3种杀菌剂防治甜菜褐斑病间隔期及效果

本试验新引入三唑类杀菌剂，以期作为苯并咪唑类杀菌剂的轮换药剂，用于甜菜褐斑病的化学防治。为明确三苯基乙酸锡、氟硅唑、苯醚甲环唑防治甜菜褐斑病的施药间隔期和防治效果以及对甜菜产质量的影响，于2013—2014 年，采用田间小区试验的方法进行实地调查测定。试验结果表明：每公顷施用25%三苯基乙酸锡可湿性粉剂1809 g、25%氟硅唑水乳剂300 mL、10%苯醚甲环唑水分散粒剂600 g，施药间隔期为3 周，防治效果分别为77.41%、77.03%、71.36%。3 种药剂对甜菜根产量和产糖量没有显著影响，但能显著提高含糖率，间隔3周施药的处理和对照相比增糖率分别为1.16%、1.56%、1.25%。

Study on Interval Periods and effects of Fungicides to Control CLS of Beet

This experiment took triazole fungicide as the replace agent of benz-imidazole fungicide to control Cercospora leaf spot for sugar beet. In order to study the effects of fentin acetate, flusilazole and difenoconazole on the interval periods and control of CLS and the yield of sugar beet, field plot experiment was conducted from 2013 to 2014. The results showed that when the interval period was 3 weeks, the control efficiency of per hectare applied with 25% fentin acetate wettable powder 1809 g, 25% flusilazole EW 300 mL and 10% difenoconazole water dispersible granule 600 g was 77.41% , 77.03% and 71.36% , respectively. These 3 fungicides did not significantly affect beet root yield and sugar yield, but significantly increased sugar rate, when the interval period was 3 weeks compared with CK, 3 fungicides could increase sugar rate by 1.16%, 1.56% and 1.25%, respectively.