What happened to the dried leaves of Melaleuca?

Powdery mildew is a worldwide disease with a wide range of hosts, and zinnia is an important target of its invasion. Powdery mildew of zinnia is widespread in the provinces and cities where Lagerstroemia indica is planted in China. After the disease occurs, the leaves of Lagerstroemia indica often wither and fall off, which directly affects the tree potential and ornamental effect. 1) Gardening has a strong ability to control the sprouting of zinnia, so for seriously ill plants, all the branches of the year can be cut off and burned in winter, thus completely eliminating the source of the disease. If potted zinnia is found to be infected with powdery mildew, the diseased leaves should be removed in time and the potted flowers should be placed in a ventilated and light-transmitting place. In field cultivation, it is necessary to control planting density, strengthen daily management, pay attention to increasing the application of phosphorus and potassium fertilizer, control the application amount of nitrogen fertilizer, and improve the disease resistance of plants; At the same time, we should also pay attention to the selection of disease-resistant varieties. 2) In areas where chemical agents are used to control diseases seriously, Pomei 3-4 degree lime-sulfur mixture can be sprayed before spring germination; In the growing season, 80% zineb wettable powder can be sprayed 500 times, 70% thiophanate methyl 1000 times, 20% triadimefon EC 1500 times and 50% carbendazim wettable powder 800 times.