What are the latest pest and disease control methods for bitter lettuce?

Bitter lettuce tastes slightly bitter and can be stir-fried or served cold; it is an excellent choice for clearing heat and reducing internal fire, and because of its heat-clearing and cooling effects, it is highly praised by consumers on the market. As market demand for it grows, its planting area is also increasing year by year, but the damage from bitter lettuce pests and diseases is also rising. So what pests and diseases does bitter lettuce have during cultivation? Let's take a look at the control methods.

1. Downy mildew

Downy mildew is a fungal disease that mainly damages the leaves. The pathogen overwinters in diseased plant debris and soil, and in the following year the pathogen germinates and causes disease. When the disease occurs, irregular chlorotic or pale yellow lesions appear on the leaves, and a white downy mildew layer appears on the underside of the leaves. As the disease progresses, the lesions expand and cause the leaves to die. When the disease is severe, all the leaves of the plant die, making it unusable and causing great losses.

Control methods: Before planting, clear away diseased plant debris from the field, and also disinfect and sterilize the soil to thoroughly eliminate overwintering pathogens. When the disease occurs, spray with Kelu and Saidefu preparations for control, spraying once every 7-10 days, for 2-3 consecutive times.

2. Viral disease

Viral disease, as the name suggests, is a viral disease that can harm the entire plant. After it occurs, the plant becomes stunted, the leaves are small and uneven in color, and it is noticeably shorter than normally growing plants. It is mainly spread by virus-carrying seeds and by aphids, and it mainly occurs during periods of high temperature, little rain and drought.

Control methods: When sowing, treat the seeds with chemical seed dressing to eliminate viruses carried by the seeds. During cultivation, keep the soil moist and water appropriately, neither too much nor too little. Remove diseased plants promptly and carry them out of the field. When the disease occurs, spray chemicals for control, and at the same time control aphids well to cut off the transmission route.

3. Brown rot

Brown rot can harm both seedlings and mature plants. In seedlings it mainly affects the root and stem base, causing the root system to turn brown and constrict, and finally leading to death. When mature plants are infected, the root and stem base turn brown and rot, causing the plant to wilt. In humid environments, white spiderweb-like mold appears at the affected area.

Control methods: Treat the seeds before sowing; you can dress them with Puhaiyin before sowing. Choose a plot with flat terrain that is loose and well-drained for planting. In the early stage of the disease, spray with thiophanate-methyl, difenoconazole, vinclozolin and other chemicals for control.

4. Aphids

Aphids are a pest of many crops. They gather in groups on the leaves of bitter lettuce and constantly suck the sap. In severe cases, they cause the leaves to shrink and wither, affecting the edible leaves. In addition, they are also a transmission vector for other diseases.

Control methods: Use pesticides such as Keyaxing, pirimicarb, and fenvalerate for control, and use them alternately to prevent aphids from developing resistance and affecting the control effect.

The above are the pest and disease control methods for bitter lettuce. We hope they can help you. To learn more related content, please stay tuned to us.