Cornflower Pest Control

Centaurea sclerotiorum

Symptoms: This disease mainly damages the base of the cornflower stem. When the temperature is high, light brown spots will appear on the cornflower stem. When it is serious, it will turn grayish white, and then part of it will rot. The stems and leaves will slowly wither and die. This disease is most likely to occur in spring and autumn under humid conditions with a temperature of about 15°C.

Prevention and control methods: Plants should not be planted too densely, and water and fertilizer management should be strengthened. If sick plants are found, they should be pulled out immediately. When the disease is serious, pesticides can be sprayed on the middle and lower parts of the plants.

Cornflower downy mildew

Symptoms: Irregular light gray-green to light red spots will appear on the surface of leaves infected with this disease, eventually causing the leaves of the cornflower to die.

Prevention and treatment methods:

① Observe more often and remove sick plants in time and dispose of them in a centralized manner once they are found.

② Cornflower plants should not be planted too densely. Ventilate frequently and pay attention to maintaining good ventilation and light conditions.

③ Chemical control: If the disease is serious, spray Bordeaux mixture or other chemicals for prevention and control.

Cornflower curl disease

Symptoms: The leaves of cornflowers infected with this disease will slowly twist, then shrink, and eventually cause vein necrosis.

Prevention and treatment:

① Usually, we should strengthen water and fertilizer management, ventilate and enhance light in time.

② Observe more frequently. If diseased plants are found, remove them immediately and destroy them in a centralized manner.