摘要
试验研究了土壤温度、湿度、pH值和有机质对棉花黄萎病菌微菌核存活的影响。结果表明:40、30和0℃对微菌核土壤存活影响较大,10和20℃影响较小,尤其以10℃影响最小;土壤含水量越高,对微菌核存活影响越大,在含水量低于15％时,对存活影响较小,尤其以5％的含水量影响最小,表明微菌核对土壤干旱逆境具有较强的抵抗能力;pH值低于5.5或高于8.5的土壤条件对微菌核存活影响较大,pH值为6.5～7.5影响较小;土壤有机质含量越高,微菌核存活率越低,含量低,存活率高。本研究结果表明,只要改善和控制棉花黄萎病菌土壤存活的生态条件,就可以有效地减少土壤存活菌量,达到控制病害发生与发展的目的。
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.
出处
《植物病理学报》
CAS
CSCD
北大核心
2004年第2期180-183,共4页
Acta Phytopathologica Sinica
基金
国家"九五"科技攻关项目(96-005-01-04)资助
关键词
土壤
环境因素
棉花
黄萎病菌
微菌核存活率
Verticillium dahliae Kleb.
microsclerotium
subsistence
habitat factor
