Indoor Toxicity Test of Ten Fungicides and Their Mixtures to Jujube Black Spot Pathogen

doi:10.11924/j.issn.1000-6850.2012-3160

Abstract

Abstract: The aims were to screen the pesticides of controlling Jujube Black Spot effectively, reduce the peasants' blindness of pesticide application, improve the control level of disease and enhance the economic efficiency of jujube orchard. The toxicity measurement used spore germination method. Firstly the fungicides concentration range was determined on the basis of preliminary test, and then the fungicides virulence was determined in the laboratory. The results showed that the toxicity of 25% pyraclostrobin EC was strongest, with the EC₅₀ of 0.0373 mg/L. Followed by 50% flusilazole·azoxystrobin AS and 80% carbendazim WP and 10% difenoconazole WG with 16.0725 and 43.8137 and 63.198 mg/L EC₅₀ values respectively. While 50% tebuconazole·prochloraz AS behaved worst and its EC₅₀ was 7007.383 mg/L. The mixtures of 80% carbendazim WP and 25% pyraclostrobin EC with ratio of A (6:1), B (3:1) and E (1:6) had the highest cotoxicity coefficient of 698.3147, 5131.721, 322.2999, and the synergies was very obviously. The virulence experiments indicated that 25% pyraclostrobin EC, 50% flusilazole·azoxystrobin AS, 10% difenoconazole WG and 80% carbendazim WP agent had relatively strong virulence to jujube black spot pathogen and could be used in further production.

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