Control methods of diseases and insect pests of bitter chrysanthemum

Bitter chrysanthemum taste slightly bitter, can be fried or cold, is a good product to clear away heat, because of its heat-clearing effect, highly praised by consumers in the market. With the increasing market demand for it, its planting area is also increasing year by year, but the damage degree of diseases and insect pests of bitter chrysanthemum is also increasing. So what are the diseases and insect pests when planting bitter chrysanthemum? Let's take a look at the prevention and control methods.

1. Downy mildew

Downy mildew is a fungal disease, which mainly harms leaves. The pathogen overwinters in the diseased remains and soil. After the following year, the pathogen germinates and causes the disease. When the disease occurs, the leaves appear irregular chlorosis or light yellow disease spots, and the white downy mildew layer appears on the back of the leaves. With the development of the disease, the disease spots expand, resulting in the death of the leaves. When the disease is serious, all the leaves of the plant die, resulting in inability to use and great losses.

Control methods: before planting, it is necessary to clean up the disease and residues in the field, and disinfect and sterilize the soil to eliminate the overwintering bacteria completely. During the onset of the disease, Kelu and Sedford can be sprayed every 7-10 times for 2-3 times in a row.

2. Virus disease

Virus disease is known by name to be a viral disease, which can harm the whole plant. After the disease, the plant shrinks, the leaves are small and different in color, and the plants that grow normally need to be obviously dwarfed. It is mainly transmitted by seeds carrying virus and aphids, mainly in the period of high temperature, little rain and drought.

Control methods: when sowing, the seeds should be mixed with chemicals to eliminate the virus carried by the seeds, keep the soil moist during planting, and watering should be appropriate, not too much or too little. It is found that the diseased plants should be removed and taken out of the field in time, and chemical control can be sprayed when the disease occurs. At the same time, aphids should be well controlled and the route of transmission should be cut off.

3. Brown rot

Brown rot can harm seedlings and adult plants, the main rhizome of seedlings will cause brown constriction of seedling roots, and eventually lead to death, while when adult plants are infected, the rhizome will turn brown and rot, resulting in plant wilt. White arachnoid mold will appear in the disease.

Control method: treat the seeds before sowing, sow the seeds after mixing with hydantoin, and choose a flat, loose and well-drained plot to plant. In the early stage of the disease, thiophanate methyl, phenylether methyl, ethylene sclerotiorin and other agents can be sprayed to prevent and cure the disease.

4. Aphids

Aphids are pests of many crops, which will gather in groups on the leaves of bitter chrysanthemum and constantly suck sap, which in serious cases lead to leaf shrinkage and withering, affecting the consumption of leaves, as well as the transmission of other diseases.

Control methods: insecticides such as aldicarb, aldicarb and pyrethroid should be used alternately to prevent aphids from producing drug resistance and affecting the control effect.

The above are the pest control methods of bitter chrysanthemum, hope to help you, want to know more related content, please pay attention to us.