What are the pest and disease control methods for yellow azalea (Rhododendron molle)

Leaf gall disease

Since yellow azalea (Rhododendron molle) is also a type of rhododendron, it has a fairly high chance of being prone to leaf gall disease. The spots may appear on the front or the back, and in severe cases both stems and leaves will swell up, and in serious cases it looks just like a biscuit. This disease is most likely to appear from March to May. When symptoms appear, first remove the diseased leaves, but do not throw the removed leaves away casually - it is best to burn them so the disease will not spread, then simply spray with a specialized chemical.

Leaf spot disease

This disease is fairly common, and you can guess the symptoms from its name - diseased spots grow on the leaves. When you encounter the symptoms, just as with the previous case, first pick off the leaves and burn them, then protect the plants that have not yet developed the disease. Spray on a regular schedule, once every 10 days, for a total of 7-8 sprays. If you are worried about the leaves turning yellow, you can also add a little ferrous sulfate to it.

Rhododendron lace bug

This insect is also fairly common. Although this plant is toxic, that does not affect the survival of this insect. They mainly gather on the underside of leaves to feed, causing the entire underside to become discolored. If control is not timely, the entire leaf may turn white and the leaves may drop early, so you need to observe carefully. You should prevent it before planting: first clear away all the weeds and fallen leaves in the soil, then kill all the overwintering eggs with chemicals. If symptoms appear, promptly remove the diseased leaves, dispose of them, then treat with a specific chemical.

Red spider mite

This is also one of the more common types of pests and diseases. Spots will appear on the leaves that have been sucked on, and in severe cases of feeding the entire leaf will drop off. The higher the temperature, the more likely they are to appear, especially when it is both dry and hot. But in rainy weather it is not so serious, so you should replenish water in time. In winter you should promptly kill the pests and diseases, and when the damage occurs in March you should continue spraying.