ICAR Research Data Repository for Knowledge Management
“STUDIES ON FALSE SMUT OF RICE IN CHHATTISGARH REGION”
KrishiKosh
View Archive Info| Field | Value | |
| Title |
“STUDIES ON FALSE SMUT OF RICE IN CHHATTISGARH REGION”
M.Sc. (PLANT PATHOLOGY) |
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| Creator |
Muraleedharan, Anish
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| Contributor |
Thrimurty, V.S.
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| Subject |
FALSE SMUT, RICE, CHHATTISGARH
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| Description |
The present investigation entitled “Studies on false smut of rice in Chhattisgarh region” was conducted in the Department of Plant Pathology, Saveer mist chamber and at the research farm, I.G.K.V., Raipur (C.G.). Twenty-five each early, medium, late duration cultivars and three hybrids were evaluated for their per cent incidence, per cent grain infection per panicle and disease severity index. All the duration group varieties showed susceptibility to false smut, though with varying levels. The effect of false smut disease was pronounced more in the late duration cultures and hybrids as compared to early and medium durations. No particular trend was observed in the disease development within the cultures of different durations groups. Varietal character might have also played an important role for the differences in false smut severities among the cultivars. The weather conditions prevailed also influenced the false smut incidence and severity index. Rainy days were almost experienced during all the durations varietal flowering period, which might have also influenced the false smut incidence in all the duration cultivars. Low maximum temperature for a protracted period and high relative humidity (>90%) during the crop growth period along with good amount of precipitation might have played an important role in all the duration cultivars and especially in late duration group. Spore balls and chlamydospores of the pathogen studied under in-vitro conditions showed variability. Per cent germination of the chlamydospores was found to be influenced by the pH, glucose concentrations and different temperatures. The near neutral pH (6.5), glucose concentration of 0.1 per cent and temperatures around 30C enhanced the germination per cent. In field water, per cent chlamydospores germinated were more as compared to standard nutrient solution. The plants inoculated with spore dusting, spore suspension and germinated spore suspension sprayed on the susceptible variety did not initiate the infection and symptoms. Therefore, the artificial inoculation methods need further investigation and detailed study. None of the six varieties studied for per cent seed infection of false smut were free from the pathogen. Maximum per cent infected seed were observed in the varieties HMT Sona, MTU-1010 and Pusa Basmati-1. The seed borne infection may also contribute for the primary inoculum and spread of the pathogen from one geographic to other regions. All the ten promising rice cultivars evaluated for the losses in yield showed considerable losses but with varying levels. Maximum loss in yield was observed in the cultivars Sahyadri, followed by MTU-1010, Pusa Basmati-1 and HMT Sona. In addition to the direct losses due to smutted balls, indirect losses due to increase in chaffy grains and decrease in the 1000-grain weight of infected panicles also might have contributed to the yield loss. It may be inferred that under congenial weather conditions the false smut disease incidence can cause considerable losses in yield. |
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| Date |
2016-09-21T12:38:33Z
2016-09-21T12:38:33Z 2004 |
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| Type |
Thesis
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| Identifier |
107p.
http://krishikosh.egranth.ac.in/handle/1/77995 |
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| Language |
en
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| Format |
application/pdf
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| Publisher |
INDIRA GANDHI KRISHI VISHWAVIDYALAYA, RAIPUR
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