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从健康西瓜根组织和根际土壤中分离到６８个荧光假单胞菌株。８０．８８％的菌株具有较强的皿内颉颃作用；４．４１％的菌株活体和１９．１２％的菌株代谢物明显抑制西瓜枯萎菌分生孢子的萌发；５２．０８％的菌株可以不同程度抑制枯萎菌在瓜苗导管内定殖；２３．５３％的菌株可以利用几丁质作为碳源。用自然的大田土进行温室盆栽试验，Ａ６３，Ａ５１和Ａ４１菌株在各枯萎菌浓度水平下均表现出较好的防病作用。Ｄ３３，Ａ６１和Ａ６３对瓜苗具有明显促进作用。
Sixty-eight Pseudomonas fluorescens strains were isolated from healthy watermelon root tissue and rhizosphere soil. 80.88% of the strains had a strong antagonistic effect on the dish; 4.41% of the live strains and 19.12% of the strain metabolites significantly inhibited the germination of the conidia of Fusarium oxysporum; 52.08% of the strains could be different Fusarium oxysporum was inhibited by Fusarium oxysporum within 23.53% of the strains. Chitin was used as carbon source. The greenhouse experiments were conducted in the field with natural soil. The A63, A51 and A41 strains showed better disease-prevention effect under the Fusarium oxysporum concentrations. D33, A61 and A63 on melon seed has a significant role in promoting.