水稻纹枯病防治药剂筛选和应用技术研究

为了筛选防治水稻纹枯病的高效药剂以及防治适期,开展了3年多地试验。结果表明,施药期由原来的病穴率20%提早到5%,既提高了防效,又减轻了中后期防治压力;不同药剂防效差异大,12.5%氟环唑SC、240 g/L噻呋酰胺SC、75%肟菌.戊唑醇WG等防效高,持效期长,优于井冈霉素单剂。

Fungicide Selections for Controlling Rice Sheath Blight and Research on Application Technology

In order to screen high-efficient fungicides and their optimal application time for controlling rice sheath blight,the field trials were carried out in several places during the last three years.The results showed that when the optimal application time was brought forward to the diseased spikes rate of 5% from original 20%,the control efficiencies could increase,and the middle and late control pressures would fall.The control efficiencies had significant difference among different fungicides.Epoxiconazole 12.5% SC,thifluzamide 240g/L SC and trifloxystrobin + tebuconazole 75% WG had better control efficiencies and longer persistance than validamycin alone.