胡萝卜白粉病病情分级标准的建立及其防治药剂筛选

[目的]建立胡萝卜白粉病病情分级标准,并筛选出防治该病害的高效低毒药剂。[方法]根据胡萝卜白粉病发病规律和症状特征制定出该病害的病情分级标准,并通过田间试验测定7种供试药剂对胡萝卜白粉病的防治效果。[结果]7种供试药剂中,0.5%大黄素甲醚水剂防效最高,为79.21%;3种三唑类杀菌剂的防效也均在70%以上。试验药剂对胡萝卜产量的影响与其对胡萝卜白粉病防效不成正比,广谱性杀菌剂代森锰锌和百菌清处理产量最高。[结论]生物制剂0.5%大黄素甲醚水剂和3种三唑类药剂杀菌剂对胡萝卜白粉病具有较好的防治效果。

Establishment of Leaves Grading Standard for Carrot Powdery Mildew and Screening the Suitable Control Fungicides

The paper aims to establish the leaves grading standard for carrot powdery mildew and screen out the suitable control fungicides with high efficiency and low toxicity.[Methods] The leaves grading standard for carrot powdery mildew was established according to the occurrence regularity and the symptom characteristics of the disease in the study.The control efficiency of seven fungicides to carrots powdery mildew was also studied in the field trials.[Results] Physcion 0.5% AS has the best control efficiency among those fungicides reaching 79.21%.the control efficiency of three triazole fungicides were all over 70%.There were no positive correlations between yield and control effect.The treatments with broad spectrum fungicide mancozeb and chlorothalonil got the highest yield,on the contrast with the treatment of physcion got the minimum yield,except its best control efficiency.[Conclusions] The biological agent physcion 0.5% AS and the three triazole fungicides have good effect on controlling carrot powdery mildew.