关键词: 土壤, 番茄, 马铃薯粉痂病菌, 检测

Abstract: This experiment is to detect Spongospora subterranea in soil of potato cropping and broad bean cropping，using tomato seedlings as bait plants．The results showed that there were Spongospora subterranea with soil of potato cropping．Using this soil to cultivate tomato would cause tomato plant becoming dwarf at different degree，its root being swollen and with tumor shapes in root．The disease breaking rates of tomato plants grown in one year，two years and three years potato cropping stubble soil were 82.35%，100.00%，100.00%，respectively．However，tomato plants were normal in broad bean cropping soil，the resting spores of Spongospora subterranea were not found in roots.

Key words: Soil, Tomato, Spongospora subterranea, Detect