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大豆孢囊线虫（Ｈｅｔｅｒｏｄｅｒａｇｌｙｃｉｎｅｓ）孢囊密度，随大豆连作年数的增长而上升，５～６年达到高峰后出现衰退。同一病田种植一茬大豆、玉米和水稻后，孢囊密度各比前茬增９５．０％，－５６．４％和－９０．４％；孢囊带真菌率分别增６．３％，２３．６％和５４．２％；发生频率最高的真菌分别是Ｆｕｓａｒｉｕｍｓｏｌａｎｉ，Ｐａｅｃｉｌｏｍｙｃｅｓｓｐ．和无孢丝状菌。在３种轮作田间均发生孢囊的真菌有Ａｃｒｅｍｏｎｉｕｍｓｐｐ．Ａｕｒｅｏｂａｓｉｄｉｕｍｐｕｌｌｕｌａｎｓ，Ｃｙｌｉｎｄｒｏｃａｒｐｏｎｄｅｓｔｃｔｕｎｓ，Ｃ．ｄｉｄｙｍｕｍ，Ｆｕｓａｒｉｕｍｓｏｌａｎｉ，Ｆ．ｏｘｙｓｐｏｒｕｍ，Ｇｌｉｏｃｌａｄｉｕｍｃａｔｅｎｕｌａｔｕｍ和Ｇ．ｒｏｓｅｕｍ。
The cytoplasm density of Heteroderalycines increased with the number of years of continuous cropping and declined after the peak of 5-6 years. After planting a crop of soybean, corn and rice in the same field, the density of the cyst was increased by 95.0%, -56.4% and -90.4%, respectively. The fungal rates in the cyst were increased by 6.3% 23.6% and 54.2%, respectively; the most frequently occurring fungi were Fusarium solani and Paecilomycess p. And non-filamentous filamentous bacteria. Acremoniumspp was found in the cysts of all three cropping fields. Aureobasidiumpullulans, Cylindrocarpondestctuns, C. didymum, Fusariumsolani, F. oxysporum, Gliocladiumcatenulatum and G. roseum.