香蕉叶斑病防控药剂及关键施用期的综合效应分析

为了明确防治香蕉叶斑病药剂的使用方法。本研究开展11种药剂、6种药剂组合和3种剂型的防效和使用安全性的评价。结果表明：11种药剂在现蕾前1个月施药的防效最高,均高于71.4%；现蕾时的最低,为57.3%。C2 (代森锰锌+甲基托布津+苯醚甲环唑)为本研究的最优组合,防效为76.5%,成本为312.0元/hm₂。丙环唑3种剂型的防效差异不显著,对幼果有药害。对于香蕉蕾期叶斑病的防治,现蕾前1个月为最佳防治时期,药剂可选择保护性和治疗性药剂组合使用,现蕾后避免使用乳油剂型的农药,和丙环唑、戊唑醇和氟硅唑。

Comprehensive Analysis of the Control Effect on the Fungicides and Key Application Time against Banana Sigatoka

The effective, economic, and safe application method of fungicides against banana sigatoka was investigated in banana garden. 11 different kinds fungicides, 6 combinations of different kinds fungicides and 3 fumulation of propiconazole was application against banana siagtoka for evaluation the control effect and the safety of fruit. The results showed: the control effect of the 11 different kinds fungicides were best, which were applied at one month before bud appearing, all of them were more than 71.4%, and the control effect was the lowest at appearing bud, was less than 57.3%. Comprehensive analysis of the control effect, safety and input, C2 ( Mancozeb+ Methylthiophanate+ Difenoconazole) was the optimal combination with the control effect of 76.5% and the input of 312 yuan /ha₂. There were not significant differences among the control effect of three fumulation of Propiconazole; for fruit safety, there was mild phytotoxicity with water emulsion, and severity phytotoxicity with emulsifiable concentrate and microemulsion. The key time of applying fungicides was one month before appearing bud, protective fungicides can be applied before appearing bud, and curative fungicides is recommended applied after appearing bud, but avoid the application of emulsion and types fungicides, for example Propiconazole, Tebuconazole and Flusilazole.