How to prevent and cure soybean pests and diseases commonly encountered in soybean planting
Soybean planting common pests and diseases How to prevent and control soybean pests and diseases? Soybean root knot nematode prevention and control methods, the female camp parthenogenesis, it is generally considered that males have little effect. The growth rate of Meloidogyne incognita on soybean is lower than that of suitable host. On soybean, the temperature is 24-35 °C, and the soybean is 3-4 generations. The first generation is the most harmful. The root-knot nematode is vertically distributed in the soil up to 80 cm deep, but 80% of the nematodes are in the 40 cm soil layer.
In addition to parasitic soybeans and peanuts, it can damage more than 80 plants in 14 families. The roots of the beans are stimulated by nematodes, forming nodular tumors. The size of the tumors varies, and the shape is different. Some are small like rice grains, some form "roots clusters", the surface is rough, and the tumors are wired. The diseased plant is short and the leaves are yellowed. In severe cases, the plants are wilting and dead, and the fields are yellow, yellow, green and green.
Control method:
(1) Rotation with non-host plants for more than 3 years. Effective rotation based on the identification of local root-knot nematode species. The northern nematode distribution area and grass crop rotation. The southern root-knot nematode area should be rotated with peanuts and cannot be rotated with corn and cotton.
(2) Select anti-nematode disease varieties according to local conditions. It is not appropriate to use the same disease-resistant variety continuously in the same area for a long time.
(3) Chemical control.
1 seed dressing, usually containing carbofuran.
2 soil application, 3% carbofuran granules to treat the soil. Generally 150-180 kg of carbofuran granules per hectare.
(4) Biological control. Soybean root-preserving agent requires 1,500-2250ml of soy seed per hectare for seed dressing, which is better at high dose. It can also be mixed with 1050 kg per hectare. In addition, the use of Bean Feng No. 1 bio-defense granules, 75-150 kg per hectare, mixed with the seed fertilizer.
Symptoms of soybean powdery mildew:
The pathogen is born on both sides of the leaf, and the mycelium is permanent. The diseased spot on the leaf is round, with a dark green halo, and soon it is covered with white powdery flora, which is the conidiophore and conidia of the pathogen. Later, it grows spherical on the white mold layer, and the dark brown closed capsule.
Soybean powdery mildew prevention and treatment methods:
1. There is a significant difference in disease resistance between varieties, and resistant varieties should be selected.
2. Rational application of fertilizer to keep the plant robust.
3, timely spraying 25% carbendazim 500-700 times in the early stage of the disease, can reduce the incidence.
After the soybean seedlings were damaged, the plants were short, and the young leaves withered and drooped early. The leaves often have reddish-brown streaks along the veins, which turn dark brown. The affected petiole gradually darkens from top to bottom, sometimes concave or longitudinally on one side, usually twisted to make the leaves reverse sagging and wilting.
When the base of the petiole is damaged, it becomes black and thin, and the entire petiole hangs down. Most of the stems are on the new shoots. The pods are mostly brown from the edges or pods, and the distortion is not deformed. The diseased pods are firm, but the beans are thin and black. A large number of yellow-white powdery particles are produced in each of the damaged parts, and the particles are often aggregated or combined into a block.
Control method:
1. Select seedless seeds and seeds for disinfection. Establish disease-free seeding fields and keep seeds from disease-free land. With 50% of the seeds mixed with 0.3% of the seeds, it has a good effect on seedling protection and disease prevention.
2. Implement a rotation of more than three years.
3. After the autumn harvest, the diseased plant residues in the field are cleared, and the sterilization source can be turned off in time to reduce the incidence.
4. Quarantine. Shame disease is very harmful. At present, this disease occurs only in a few provinces. All localities should conduct a general survey and strictly quarantine and prevent the spread of diseased seeds into disease-free areas.
This article URL: How to prevent and cure soybean pests and diseases commonly encountered in soybean planting
Household use of lifting equipment
Intelligent home lifting table is a kind of office furniture with highly adjustable and intelligent functions. It can automatically adjust the height and Angle according to the user's needs, improving work efficiency and comfort. According to different functions and usage scenarios, smart home lifting tables can be divided into the following categories:
1. Living room lifting table: mainly used for family living room, can automatically adjust the height and Angle according to the user's height and dining needs, improve comfort.
2. Washbasin lifting table: mainly used in family washroom or balcony, can automatically adjust the height and Angle according to the user's inconvenience factors demand, improve the use of comfort.
Comfortable Furniture,Electric Adjustable Desk,Smart Lift Table,Furniture Table
Suzhou Herstar Medical Technology Co., Ltd. , https://www.hosunherstar.com