Powdery mildew is a common disease in the production of strawberry, pepper, melon and other crops in winter and spring. The conventional control method is spray spray, but the spray increases the humidity in the shed, and to a certain extent is beneficial to the occurrence of diseases. In addition, most of the diseases are invaded from the back of the leaves, and it is difficult to ensure that the spray is deposited on the back of the leaves. Therefore, the control effect is not ideal. Sulfur fumigation is a green prevention and control technology for the prevention and control of powdered mildew in facilities. The advantage is that it is easy to operate, save time and labor, sublimate gaseous sulfur particles can be evenly distributed on the front and back of the target, improve control effect, and reduce chemical Pesticide dosage and application water consumption.
Electric sulfur sulphurizers are generally used in production to sublimate solid sulphur into sulphur particles and disperse and deposit them in a certain range of space for bactericidal action. Sulfur is low in toxicity to humans and animals and is almost non-toxic to bees. It is a plant protection product that can be used in organic food production.
How to use electric sulfur sulphurizer correctly to exert its maximum effect? Can be grasped from the following five points: 1. The number of 5-8 per mu. Studies have shown that fumigation machines have an effective fumigation distance of 6-8 meters, a coverage range of about 60-100 square meters, and a fumigation machine spacing of 12-16 meters can be used in field applications. 2. The height is 1.5 meters above the ground. When the fumigator is at this height, the deposition density of the sulphur particles on the back of the horizontal target is relatively high, which is favorable to the pathogenic bacteria on the back of the target crop leaf. The fumigator should not be too close to the shed film to prevent damage to the shed film. 3. Location 3-4 meters from the back wall. Due to the influence of gravity, there are more sulphur particles deposited at a distance of 1-3 meters from the fumigator. As the distance increases, the density of deposited particles becomes smaller. The north-south span of the hangar is generally 8 meters, so placing the fumigator in the middle position will facilitate the diffusion of sulphur particles. 4. The fumigation time is from 6 to 10 in the evening. Selecting this period of time fumigation is not only safe for personnel but also fully enclosed, and it can also avoid high temperatures at noon so as to avoid causing damage to crops. After the fumigation is over, keep the airtight chamber closed for more than 5 hours before ventilation. 5. Use about 20-40 grams of sulfur each time. The amount of sulfur should not exceed 2/3 of the carcass to avoid boiling overflow.
It should be noted that the wires and control switches in the shed should have moisture protection and leakage protection functions. The installation location should be 1.8 meters above the ground to avoid touching the operator.
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