设施秋延晚无土基质栽培番茄白粉病的发生及防治

[目的]研究设施秋延晚无土基质栽培条件下番茄白粉病的发病状况,筛选适宜生产的低毒、高效农药.[方法]通过5点取样法,对病害进行分级和调查.采用田间小区试验,比较不同农药对番茄白粉病防效差异.[结果]秋延晚番茄白粉病9月28日发生,11月20日达到高峰.11月初温室的平均温度13℃左右,湿度75;左右,适合番茄白粉病的发生及扩散.番茄白粉病发病初期,7种杀菌剂防效均在99;以上.发病前期,40;腈菌唑防效为86.36;,防效最佳.[结论]番茄白粉病在田间为水平和垂直扩展;秋延迟茬口番茄9月中下旬开始发病,是施药的最佳时间,腈菌唑为药剂防治的最佳选择,氟硅唑、醚菌酯、烯唑醇可作为轮换使用药剂.

Occurrence of Powdery Mildew of Autumn Delayed Tomato Cultivated in Facilities Soilless Matrix and Test of Its Pesticide Control

【Objective】The aim of this paper was mainly to investigate the occurrence and spread of Powdery mildew from autumn delayed tomato under the conditions of facilities soilless matrix cultivation and the control effects ot 7 chemical pesticides on Powdery mildew were surveyed to screen the low toxicity and high efficient pesticides.【Method】The classification and investigation of the diseases were made by 5 sample points.comparaed control effect difference of different pesticide on tomato powdery mildew by field plot test.【Result】Autumn delay tomato powdery mildew occurred on September 28,reached the peak on November 20.Tomato powdery mildew occurrenced and spreaded when the average temperature of greenhouse aroud 13 ℃,humidity 75% in early November.The early stages of tomato powdery mildew,7 fungicides were effective against more than 99%.Early onset,control effect of 40% Myclobutanil was 86.36%,the best control effect.【Conclusion】Tomato powdery mildew was horizontal and vertical expansion in the field,Tomato disease of autumn delay stubbles began to appear in September late,was the optimum pesticide time.and Myclobutanil was the best choice,Flusilazole,Azoxystrobin and Diniconazole can be used as the rotationally applied bactericide.