Disease and Pest Control of Lily and Azalea

Leaf swell

This disease occurs quite frequently. At the beginning, some round spots will appear on the front of the leaves, which are basically light yellow in color. If not treated in time, the color will become more yellow. The most obvious part is the back of the leaf, which is fat and swollen and has a light yellow color. If not handled properly, the petiole may also become diseased and may become deformed and thickened. Finally, the diseased part will turn black and then dry up and fall off.

When you first see the white powdery substance, you should quickly remove the affected area and then burn the affected area to prevent the bacteria in this area from spreading to other parts. Before germination, it is best to spray some medicine to reduce the chance of disease.

Leaf spot

This disease is relatively common. Dark brown spots will appear on the leaves. In severe cases, the entire leaf will wither and fall off. Since this disease is very likely to occur, it is best to choose varieties that are not prone to the disease. Moreover, prevention and control should be carried out before it occurs. You need to spray some disease-preventing mixed liquid medicine first. This operation is best done between May and August. Once similar symptoms are found, management should be strengthened and the pesticide should be sprayed continuously 7-8 times, once every 10 days. In order to prevent them from turning yellow, a little ferrous sulfate can also be added.

Currency sickness

When encountering this disease, a relatively dense white or pink layer will appear at the diseased location, and mite galls may also form on the leaves. This is mainly because the places where aphids and other small insects have gnawed are infected with bacteria, so the prevention and control of aphids should also be taken as seriously as possible. As with the other diseases mentioned above, if diseased leaves are found, they should be removed and burned immediately, and then the pesticide should be applied.