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芒果白粉病在云南景谷湿热气候芒果种植区 ,对 3年芒果树、象牙芒果树花序、幼果为害率分别为 75.4%～ 91 .6% ,3 2 .1 %～ 54 .3 % ,严重的达 1 0 0 % ,是幼果脱落的主要原因之一 ,损失产量 2 5%～ 3 0 % ,病重树基本绝收。芒果白粉病于2月中、下旬至 5月上、中旬发生为害 ,3月上、中旬至 4月中、下旬为发生高峰期 ,正与芒果盛花期吻合。该病繁殖和侵染最适温度为 1 5℃～ 2 5℃ ,相对湿度为 80 %～ 1 0 0 %。采取综合防治措施 ,特别在盛花期、盛花末与座果交替期各喷药防治 1～2次 ,花序、幼果为害率下降为 5.2 %～ 7.6% ,2 .9%～ 3 .7%。提高了座果率 ,挽回产量 1 5%～ 2 0 %。
Mango powdery mildew in the Yunnan Valley wet and hot climate mango growing areas, mangrove 3-year-old mango tree, ivory mango inflorescence, young fruit damage rates were 75.4% ~ 91.6%, 32.1% ~ 54.3%, severe Up to 100%, is one of the main reasons for the loss of young fruit, loss of yield 25% ~ 30%, the disease is almost absolutely dead weight tree. Mango powdery mildew in mid-February, mid-May and mid-term damage occurred in mid-March to mid-April in late peak occurs, is coinciding with the flowering of mango. The optimum temperature for breeding and infection of the disease is 15 ℃ ~ 25 ℃, relative humidity is 80% ~ 100%. Take comprehensive prevention and control measures, especially in full flowering, flowers and the end of alternating fruit spray prevention and treatment of 1 or 2 times, inflorescence, young fruit damage rate decreased 5.2% to 7.6%, 2. 9% to 3. 7%. Improve the rate of fruit set, save 15% ~ 20% of production.