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塑料覆盖栽培的多湿环境，导致了番茄叶霉病的发生与发展。本文在番茄单抗病毒病育种研究的基础上进一步研究和查明了北京地区叶霉病生理小种的分化是以“１、２”混合小种为主，抗性基因中Ｃｆ１为中度感病基因，Ｃｆ２为高度感病基因，Ｃｆ３为耐病基因。Ｃｆ４、Ｃｆ５、 Ｃｆ９为免疫基因。 选用Ｃｆ４抗性基因作为抗源，与对ＴＭＶ高抗的材料杂交，经人工抗性筛选和田间鉴定相结合的方法，育成新品种‘双抗２号’（Ｆ１）。经北京郊区两年（１９８６～１９８７）区试，两年（１９８７～１９８８）示范栽培，肯定了‘双抗２号”对叶霉病免疫，对ＴＭＶ高抗，经济性状优良，栽培效益高，系保护地栽培专用之优良新品种。
Plastic covered cultivation of wet environment, leading to the occurrence and development of tomato leaf mold. In this paper, based on the study of tomato disease virus breeding, it was further studied that the differentiation of the leaf race ecotypes in Beijing was dominated by “1, 2” mixed race and the resistance gene Cf1 was moderate Disease gene, Cf2 is a highly susceptible gene, Cf3 is a resistance gene. Cf4, Cf5, Cf9 are immune genes. The Cf4 resistance gene was selected as the resistant source and crossed with the TMV highly resistant material. The new variety ’Shuangkang 2’ (F1) was bred by artificial resistance screening and field identification. After two years (1986 ~ 1987) trial in the suburbs of Beijing and two years (1987 ~ 1988) demonstration cultivation, it was confirmed that ’Shuangkang No.2’ was immune to leaf mold, high resistance to TMV, good economic traits, Department of Conservation Cultivation of fine new varieties.