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在紫薇上,有3种白粉菌寄生——Uncinulliella australiana,Erysiphe lagerstroemiae和Phyllactinia corylea经研究,在昆明地区紫薇上的白粉菌应为Uncinulliella australiana,这与雅安地区所发生的紫薇白粉菌同属一种。菌丝体在紫薇芽鳞下越冬,春天来临或给予合适的条件,菌丝体便开始发育蔓延,对紫薇造成初侵染。分生孢子的散布受降水、温度相对湿度及风速的影响。降水明显对分生孢子散布不利。分生孢子散布具有明显的昼夜变化节律。在一年中,紫薇白粉病在春季开始发生,雨季(6月到9月)达到高峰,在晚秋停止了发展。
On crape myrtle, there are 3 kinds of powdery mildew parasites - Uncinulliella australiana, Erysiphe lagerstroemiae and Phyllactinia corylea studied in Kunming, crape myrtle powdery mildew should be Uncinulliella australiana, which occurred in Yaan, the same species of Ziwei powdery mildew. Mycelium in the crape mytiophobes wintering, the spring is approaching or given the appropriate conditions, the mycelium began to develop and spread, causing early infection of crape myrtle. The distribution of conidia is affected by precipitation, temperature relative humidity and wind speed. Precipitation is obviously unfavorable to disseminated conidia. Conidia distribution has a significant circadian rhythm. During the year, the crape myrtle powdery mildew began to occur in the spring, reaching its peak in the rainy season (June to September) and stopped in the late autumn.