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Tomato (Lycopersicon esculentum Miller) is an importantvegetable crop widely cultivated in China. According to the climate, four ecological districts of tomato cultivation can be distinguished, namely Southern District, Middle and Eastern District, Northern District, and Northeastern District. Tomatoes are grown mainly in plastic tunnels or in open fields. The varieties with large fruit, red or pink are favored. Though there are many diseases and pests which attack tomatoes, only a few of them were included in the breeding programme, such as TMV, CMV, Cladosperium fidvum, Pseudomonas solanacearum. Further work will include the disease resistance to other diseases and pests, fruit quality and long growing season for greenhouse production~ Northeastern District: The three northeastern provinces, i.e., Jielin, Liaoning and Heilongjiang, belong to the Northeastern District. This district has a long winter and a short summer. The growing season for tomato is short.

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A group of differential tomato lines was used to identity the races of Fusarium oxysporum f sp. lycopersici in Zhejiang, China. Marmande verte carries no resistant genes and Marporum carries gene I-l. Both lines Motelle and Mogeor have Gene I-1 and I-2. Tomato seedlings of eighteen days after sowing were inoculated with an isolate of Fusarium oxysporumf sp. lycopersici, No. 98-2 and kept in a growth chamber. The seedlings were evaluated at fourteen days after inoculation. Results showed that Marmande verte and Marporum were severely infected by the pathogen and established as susceptible. Motelle and Mogeor were not infected and established as resistant. These results indicated that the isolate No. 98-2 represented the race 2 of Fusarium oxysporumf sp. lycopersici and gene i-2 is necessary for obtaining resistance to this pathogen in the Zhejiang region.