Brown disease long black spot pod depression how to control pea brown spot

Pea brown spot is infected every year, which affects the appearance and quality of pea clip and makes it difficult to sell. This paper introduces the symptoms and control methods of pea brown spot.

Pea brown spot

First, symptoms of pea brown spot:

Pea brown spot is mainly harmful to leaves, stems and pods. Leaves infected with long light brown to black brown spot, the edge of the spot is obvious, there are large black spots on the tip of the spot. The stem is infected, the spot is brown to black-brown, spindle-shaped or oval; the pod spot is slightly sunken and extends inward, affecting the seeds.

Second, prevention and control technology:

1. Reasonable rotation: because brown spot infects not only peas but also other legumes, in order not to infect the pathogen in soil and crop residues, seriously diseased fields should rotate with non-legume crops for 2-3 years.

2. selection of disease-resistant varieties: high-yield, high-quality and disease-resistant pea varieties were selected according to local conditions.

3. Establish a disease-free seed land and collect seeds from disease-free plants: if you use your own seed, you should establish a separate seed land, strictly control the occurrence of all kinds of diseases and insect pests, and pick disease-free, robust and fully mature pods.

4. Seeds are strictly disinfected and strong sterile seedlings are cultivated: pea seeds are treated before sowing, and seeds are mixed with 70% methyl thiophanate wettable powder or 50% carbendazim wettable powder. Pea seeds can also be soaked in cold water for 4-5 hours, soaked in 50-55 ℃ warm water for 5 minutes, moved to cold water for cooling, dried and sown.

5. Select high dry land and reasonable close planting: high environmental humidity and high planting density can easily lead to the occurrence of brown spot, so it is necessary to choose land with high topography, good drainage and good soil permeability to plant peas, and strictly control the planting density according to the variety. Reasonable close planting.

6. Spray prevention and treatment: in the early stage of pea disease, use medicine in time. The medicine can be sprayed with 70% methyl thiophanate wettable powder 500 times and 75% chlorothalonil 600 times. Once every 7-10 days, 2-3 times in a row.