4%增效农抗120对几种主要果树病害的试验效果

Effect of Agricultural Antibiotic 120 4% Aqueous Solution on Main Leaf Diseases of Apple and Pear Trees

利用 4%增效农抗 1 2 0水剂 ,针对苹果轮纹病、苹果轮斑病、苹果炭疽病和梨黑星病 4种病害开展了室内和田间试验。对苹果轮纹病菌、炭疽病菌和轮斑病菌的室内抑菌试验采用平板稀释法测定 ,对梨黑星病菌采用孢子萌发法测定。室内对 4种病菌的EC50 分别为 1 .92、5.56、1 7.1 4、4 3 6mg/L。田间试验结果 :4%增效农抗 1 2 0浓度为 68mg/L防治 4种病害的效果分别为75 3 3 %、90 1 6%、73 2 2 %、81 61 % ,均高于对照药剂多菌灵 560mg/L防治

Agricultural Antibiotic 120 (AA120) 4% aqueous solution, developed by Institute of Biological Control of CAAS, has positive effect on four leaf diseases of apple and pear trees: Physalospora piricola, Glomerella cingulata, Alternaria mali and Venturia pyrina in lab and fields. The methods of efficacy trial in lab were dilution method and spore germination method. According to China′s National Standard GB/T17980-2000, the efficacy trial was done in Henan and Shanxi province. The EC_(50) of this new product to the four diseases were respectively 1.92, 5.56, 17.14 and 4.36mg/L in lab. The effect of 68mg/L AA120 on the four diseases were respectively 75.33%, 90.16%, 73.22%, 81.61% in fields. The effect of 50mg/L AA120 on them were respectively 66.67%, 86.53%, 66.52% and 79.31% in fields. The effect of 40mg/L AA120 on them were respectively 59.67%, 76.68%, 60.78% and 71.26% in fields. The effect of 560mg/L Duojunling (pesticide) on them were respectively 66.00%, 89.64%, 36.73% and 69.89% in fields. Then through comprehensive consideration of cost and the fields efficacy, we estimate that the best concentration of AA120 to control G. cingulata and V. pyrina is 50mg/L, to P. piricola and A. mali is 68mg/L.