Garlic spring rot symptoms
Garlic spring rot mainly harms the base of the lower leaf body. Initially, the water-soaked softening lesions appear, and when they are enlarged in the upward and downward directions, they are light brown rot. In the middle and late growth stages, the heart leaves are affected, and the softening and decaying spreads under the stems. Sometimes it can cause new bulbs to rot. After the onset of the leaves, the number of leaves decreased and the bulbs were blocked. The sheath of the sheath close to the ground is sick, the bulb is cleft, and the quality is degraded.
Garlic spring rot pathogen
The pathogens of the disease are rod-shaped bacteria, and their ecological characteristics have yet to be ascertained. The pathogen survives in the soil and may behave in the same way as vegetable soft rot. Ice and snow can be melted and can continue until mid-June, while the low temperature and wet years can last until the harvest period. Often occurs in low temperature and rainy periods. In the case of good weather, the condition weakened, and then the rain again spread again. After the strong wind, the incidence of rainfall was more.
Garlic spring rot prevention
Seed treatment
The garlic is treated with 50% thiophanate-methyl WP or 30% chlorpyrifos to sown the garlic. The specific method is: mix 0.5 kg of pharmacy with water 3-5 kg, mix 50 kg of garlic, and dry it for sowing.
2. Rotation
Because the field of continuous cropping is easy to be ill, the continuous cropping of the field with non-garlic crops is 3-4 times, which can effectively prevent and cure the disease, and the effect is obvious, and the control effect can reach more than 90%. Appropriate amount of chitin can be applied to improve the soil environment and prevent the occurrence of root-knot nematodes.
3. Field management
In the early spring, the topdressing and seedlings are carried out, the soil is loosened, the shovel is drained, the growth of garlic is promoted, and the disease resistance is improved. It is found that the diseased plants are excavated and burned in time, and the manure is strictly prohibited to prevent the bacteria from being brought into the field.
4. Chemical control
At the beginning of the disease or at the beginning of the spread, 30% methyl carbaryl 1500-2000 times solution, or 78% pol Mn-Zn wettable powder 500 times solution, 50% chlorobromoisocyanuric acid soluble powder 1200 times solution, 53.8% copper hydroxide dry suspension 1000 times liquid spray control, 7 times a day, spray 2-3 times, the effect is very good.
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