Diseases of honeysuckle

Brown spot is a common disease in leaves, resulting in the weakening of plant growth. Most of the disease occurred in the middle and later stages of growth, and it was at its peak in August and September, and it was serious under rainy and humid conditions. Brown dots were formed on the leaves at the beginning of the disease, and then enlarged into brown round or irregular spots. There are gray-black mildew on the back of the disease spot, and the leaves fall off when the disease is serious, affecting plant growth and flowering. Control methods: cut off the diseased leaves, then spray them with 1 ∶ 1.5 ∶ 200 Bordeaux solution, once every 7 to 10 days, 2 to 3 times continuously.

Powdery mildew is serious in warm, dry or shady conditions. At the initial stage of the disease, white dots were produced on the leaves, and then gradually expanded into white powder spots, which continued to spread all over the leaves, causing leaves to yellowing, wrinkling and deformation, and finally causing falling flowers, fallen leaves and branches to dry up. Prevention and treatment methods: treat the diseased and residual plants in time; spray 50% topiramate 1000 times liquid during the occurrence period.

The disease spot of anthracnose leaves is nearly round, and when it is wet, the leaves are covered with orange-red spot-like sticky material, which is a large number of conidia. Control methods: ① removed the residual and diseased leaves and burned them centrally; before transplanting, ② soaked the seedlings with 1 ∶ 1 ∶ 150 × 200 Bordeaux solution for 5 to 10 minutes; during the onset of ③, 65% Dysen zinc 500 times solution or 50% acetaminophen 800-1000 times solution.

After the injury of rust, tea-brown or dark brown spots appear on the back of the leaves; some near-round disease spots appear on the surface of the leaves, and there is a small blister in the center, which can lead to leaf death in severe cases. Prevention and treatment methods: after ① collection, withered plants and diseased leaves were removed and burned; at the initial stage of the onset of ②, 50% dinitrate powder was sprayed with 1000 times liquid, once every 7 to 10 days, 2 to 3 times successively.