What diseases should azaleas prevent in spring and summer?

What diseases should azaleas prevent in spring and summer? Diseases that can easily occur in rhododendrons in spring and summer are: (1) Black spot disease if the locations of azaleas (including rhododendrons and all kinds of rhododendrons) are stuffy and overcast for a long time, then it is easy to induce the disease in humid weather or excessive daily moisture; it is caused by a fungus that spreads from the air. If the ambient air near the cultivation is polluted, it is also easy to spot the leaves. The spores of fungi will be scattered in the basin soil, and the hyphae will first grow on the old and weak leaves, which will spread quickly, causing the leaves to fall off from the bottom up. (2) Brown spot on rainy days, high temperature and humidity, leaves are prone to small brown spots, resulting in yellow, withered, wrinkled leaves, and then lost. The usual prevention and control methods are the same as dealing with black spot, increasing stronger scattered light, removing air circulation and drier places. Eight hundred times of "topiramate" or a thousand times of "plant protection" can be used for pesticide application. (3) chlorosis is caused by lack of iron and emblem elements, or excessive alkalinity of the soil; several rusty iron nails can be buried in the soil, or a little ferrous sulfate can be sprinkled in the basin, one gram at a time. (4) the disease of stem rot is yin and dampness, which makes the fungi invade the cortex, cut off the transport of water and nutrients, and the leaves dry up. Every day, appropriate potash fertilizer should be applied, more light should be increased, and places with good ventilation should be moved. Click to get more azaleas planting techniques click to get more flower planting techniques