Powdery mildew is prone to occur at high temperatures, low light, poor ventilation, and high air humidity. And appeared in the buds, leaves, shoots, buds and pedicels, the beginning of the attack site appeared chlorotic spots, gradually become white spots; later turned yellow. The affected plants are short, young shoots are bent, the leaves are uneven and the flowers are deformed. Control methods: pay attention to ventilation and strengthen light; in order to increase resistance to disease, it is necessary to increase phosphate fertilizer. After the onset of disease, the disease can be cut off in time or completely removed and destroyed.
At the early stage of disease, 70% thiophanate-methyl 800 times can be sprayed to disinfect and spread.
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