Downy mildew and soft rot control on Onions
DJI Agras MG-1S
Onion is very beneficial to human health.
It contains prostaglandin A, which can reduce peripheral vascular resistance and blood viscosity. It can be used to lower blood pressure, refresh the mind, relieve stress, and prevent colds.
Onion
What we usually eat is the stem of an onion. Onions do not have taproots, but mainly string-shaped fibrous roots. During the reproductive growth period, onions will bloom and bear fruit. The flowers of onions are generally about 1 meter high in the air, cylindrical, and swollen below the middle. The inflorescences are umbel-shaped, many and dense, and the pollen is white.
Onion
Wentao Custom farming, established on February 12, 2017, is composed of a group of young people who love flying defense and agriculture. Since its establishment two months ago, they have used DJI MG-1S to provide wheat, cabbage, A total of 2700 acres of rapeseed and other crops are operated.
Job information
If traditional spraying is used, it will cause a certain loss of onion seeds. To address these issues, growers sent out job invitations to the team.
Operating parameters
| Altitude | 2.1M | Row distance | 5M |
| Amount per acre | 4.8L/Acre | Speed | 4.8M/S |
| Land Condition | Flat | Nozzles | XR11001VS |
| Date | 2017.05.09 | Temperature | 31℃ wind, 2m/s |
Common diseases of onion
Downy mildew can occur at all stages from plant seedlings to harvesting, and adult plants are severely damaged. It mainly damages the leaves and develops from the base to the upper leaves. When the air is humid, the back of the leaves produces a frosty mold layer, which can sometimes spread to the leaf surface. In the later stage, the lesions were withered and contiguous and were yellowish-brown.
The soft rot lesions spread upward from the petiole in sheets, and eventually, the leaf bulbs rot from the outside to the inside. When expanding upward from the root, the leaf ball rots from the inside to the outside, and it is milky yellow muddy, and smelly. Because the tissues of the roots and stem bases become brittle after being damaged, the leaf balls are easy to fall off, and they fall when touched. During storage, the leaf bulbs are easy to fall off or rot and the veins of the affected leaves turn dark brown.
Medication Information
In order to prevent the occurrence of diseases, after consultation with pesticide experts, the medication is as follows:
| Pesticide Name | Dosage form | Active ingredients and content | Acre Dosage |
| Pyraclostrobin, Tebuconazole, Brassinolide | Ultra-Low Volume Liquids | Pyraclostrobin. Tebuconazole: 10%,Brassinolide: 0.001% | Pyraclostrobin. Tebuconazole 54g, Brassinolide 60ml |
Fungicide efficacy calculation
Incidence rate before spraying = 11 shots of diseased seedlings / 200 shots of inspected seedlings × 100% = 5.5%,
Incidence rate after spraying = 0 shots of diseased seedlings / 200 shots of inspected seedlings × 100% = 0%
Disease reduction rate=(5.5%-0%)/5.5%×100%=100%
From the data, it can be seen that this work performed well. The use of drones to carry out plant protection operations on economic crops can ensure the effect and efficiency while avoiding the crushing of crops by machinery entering the field and ensuring farmland output. In this era of rapid development, we look forward to using technology to change the future of agriculture!