cent in variety
Hisar Sonali and 19.4-22.5 per cent in variety Hisar Suvarna in both greens cutting and non greens
cutting under unprotected conditions. Out of 118 germplasm lines/varieties of fenugreek screened
against powdery mildew under field and screen house conditions, none was found highly resistant. Only
two genotypes namely NDM-1 and RMt-351 were found resistant under field conditions. However,
under screen house conditions these genotypes were moderately resistant. Four genotypes viz., Am-187,
HM-273, Local Hisar-3, NDM-9 were moderately resistant both under field and artificial inoculation
conditions. Out of five dates of sowing early sown (4th October) and late sown (5th December) crop
showed less disease severity as compared to 19th October, 4th November and 20th November sown
crop. Maximum disease severity was in the crop sown on 4th November in Hisar Sonali, Hisar Suvarna
and HM-65 varieties. Among the five varieties highest disease severity was observed in Hisar Sonali
variety and lowest disease severity on variety HM-350 on all the dates of sowing. Maximum
temperature range of (23.8-31.7 oC) and minimum of (7.9-14.6 oC), relative humidity morning
(91.4–86.9%) and evening (53.3–38.1 %) were most congenial for the disease progression. Regression
equations on relationship between disease development and weather parameters have been developed
for five varieties. Among the seven plant extracts evaluated against Erysiphe polygoni, neem, ginger
and garlic extracts were effective both under in vitro and in vivo conditions, however, the efficacy was
comparatively less in comparison to fungicides which provided more than 95 per cent disease control.
Out of eight fungicides evaluated hexaconazole, propiconazole and dinocap provided disease control
around 99 per cent and also increase seed yield significantly.
 
Date 2016-11-15T13:47:23Z
2016-11-15T13:47:23Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/85631
 
Language en
 
Format application/pdf
 
Publisher CCSHAU