Screening of Fungicides against Strawberry Botrytis cinerea and Study on Synergistic Effect

[Objective] The complex formulation of fungicides against strawberry Botrytis cinerea was screened out to lay the basis for re-preparation study on strawberry Botrytis cinerea. [Method] Antibiotic activities of fungicides like Procymidone,Diniconazole,Triadimefon and Azoxystrobin against strawberry Botrytis cinerea Pers. were studied by bioassay,and synergistic effect of Procymidone and Diniconazole was studied.[Result]The 4 fungicides had exhibited antibiotic activity against Botrytis cinere and the activities of Procymidone and Diniconazole were obvious,their values of EC50 were 0. 521 2 and 0. 752 8 μg / ml,respectively. All blends of Procymidone and Diniconazole with different mass ratio had addition effect against Botrytis cinerea Pers,and when the mass ratio of Procymidone and Diniconazole was 4∶ 1,the effect was the most obvious addition effect,and the value of co-toxicity coefficient was 111. 737 4. [Conclusion] When the mass ratio of Procymidone and Diniconazole was 4∶ 1,the blends had good control spectrum,low dosage and decreasing resistance,so it could be explored further.