How to prevent and rescue crop phytotoxicity?

The problem caused by the improper use of pesticides is now more and more serious, which has seriously affected the crop production of China and the major hidden dangers of the quality and safety of agricultural products. So how do you prevent and rescue crop phytotoxics?

Why does the use of pesticides improperly cause phytotoxicity

Chemically synthesized pesticides are used to kill insects and prevent weeds. Because they have no affinity with the crops themselves, they will affect crop metabolism and reduce the autoimmune function of crops. Therefore, improper use of pesticides can cause crops to produce hidden pesticides or contact-killing chemicals that are difficult to detect, which can inhibit crop growth and lead to malnutrition.

In summary, there are four problems that affect the rational use of pesticides, one is the quality of the drug, the second is the use of technology, the third is the spray machinery standard, and the fourth is the standard spray machinery use technology. In addition, natural environmental conditions such as low temperature, high temperature and drought, salt and alkali, etc., can also cause phytotoxicity or aggravate phytotoxicity.

The type of injury

Pesticide phytotoxicity is divided into hidden phytotoxicity and expressive phytotoxicity. Recessive phytotoxicity is caused by systemic pesticides. The symptoms of phytotoxicity are generally not obvious. They often inhibit crop growth under low temperature conditions. The leaves are dark green, and then they are exposed to high temperature, and they are late for maturity, resulting in crop yield and quality. decline. The performance of herbicides in expressive herbicides is obvious and easy to identify. Under high temperature conditions, the application usually shows symptoms such as burn spots and leaf burnt leaves.

Excessive use of pesticides and improper use can cause phytotoxicity

The amount of pesticide used in crops is too large. After application, it encounters adverse natural environmental conditions such as low temperature, high humidity and drought. The crops are slowly metabolized and the phytotoxicity is aggravated. Plant protection machinery is not standard, spraying is not uniform, excessive application will cause phytotoxicity. Synthetic plant growth regulators, excessive or repeated use will break the hormone balance in plants, leading to imbalance of enzyme metabolism, inhibiting crop growth, decreased immune function, and increased disease.

The remedy injury occurred after the crop

After the phytotoxicity of the rice seedbed, every 100 square meters is sprayed with 3 grams to 6 grams of water to 15 kilograms to 30 kilograms + "Bai Hu partner" 3 ml ~ 6 ml + edible vinegar 50 ml ~ 100 ml. Can quickly remove the phytotoxicity.

After the discovery of phytotoxicity in soybeans, corn, rice, potato, flax, red beans, cowpeas, vegetables, etc., the use of "Bi protection" 3 grams of water with 15 kg of foliar spray; or acres with "Bi protection" 2 grams of water 10 kg + 3 ml "Bai Hu partner" + vinegar 30 ml ~ 50 ml for foliar spray.

After the fruit tree has phytotoxicity, the mu is used with â€œBei Huâ€ 9g~12g (1g â€œBihuâ€ is 5kg with water, and it is mixed with 5000 times liquid) foliar spray; or â€œPuibaoâ€ 6g~9 Gram (5000 times liquid) + "Bai Hu partner" 15 ml ~ 20 ml + 100 ml of vinegar, stir evenly and then spray on the leaf surface, which can obviously relieve the effect.

Use â€œBi-protectionâ€ to recommend the dosage, spray evenly, usually 10 to 15 days.

Application Technology

Choose the appropriate spray droplets and density. Spraying â€œBibaoâ€ should consider the effects of meteorological conditions (such as volatilization, drift, wind) in production, and also consider the spraying time of spraying droplets on the foliage of plants to facilitate penetration, absorption and spraying of droplets. The diameter is less than 200 microns, which is susceptible to the loss of volatilization and drift. The diameter of the spray droplets larger than 500 microns is difficult to adhere to the foliage of plants, and it is easy to roll to the ground and reduce the efficacy. The suitable spray droplet diameter is from 250 micrometers to 400 micrometers, and the droplet density is 30 to 40 square meters per square meter.

The amount of liquid spray is selected according to the spray droplet diameter and the droplet density. Spraying â€œBai Huâ€ with a manual knapsack sprayer and a mobile mist sprayer is 15 kg to 20 kg of water per acre. Spray the â€œBi-protectionâ€ spray volume from 10 kg to 15 kg/mu with a sprayer sprayer; the spray volume of the aircraft is from 2 kg to 6 kg/mu, and determine the amount of spray according to the characteristics of the agricultural aircraft. Spraying high-stalk crops depends on the size and density of the droplets to determine the amount of liquid sprayed.

Weather condition. The suitable temperature for spraying â€œBi-protectionâ€ is 13Â°Cï½ž27Â°C, the relative humidity of air is more than 65%, and the wind speed is less than 4m/s. Generally, the spraying effect is best before 9:00 am, 4 pm and no dew at night. . Under low temperature or high temperature and drought conditions, the metabolism of crops is slow, which will reduce the absorption and conduction speed of â€œBai Huâ€ and affect the efficacy of the drug.

"Bi-care" and other pesticides, fertilizers, mixed Notice

A large number of tests have proved that â€œBibaoâ€ has synergistic effects with pesticides, fungicides, seed coating agents, acaricides, nematicides, chemical fertilizers, foliar fertilizers, and microecological preparations. Solve the problem of pesticide resistance, but "Bai" can not be mixed with alkaline substances. â€œBai Huo Companionâ€ uses 3 ml per 15 kg of water. When mixing with pesticides and foliar fertilizers, it should be thoroughly stirred. After 30 minutes, it is best to spray, but the mixture should not be placed for more than 48 hours.

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December 05, 2023