Ozone how to control greenhouse vegetable pests and diseases and what to pay attention to

1. Advantages of ozone in the prevention and control of pests and diseases.

1. Safe and efficient, low cost. Ozone can be used for multiple purposes at the same time, and the control cost is low. Compared with spraying pesticides, ozone application is more convenient, efficient and safer, which can greatly reduce the use of pesticides and avoid vegetable farmers from applying highly toxic and high-residue pesticides, thereby reducing the cost of medication.

2. Pollution-free. Ozone is unstable in dry air and can be quickly decomposed and reduced to oxygen, so there is no pollution and no residue in the plant and fruit, which is an important way to achieve pollution-free vegetable production.

3. Improve quality and increase production. After the experiment, the deformed fruit of greenhouse tomato was significantly reduced after the use of ozone, and the yield increased by about 20%, and the fruit was large, with good coloring and good taste.

Second, how to use.

1. Seed treatment. The ozone gas is introduced into clean water and stirred constantly, and the ozone solution is prepared after 10 minutes. Soak the seeds for 15-20 minutes to kill viruses, germs and eggs on the surface of the seeds.

2. Greenhouse pest control.

Disinfection of the smoke shed. 10 days before planting, the ozone generator can be used to concentrate ozone in the shed in combination with the high-temperature stuffy shed, and the application time should not be less than 2 hours. Control of seedbed pests and diseases.

The seedbed is sealed tightly, applied for 1 minute each time per 10 square meters, and fumigated for 10 minutes, and then ventilated for 30 minutes. Facility pest control after vegetable colonization. After planting and slowing seedlings, ozone is continuously applied to each mu of sheds for 7-10 minutes, then closed fumigation for 15-20 minutes, and then ventilation for 30 minutes.

The pest-free shed is applied once every 5-7 days, 5 times in a row, and the time is increased by 5 minutes every 2-3 times until it is increased to 25 minutes per mu each time. The fumigation time is also increased by 5-10 minutes every 2-3 times. Experiments have proved that ozone has a good control effect on tomato gray mold, leaf mold, early blight, late blight, cucumber downy mildew, blight, etc., as well as greenhouse whitefly, leaf miner fly, aphid and other diseases and insects.

However, it has no effect on the pests and diseases in the greenhouse soil because the amount of ozone gas seeping into the soil is too small and the concentration is too low.

3. Reasonably determine the amount of application and fumigation time.

The amount of ozone application and the fumigation time of closed sheds should be adjusted appropriately according to different crops and their growth periods. In general, crops at the mature stage are more adaptable to ozone than those at the seedling stage. If the amount of ozone is too large or the fumigation time of the greenhouse is too long, it will cause the leaves and flowers of the greenhouse to be poisoned and dried up, and the heavy will cause the death of the plant.

With the growth of the plant, the application rate and fumigation time can be gradually increased to achieve the purpose of controlling pests and diseases without harming vegetable crops. When releasing it, it should be as uniform as possible, and the air vent should not be directly facing the vegetable, and should be more than a meter away from the vegetable plant. After the fumigation time arrives, it should be ventilated in time, and the general ventilation time should not be less than 30 minutes.

During the fumigation of the shed, it is strictly prevented from entering by humans and animals, so as not to cause poisoning or other adverse reactions.

Greenhouses have two characteristics: the temperature is higher than that of the outdoors and no heat dissipation. The glass flower house and vegetable greenhouse that we can see in life are typical greenhouses.

The use of glass or transparent plastic film to make a greenhouse is to let sunlight directly irradiate into the greenhouse to heat the indoor air, and the glass or transparent plastic film can prevent the indoor hot air from being emitted to the outside, so that the indoor temperature is kept higher than the outside state, so as to provide conditions conducive to the rapid growth of plants.

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