The Influence of Soil Temperature, Soil Moisture, Soil Texture, and Inoculum Density on the Incidence of Sorghum Downy Mildew
- 1 January 1987
- journal article
- research article
- Published by Scientific Societies in Phytopathology®
- Vol. 77 (2) , 125-128
- https://doi.org/10.1094/phyto-77-125
Abstract
The incidence of sorghum downy mildew [Peronosclerospora sorghi] was influenced by combinations of soil moisture-soil temperature, and soil texture-inoculum density. Statistical significance was determined using logistic regression. No significant interaction (P = 0.05) was observed within the parameters pairs. A soil temperature-soil moisture combination of 25.degree. C and -0.2 bar and a soil texture-inoculum density combination of 80% sand content and 5 g of oospore powder per 100 g of soil gave the highest disease incidence. The results suggest that soils that are saturated after planting have soil temperatures below 20.degree. C, or sand contents below 20% might be classified as disease suppressive.Keywords
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