Common diseases and pests of Rhododendron tubulosa and their control methods

Rhododendron tubulosa

The dangers of leaf swell

When Azalea tubulosa is infected with leaf swollen disease, yellow round spots will grow on the front of the leaves, and a biscuit-like powdery layer will appear on the back of the leaves. The leaves will turn yellow and fall off soon. In severe cases, the spots on the petioles appear in patches, and when the flower buds are infected, the fleshy buds become thicker and harder.

Leaf swell disease prevention and control methods

The diseased leaves should be removed promptly and sprayed with Bordeaux mixture or Baume lime sulfur mixture.

Rhododendron tubulosa leaf spot

The harm of leaf spot

In the early stages of the disease, small reddish-brown spots appear on the leaves, which slowly develop into circular spots. In the later stages of the disease, the spots will connect into one, causing the leaves to turn yellow and fall off early.

Leaf spot control

Clean up fallen leaves in time in autumn, and pick off diseased leaves in time during the growing season; you can spray 1000 times diluted thiophanate-methyl to control the development of the disease, and adding ferrous sulfate can also prevent leaf yellowing.

Rhododendron tubulosa

The harm of currency sickness

The infected young branches and leaves have many white or pink mite layers, which are generally distributed at the top of the leaves, and sometimes mite galls will grow on the leaves.

Prevention and treatment of currency blight

Remove the diseased leaves and then spray with a solution containing copper sulfate.