Fifteen different pumpkin hybrid lines were screened to the powdery mildew -resistance which inoculum pathogen species. According the inoculum results showed that the virulence were different by the host hybrid lines. There were a few of hybrid lines resistant to the powdery mildew. We construct a grade of the powdery mildew –resistance in pumpkin.。Watermelon seeds inoculated with 108CFU/ml Acidovorax avenae subsp.citrulli were planted in 72-cell plug after germination. The seedlings were poured with culturing media of different rhyzosphere bacterial. By this method 4 antagonist bacterial : No. 15-7， 15-8，15-9 and 15-10 were screened. They made the survival rate of watermelon seedlings increasing 3 times than the control. These bacterial may be used to develop microbial pesticides.。The amino acid sequences of potato viruses coat protein were analyzed by a contractor. However the synthesized peptides were not detected by western blotting with commercial antiserum anti PVS， PVX， PVY. It is necessary to clon full-length coat protein genes of viruses. Then inducing expression of recombitant proteins for antiserum production is better.。The cucumber treated with different concentrations phosphorous acid，investigated the effect for the downy mildew during cultivated period.Result showed that the different concentrations phosphorous acid was effective on the cucumber downy mildew. The phosphorous acid applied at 2g/l was better than at 1g/l， and the effect was better while applying continuously. The spider mites could be control by treated with the narrow range oil(2㏄/l， 1㏄/l) and China-berry oil(2㏄/l， 1㏄/l) but the effect was temporary。
Fifteen different pumpkin hybrid lines were screened to the powdery mildew -resistance which inoculum pathogen species. According the inoculum results showed that the virulence were different by the host hybrid lines. There were a few of hybrid lines resistant to the powdery mildew. We construct a grade of the powdery mildew –resistance in pumpkin.。Watermelon seeds inoculated with 108CFU/ml Acidovorax avenae subsp.citrulli were planted in 72-cell plug after germination. The seedlings were poured with culturing media of different rhyzosphere bacterial. By this method 4 antagonist bacterial : No. 15-7， 15-8，15-9 and 15-10 were screened. They made the survival rate of watermelon seedlings increasing 3 times than the control. These bacterial may be used to develop microbial pesticides.。The amino acid sequences of potato viruses coat protein were analyzed by a contractor. However the synthesized peptides were not detected by western blotting with commercial antiserum anti PVS， PVX， PVY. It is necessary to clon full-length coat protein genes of viruses. Then inducing expression of recombitant proteins for antiserum production is better.。The cucumber treated with different concentrations phosphorous acid，investigated the effect for the downy mildew during cultivated period.Result showed that the different concentrations phosphorous acid was effective on the cucumber downy mildew. The phosphorous acid applied at 2g/l was better than at 1g/l， and the effect was better while applying continuously. The spider mites could be control by treated with the narrow range oil(2㏄/l， 1㏄/l) and China-berry oil(2㏄/l， 1㏄/l) but the effect was temporary。