10种杀菌剂及其混配剂对骏枣黑斑病菌室内毒力测定

旨在筛选出能有效防治南疆骏枣黑斑病的药剂,减少农民用药的盲目性,从而提高病害防治水平,增强枣园经济效益.室内毒力测定采用孢子萌发法,首先在预试验的基础上确定杀菌剂浓度使用范围,然后测定杀菌剂的室内毒力.试验结果表明25％吡唑醚菌酯EC50值毒力最高,其EC50值为0.0373 mg/L.其次为50％氟硅·嘧菌酯AS、80％多菌灵WP及10％苯醚甲环唑WG,其EC50值分别为16.0752 mg/L、43.8137 mg/L、63.198 mg/L.50％戊唑·咪AS毒力最差,其EC50值为7007.383 mg/L.农药混配试验结果表明:80％多菌灵WP与25％吡唑醚菌酯EC以A(6∶1)和B(3∶1)及E(1∶6)混配其共毒系数分别达到698.3147、5131.721和322.2999,增效作用明显.25％吡唑醚菌酯EC、50％氟硅·嘧菌酯AS、10％苯醚甲环唑WG和80％多菌灵WP药剂对骏枣黑斑病菌毒力相对较强,可进一步在生产上试验应用.

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

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.