Following the previous issue of how to prevent garlic soft rot, this issue of Huinong.com will introduce the prevention and control methods of garlic stem rot.
First, what is garlic stalk rot?
Garlic stem rot is caused by the infection of Ascomycetes. The pathogenesis of the garlic plant is at the base of the garlic pseudostem.
In the early stage, the diseased part is watery, and the lesion becomes dark or grayish white. When the humidity is high, the diseased part becomes soft, the ulcer rots, the surface grows white wooly hyphae, and the decayed part has a strong garlic odor.
After the leaf sheath rots, the upper leaves gradually yellow and die, the roots of the garlic must be rotted, and the roots are rotted.
Second, what are the conditions for the occurrence of garlic stalk rot?
Generally, the temperature is around 20 ° C, and the relative humidity is above 85%, which is conducive to the occurrence of the disease.
When the temperature reached 6 °C in spring, the sclerotia gradually sprouted, and the temperature was around 14 °C, forming the first peak of dyeing. The peak incidence is mostly in late April.
In spring, there is a lot of rain or watering, and the relative humidity under the membrane is high, which often makes the condition worse. The terrain is low and the drainage is poor. |
Third, the comprehensive control method of garlic stem rot:
1. Agricultural control.
Rotating for 2-3 years, 2-3 years of garlic rotation for one year of wheat;
Use healthy and disease-free garlic seeds;
Remove the residual strain of garlic disease in time;
Sowing at the right time, rationally planting, applying enough base fertilizer to achieve a reasonable ratio of soil, fertilizer, nitrogen, phosphorus and potassium fertilizer, strengthen field management in time, and improve the disease resistance of garlic.
2. Chemical control.
Seed treatment: 50% carbendazim WP or 70% thiophanate-methyl WP can be used for autumn seeding. According to the amount of seeds 0.3%, spray the seeds evenly on the water, suffocate for 5 hours, dry and sown.
Soil treatment: After the whole hoeing, use 1 kg of 20% apricot phosphorus, mix 30 kg of fine soil, and then ditch.
Foliar spray: In the early stage of spring onset, generally in the end of March and early April, use 50% speed Keling WP 1500 times solution, or 50% carbendazim WP 600 times solution, spray control, spray 7-10 days 1 time, 2-3 consecutive times.
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