How to prevent and cure leaf spot of rhododendron?

How to prevent and cure leaf spot of rhododendron? Please introduce the rhododendron brown spot: at the initial stage of the disease, brown spots appear on the edge of the leaves, and the junction between the disease and health is not obvious, showing light green. Brown? Rust-red transition, with the expansion of the disease, the disease spot expanded or the whole leaf turned brown, causing the leaf to fall off ahead of time, and even the whole plant died, and the disease was the most serious from July to August. Control methods: ① should be shaded properly at high temperature, enhance plant growth, increase the application of organic fertilizer, and improve disease resistance. ② adheres to the principle of giving priority to prevention, spraying 80% of the protective fungicide Dasheng wettable powder 600x to 800x, or 75% Chlorothalonil WP 600x to 800x. At the initial stage of the onset of ③, 12.5% of the internal absorbent fungicide can be sprayed with 2500 times of Richizia wettable powder, or 25% of the enemy demulsifiable oil 1500 times to 2000 times. ③ was used to remove the disabled body and burn it. Click to get more azaleas planting techniques click to get more flower planting techniques