Concentration
When spraying with a liquid agent, it is often necessary to formulate or dilute the agent to a suitable concentration. If the concentration is too high, the phytotoxicity and waste concentration are too low. Some non-wettable or difficult-to-wet powders should be added with a little water to make the powder into a paste and then added with water. Some moisturizers can also be added during preparation.
Second spraying time
If the spraying time is too early, it will cause waste or reduce the preventive effect. If a large number of pathogens have invaded the host, even if the sprayed therapeutic agent is not effective, it should be based on the disease law and the current situation or according to the short-term prediction. Spray protection at the time of onset.
Three spray times
The number of spraying is mainly determined according to the length of the residual period of the drug and the meteorological conditions. Generally, spraying 10 times to 15 days after spraying a total of 2 times to 3 times after the rain should be considered for cost-saving medicine.
Four spray quality
If the amount of spray is too small, it will not be able to protect the plant parts too much. It will waste even the medicinal damage. The spray should be evenly sprayed. The front and back sides of the blades should be sprayed to the plants. .
Five phytotoxicity problems
There are many reasons for spraying phytotoxicity on plants. The water-soluble agents are prone to phytotoxicity. Different crops have different sensitivities to the medicinal agents. For example, Bordeaux mixture does not cause phytotoxicity, but copper-sensitive crops can also cause phytotoxicity. . Beans, potatoes, and cotton are sensitive to stone sulphur. The different developmental stages of the crop react differently to the agent. Generally, the seedlings and the flowering stage of the boot are susceptible to phytotoxicity. In addition, it is also related to meteorological conditions. Generally, the effects of temperature and sunshine are obvious, high temperature, strong sunshine, heavy fog, and high humidity are likely to cause phytotoxicity.
How to mix six
Generally, pesticides that are easily decomposed and decomposed by alkaline substances cannot be mixed with alkaline substances. For example, alkaline fungicides such as Bordeaux mixture and stone sulfur mixture cannot be mixed with 1605, dimethoate, dichlorvos and the like. The mixing of the chemical reaction to cause the phytotoxicity of the drug can not be mixed and applied, for example, the stone sulphur mixture and the 1605 mixture not only reduces the efficacy but also aggravates the phytotoxicity. Pesticides that cause emulsion damage or a large amount of precipitate after mixing cannot be mixed. Which specific agents can or cannot be mixed can be found in the instructions for use.
A small number of pesticides are mixed to increase synergy. For example, the synergistic effect of dimethoate neutral and acidic bactericidal properties such as zinc, wettable sulfur, colloidal sulfur, etc., is not affected, but may be slightly improved.
Seven drug resistance problems
Long-term use of a single agent (primarily a systemic bactericide) can lead to resistance to pathogens and render the agent used ineffective. In order to avoid this problem, different types of medicaments or systemic fungicides can be used alternately with conventional bactericidal mixture.
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