Grey mould mainly damages leaves. Spots often occur along the leaf margin, semi-circular or round to irregular, water crumpled, dark green to brown. When the humidity is high, the whole leaf becomes dark brown and rotten when the disease rapidly expands, and the disease produces gray mould layer.
Once the disease spots are found, the diseased leaves should be cut off in time. Strengthen the ventilation treatment to keep the soil and growth space humidity suitable.
28% gray mold wettable powder 800 times liquid can be used for chemical control. When spraying the medicine, be careful not to sprinkle it on the leaf center to avoid causing the black of the leaf center of the plant.
Powdery mildew occurs in leaves, young stems, petioles, flower buds, petals and other parts. At the initial stage, it is irregular yellow green spots with no obvious edge. Subsequently, the disease spots continued to expand, with white spots on the surface, and finally countless black spots.
The infected part turns gray, covering its surface continuously, the edge is not clear, showing dirty white or light gray white. When seriously injured, the leaves shrink and become smaller, the young shoots are twisted and deformed, and the flower buds do not open.
During the growth period, chlorothalonil can be sprayed on the stem of the plant for prevention.
When the disease is prevalent, spray 1000 times of 15% Triadimefon, 200 times of 2% antifungal agent and 1000-1500 times of 10% polyantifungal agent.
Because of the repeated use of traditional drugs, the bacteria produce antibodies and the effect is sharply reduced, so it is recommended to use them alternately.
In addition, 1000 times liquor (35% alcohol) can also be used. Spray once every 3 to 6 days, 3 to 6 times continuously, and wash leaves until there is no white powder.
