Common diseases and pests of cosmos and their control

Common diseases and pests of cosmos and their control

Common diseases of cosmos and their prevention and treatment

The common diseases of cosmos are brown spot disease, powdery mildew and grass stem blight. Among them, grass stem blight is the most common, which mainly harms the stems and leaves of cosmos. Its symptoms are: in the early stage of the disease, rash-like protrusions appear on the plant stems, which are gray in color, fusiform or round in shape, and in the later stage, the rash-like protrusions will crack. Grass stem blight also occurs frequently during the growing season of cosmos, and in severe cases can cause the plant to die.

Prevention and control methods: ① Carry out drainage work in time after rain to prevent moisture retention. ② When spraying medicine in the early stage of the disease, you can choose a specific solution of benomyl-cyclohexine emulsifiable concentrate, thiophanate-methyl suspension and green depo suspension. The spraying cycle is seven days, and spray 2 to 3 times.

Common pests of cosmos and their control

The common insect pest of cosmos is mainly red spider mites. Red spider mites will suck the juice from the stems and leaves, which reduces the moisture in the affected parts. The leaf surface will appear densely packed with pale spots, and the leaves will curl and turn yellow. In severe cases, the plant may develop yellow leaves. Leaves may curl, burn, fall or even die. Red spider mites are also a vector of viral diseases.

Prevention and control methods: Strengthen cultivation management. In the early stage of insect pests, you can use 20% trichlorodicofol emulsifiable concentrate at 500~600 times for prevention and control.

Mauve has certain medicinal value. It is mainly used to clear away heat and detoxify, relieve cough and reduce phlegm, treat wind-heat colds, dysentery, costitis, stomatitis and other diseases.

The medicinal value of cosmos is so high, flower lovers should take good care of cosmos and try not to let it be invaded by diseases and pests!

<<:  Diseases and Pests of Money Tree and Their Control

>>:  What to do if Monstera suffers frost damage

Recommend

How to plant copper coin grass? Planting time and method

Planting time of copper coin grass The cultivatio...

When and how to plant kale

Kale Planting Time When sowing kale, you must cho...

Can dragon fruit be grown in sand?

Can dragon fruit be grown in sand? Dragon fruit c...

Disease and insect pest control of Thousand-petal sunflower

1. About pest control In addition to the common w...

Learn these 3 tricks, and your bougainvillea tree will be full of 100 flowers!

Bougainvillea lacks light, has few flowers and sp...

What to do if lily leaves turn yellow

1. Reasonable watering Excessive watering, includ...

Which month is suitable for planting red

When to plant red snapdragon Impatiens is general...

When is the right time to plant okra?

Best time to plant okra Okra is usually best plan...

How many years does it take for a ginseng fruit tree to bear fruit?

Introduction to Planting Ginseng Fruit Trees The ...

Lina Lian's FAQ

What to do if Lina lotus root rots Root rot is a ...

How to propagate pansy by cuttings

1. Cutting time Before taking cuttings, you must ...

Breeding methods and precautions of white phoenix

1. Soil To grow white phoenix, you need to use lo...

How to prune and deal with Kalanchoe after its flowers fade

1. How to prune Kalanchoe after the flowers fade ...

How does the Bilei drum explode?

1. Soil suitability In order to make the hibiscus...