How to control broad bean pests and diseases? Control methods for aphids and chocolate spot

Broad bean is one of the earliest legume crops cultivated by humans. When planting, many growers do not pay attention to broad bean pests and diseases, resulting in severe yield reductions, and in some areas they occur year after year. So how should broad bean pests and diseases be controlled? Let's take a look at the detailed introduction.

1. Chocolate spot

Field temperature and humidity have a great influence on this disease. It mainly occurs during the flowering stage of broad bean. High planting density, poor drainage, and soil nutrient deficiency can all cause this disease. When the disease occurs, multiple lesions appear on the leaves and gradually expand. The lesions are red, reducing leaf function and nutrient synthesis, leading to poor plant growth.

Control methods: Choose varieties with strong disease resistance, plant at an appropriate density, control the application of nitrogen fertilizer, rotate with gramineous crops for more than 2 years, and promptly clean up diseased residues after harvest, burying them deeply or burning them.

2. Fusarium wilt

Fusarium wilt is a relatively common disease of broad bean. It can cause damage from the seedling stage to the flowering stage. When the disease occurs, the leaves turn pale yellow and wilt, the top leaves wilt, the leaves fall off, the root system also turns black, there are fewer lateral roots, and in severe cases the root system rots and the plant is very easy to pull up.

Control methods: Before sowing, soak the seeds in carbendazim solution for disinfection. In the early stage of the disease, carbendazim, propiconazole emulsifiable concentrate, thiabendazole, and other agents can be used to drench the roots, with good results.

3. Viral disease

This disease mainly damages the mosaic parts of the plant. After the leaves are infected, vein clearing appears. It is mainly transmitted by aphids and seeds. Virus-carrying seeds and virus-carrying aphids are the main sources of infection. When the disease occurs, the leaves shrink, as if scorched, lose photosynthesis, and cannot synthesize nutrients.

Control methods: Choose seeds that do not carry the virus for sowing. During planting, disinfect the seeds and seedlings, and at the same time control aphids well to prevent the spread of this disease.

4. Aphids

Aphids have extremely strong reproductive capacity and can reproduce more than a dozen generations in a year. Generally, adults and nymphs gather on the tender leaves at the top shoots of broad bean, sucking sap, causing broad bean to grow slowly. At the same time, they can also transmit viruses and reduce yield.

Control methods: Aphid control should be done early, and they should be eliminated as much as possible before damage occurs. Control agents include chlorpyrifos emulsifiable concentrate, imidacloprid, and other effective options. Any one can be selected and sprayed once every 7-10 days, for 2-3 consecutive times.

The above is an introduction to the control methods for broad bean pests and diseases. We hope it can help you. If you want to learn more related knowledge, please stay tuned to us.