Wheat is the main large-scale grain crop in China. The occurrence of wheat root rot causes severe reduction of wheat production and even harvest. So what about wheat root rot? Let me introduce the pathogenesis and control measures of wheat root rot.
The whole growth period of wheat can cause disease, causing root rot during seedling stage, causing leaf spot, ear rot or black embryo in adult stage. The seed is seriously germinated, and the light can germinate. However, the young buds die in the soil after they leave the seed coat. Some can germinate and emerge, but the growth is weak. After the disease, the seedlings produced yellow-brown to brown-black spindle-shaped spots on the bud sheath, with clear edges and slight fading in the middle. After expansion, the roots, roots, tillers and stem bases browned, and the diseased tissue gradually became necrotic. Mildew, the last root is decaying, the wheat seedlings are laid flat on the ground, and the lower leaves turn yellow, and gradually die. The fusiform brown spot appears on the leaves of the adult stage, and then expands into a long oval or irregular light brown spot. Both sides of the lesion are gray-black mold. The lesions merge into large spots and die, and the whole leaves die. . Leaf sheath infection produces cloud-like plaques with inconspicuous edges, which are connected to the leaves and die. Brown spots and white ears appear in the onset of spikelets.
Pathogen and occurrence
Rhizoctonia solani, and a variety of Fusarium species such as Fusarium graminearum, Fusarium oxysporum, and Fusarium oxysporum are all subfamily fungi. The pathogens overwinter in the diseased bodies and soil with mycelium and chlamydospores, which became the initial source of infection in the following year. The bacterium survived for 2 years in the soil. Seeding of the seeds on the production can lead to the onset of seedling stage. The degree of seedling damage is aggravated with the increase of the amount of bacteria in the seed. If the source of infection is more, the incidence is heavier. Under the condition of seed-bearing, the degree of seed damage is more affected than the rate of infection. The soil temperature is low or the soil moisture is produced. Too low or too high is easy to develop, soil is thin or lack of water and water, disease resistance is reduced, and sowing is too early or too deep.
Control method
Use varieties that are resistant to root rot. Plant seeds without black embryos. The fermented organic fertilizer is applied, and the wheat is harvested and ploughed in time to make the sick tissue rot in the same year to reduce the source of infection in the next year. Carry out the rotation and change the time, and broadcast it in time. If the soil is too wet, it should be sown after soaking. If the soil is too dry, agricultural measures such as suppression and protection should be taken to reduce the damage. Seed treatment. The following agents can be used: 15% carbendazim·fumei double suspension seed coating agent 214-300g/100kg seed; 25g/L fluke nitrile suspension seed coating agent 140-200g/100kg seed; 23% tebuconazole·Fumei double suspension Seed coating 1:400-500 (drug ratio); 50% triazolone·fumei double suspension seed coating 100-125g/100kg seed. In the early stage of the disease, timely spraying to prevent and cure.
The best effect agents are: 50% different bacteria WP WP 60-100g/mu; 15% triazolone emulsifiable oil 40-60ml/mu 15% carbendazim WP 50-60g/mu; 25% ring The azole cream is 25-40 ml/mu and sprayed with 75 kg of water. During the flowering period of the adult plant, spray 25% propiconazole EC 4000 times liquid + 50% Fumei double wettable powder 100g/mu, and spray evenly on water 75kg. In the heading stage of the adult plant, 25% propiconazole emulsifiable concentrate 40 ml/mu + 25% triazolone wettable powder 100 g/mu can be used, and the water is sprayed 75 times for 1 or 2 times.
The medicine should be even and thoughtful, especially pay attention to the densely packed eggs on both sides of the main vein on the back of the leaf. For specific operations, spray until the tree is wet to drip.
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