ISHS Acta Horticulturae 696: VII International Symposium on Temperate Zone Fruits in the Tropics and Subtropics - Part Two
EFFECT OF EPIDEMIOLOGICAL PARAMETERS ON THE DEVELOPMENT OF WEB BLIGHT OF STRAWBERRY |
| Authors: | L.N. Bhardwaj, R. Bala, B. Gupta |
| Keywords: | web blight, Rhizoctonia solani, strawberry, epidemiological parameters |
| Abstract:
Strawberry (Fragaria × ananassa Duchesne) is one of the most important soft fruit crops cultivated commercially in tropical, sub-tropical and temperate climates upto an elevation of 3000 m amsl. The crop suffers heavily due to various soil borne diseases of which Rhizoctonia leaf blight (Rhizoctonia solani Kuhn) is most damaging wherever strawberry is grown in the state of Himachal Pradesh. In the present investigation, epidemiological parameters responsible for the development of Rhizoctonia leaf blight were studied. The test pathogen, R. solani preferred a temperature of 25°C, 100 per cent soil moisture, leaf wetness duration up to 48 hours and intermittent leaf wetness duration up to 48 hrs for the development and spread of root rot and web blight under pot culture conditions. However, under field conditions, high rainfall coupled with high soil moisture, high relative humidity and soil temperature ranging between 23 to 25°C prevailing during July-August were found conducive for the development and spread of web blight. The area under disease progress curve (AUDPC) was also highest during the rainy season. The correlation between mean temperature, average relative humidity mean soil moisture and mean soil temperature with web blight severity was positive and significant. | |
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