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《Acta Phytopathologica Sinica》 2004-02
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The effect of soil habitat factors on survival of microsclerotia of Verticillium dahliae of cot-ton

YANG Jia-rong, SHANG Hong-sheng, GAO Li-qiang (The Key Laboratory of Plant Protection Resources and Pests Management of Chinese Ministry of Education, College of Plant Protection, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China)  
The effect of soil temperature,moisture,pH value and organic matter on survival of microscle-rotia of V. dahliae of cotton was estimated. Results showed that soil temperature at 40, 30 and 0℃ had significant effect on survival of microsclerotia while temperature at 10 and 20 ℃ had less effect on survival ,particularly 10℃ had least effect. The higher soil moisture, the higher effect on survival of microsclerotia. Once soil moisture below 15%, it had less effect on survival, especially 5% gave least effect. It demonstrated that microsclerotia had strong resistance to stress of soil dryness. The pH value below 5. 5 or over 7. 5 had higher effect on survival of microsclerotia while pH 6. 5 - 7. 5 had less effect. The higher content of organic matter in soil, the lower viability of microsclerotia and it gave the less effect on survival at lower content of organic matter. Results also indicated that by improving and controlling soil habitat factors for survival of V. dahliae, it was possible to effectively minimize the numbers of microsclerotia survived in soil and to prevent disease occurrence and development.
【Fund】: 国家“九五”科技攻关项目(96-005-01-04)资助
【CateGory Index】: S435.62
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