Cucumber of “Zhongnong 26” and marigold were intercropped in substrate containing root-knot nematodes. The effects of intercropping density of marigold on the growth, physiological characters, yield of the cucumber and the control effect on Meloidogyne incognita were studied. Results showed that, when the intercropping density of marigold to cucumber is 1 to 1, the number of nematodes reduced by 49.3%, the chlorophyll content was significantly higher while the activities of SOD, POD and CAT decreased significantly in comparision with those of CK (not intercropped with marigold). However, the yield of cucumber was increased by 39.7%than that of CK. When the intercropping density of marigold to cucumber is 3 to 1, the number of nematodes reduced by 66.7%compared with that of CK. The fresh and dry weight of shoot was decreased. However, the chlorophyll content, antioxidant enzyme activity and yield of cucumber were same as those of CK. When the intercropping density of marigold to cucumber is 2 to 1, the number of nematodes reduced by 66.7%compared with that of CK and the disease index reduced by 51.4%. The chlorophyll content in leaves of cucumber was higher and the SOD, POD, CAT activities were lower compared with CK. As a result, the yield of cucumber increased by 35.7%and there was no significant difference compared with that of CK. These results indicated that 2 to 1 is the appropriate intercropping density of marigold to cucumber to control the damage caused by root-knot nematodes.%以黄瓜“中农26”为试材，评估了万寿菊间作密度对南方根结线虫的防治效果，研究了万寿菊间作密度对黄瓜生长、生理特性和产量的影响。结果表明，与不间作万寿菊处理相比，万寿菊间作密度为黄瓜密度1倍时，黄瓜根结线虫数量降低49.3%，叶绿素含量显著高于对照，但根系SOD、POD、CAT酶活性明显降低，黄瓜增产39.7%；万寿菊间作密度为黄瓜密度3倍时，黄瓜根结线虫数量较对照降低66.7%，黄瓜地上部干鲜重均明显降低，但叶绿素含量、根系抗氧化酶活性和黄瓜产量与对照无差异；万寿菊间作密度为黄瓜的2倍时，黄瓜根结线虫数量较对照降低66.7%，病情指数较对照降低51.4%，叶绿素含量显著高于对照，但根系SOD、POD、CAT酶活性降低，黄瓜生长较正常，比对照增产35.7%，并且与万寿菊间作密度为黄瓜密度1倍时的黄瓜产量无统计差异。因此，万寿菊的间作密度为黄瓜密度的2倍是防治黄瓜根结线虫较为适宜的间作密度。
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