Control methods of diseases and insect pests of Artemisia annua

Artemisia annua L., also known as Artemisia annua L., Artemisia ann At present, there is also artificial cultivation, but the cultivation of diseases and insect pests seriously affect the yield and quality, causing economic losses to drug farmers, the following with the editor to take a look at the prevention and control of Artemisia annua diseases and insect pests.

1. Sudden collapse disease

It is a fungal disease, the pathogen is Rhizoctonia solani, which mainly harms the seedlings. When the disease occurs, there are water-like disease spots at the base of the stem of the seedlings, which will spread around the stem and gradually constrict in a thin line, resulting in the seedlings losing their support and falling to the ground. If the ground is wet, white filaments will appear at the base of the stem.

Prevention and control methods: the disease mainly harms seedlings, generally carrying bacteria in soil or seeds, and harms seedlings after emergence, so it is necessary to disinfect seeds and soil before planting. Generally, the disease occurs in March, and Metalaxyl manganese zinc can be sprayed before and after the disease, which has a better prevention and control effect.

2. Stem rot

The disease mainly harms the rhizome, after the disease, the leaves of the lower half of the plant began to turn yellow and dry, gradually rotting, black or brown disease spots appeared at the base of the stem, slightly sunken, and gradually rotted, and finally the plant fell down and died. The disease is very easy to attack in the environment of high temperature and humidity, and the onset is very sudden and rapid.

Prevention and treatment methods: spray the mixture of carbendazim and mancozeb in time, or spray thiophanate methyl or dimethyl bacteria.

3. Powdery mildew

It is also a fungal disease, which is easy to occur in high temperature, high humidity and poorly ventilated plots. The onset time is generally from June to July in summer. The disease becomes mainly leaf and also spreads to the stem. The gray-white powder appeared in the leaves during the disease, which seriously affected the photosynthesis of the leaves and led to the weakness of plant growth.

Prevention and treatment: Metalaxyl or methyl topiramate can be sprayed once a week for 2-3 times in a row.

4. Ground tiger

March is the peak of the ground tiger, which lurks in the soil and feeds on the roots of the seedlings, often biting off the seedlings. The young insects are active all day, and it is not easy to find them. After the 3rd instar, they will lie dormant day and go out at night. In severe cases, a large number of seedlings will die due to root failure.

Control methods: the adults can be trapped and killed by black light and frequency vibrating insecticidal lamp, and the 1st-3rd instar larvae can be sprayed with phoxim EC.

The above is the introduction of the prevention and control methods of Artemisia annua diseases and insect pests, hope to help you, want to know more related knowledge, please pay attention to us.