Now in the peak season of pesticide use, some farmers friends often use different pesticides for convenience, such as the combination of fungicides and insecticides , and the mixture of fungicides and fungicides. What should be paid attention to when mixing pesticides? Let's follow the Xiaobian to understand it.
First, several situations in which mixed or mixed use is required
1. Combination of fungicides and fungicides and insecticides
When more than one disease occurs on a crop at the same time, it is necessary to spray two different fungicides, sometimes it is sick and insects, and it is necessary to spray fungicides and insecticides. In order to save the number of sprays, it is usually taken Two fungicides or a combination of fungicides and insecticides. For example, in the cultivation of cucumbers, the whitefly or aphid and downy mildew, gray mold and the like often occur at the same time, and the agent for controlling whitefly or aphid (imidacloprid) and the agent for controlling downy mildew are generally used. Ingredients such as creamer and mancozebide or a drug for controlling gray mold (isourea, nicotinamide, fludioxonil). In the protected cultivation of tomatoes, whitefly and leaf mold, gray mold, late blight, etc. can also occur at the same time, and the insecticide can be mixed with the fungicide .
2. Combination of fungicide and biological growth regulator
In order to achieve the purpose of preventing disease or enhancing plant disease resistance, promoting plant growth or cultivating strong seedlings, a fungicide may also be mixed with a plant growth promoter. For example, farmers generally mix auxin 2,4-D with a fungicide for controlling gray mold (prochlorazenitrile, pyrimethanil, etc.) and then apply tomato flower buds (or scented flowers).
3. Combination of fungicide and foliar fertilizer
Foliar fertilizers and fungicides containing various trace elements and plant growth regulators necessary for plant growth or development may also be mixed, but it is to be noted whether their interaction is not harmful to the performance and action of the fungicide. The combination of fungicides with plant growth regulators or micro-fertilizers must also pay attention to the interaction between fungicides and growth regulators. It is best to compare them carefully beforehand to confirm that there are no side effects and then mix them together.
4, the combination of fungicide and tank mixing additives
Many surfactants such as silicone and bactericides can be mixed and used to improve the wettability of the liquid on the surface of the crop, increase the permeability of the agent and improve the effect. It is called barrel mixing aid, and the general dosage is 0.05%~0.10. %. Silicone surfactants are used in an amount of about 0.03% by weight, and are readily miscible due to their ease of degradation in water.
(Note: Some farmers like to mix and spray a variety of pesticides in one go in order to save the time of spraying, called "four in one", "one spray and more defense" ..., this method needs to be used cautiously, maybe It is dangerous or uneconomical, causing phytotoxicity to plants and wasting some of the chemicals that are not needed. Therefore, bactericides should not be mixed.
Second, the difference between mixed preparations and mixed use
The mixed preparation is different from the mixed use, and the mixed use is carried out by the pesticide user to mix the pesticides as needed. The mixture is a pre-processed commercial preparation. After the user buys the mixture, the composition of the active ingredient of the pesticide can not be changed. Therefore, the ingredients in the purchased mixed preparation can only be used once, no matter what is needed. All of them are spit out, and some pesticides that are not needed are sprayed onto the crops, which may cause waste and increase the pressure on environmental protection. When selecting pesticide mixture products, farmers should find out their formula composition to avoid waste.
Third, the precautions for mixing fungicides
Whether the fungicide can be mixed and whether the fungicide can be mixed with other drugs depends on the mechanism of action of the drug, the systemic conductivity, the complementarity of the control object, the antagonistic effect after the drug is mixed, the drug during storage and the preparation of the drug. Whether the physical and chemical properties are stable and safe for non-target organisms. After formulating a bactericide, add another bactericide or other pesticide (insecticide, plant growth regulator ) or fertilizer. If flocculation occurs or discoloration, delamination, bubble bubbles, etc. Do not mix with these pesticides or fertilizers.
Fourth, several situations in which drugs cannot be mixed
It is generally not possible to mix the same type of fungicide. Such as cream, manganese zinc (antivirus) and refined nail cream · mancozeb (jinlei), metalaxyl · mancozeb and gold, azoxystrobin (Amisida) and ether oxystrobin (Tribe), pyraclostrobin (Kai Run) and pyraclostrobin · Daisenlian (Bai Tai), fluopyram · fumfen (silfane) and fumulus (Plucker) , difenoconazole and myclobutanil, enoylmorpholine, mancozeb (an Mn-Zn) and enoylmorpholine, iprodione (cocaine) and vinyl nucleus, carbendazim and Thiophanate-methyl (methyl thiophanate). Mixtures containing mancozeb can no longer be mixed with mancozeb (Dasheng). Copper preparations can not be mixed with alkaline pesticides, and have antagonistic effects in combination with Fumei and Daisen fungicides.
Five, recommend several kinds of barrel mix
1. When cucumber downy mildew, powdery mildew and gray mold occur seriously, 68.75 % fluopyram · propofol (silofapril) suspension + 10% difenoconazole (Shigao) water dispersible granules +50% fludioxonil (Huiyou) wettable powder or 50% nicotinamide (pyridinamide) (Kaiser) water dispersible granules.
2, tomato late blight, gray mold, leaf mold, early blight occurs when heavy 68% refined metalaxyl · mancozeb (golden) water dispersible granules +32.5% azoxystrobin and diphenyl ether ring Azole (Ami Miao) suspension or Shigao + Huiyou or Niacinamide (Kaiser).
3, tomato gray mold, cucumber gray mold, strawberry gray mold, pepper gray mold occurs when heavy 50% nicotinamide (pyridinamide) (Kaiser) water dispersion granules +25% pyraclostrobin Ester (Kai Run) emulsifiable concentrate.
4, prevention and control of powdery mildew, gray mold, downy mildew, late blight 56% azoxystrobin chlorothalonil (Ami colorful) suspension, 32.5% azoxystrobin and difenoconazole (Ami wonderful) Suspension, azoxystrobin + difenoconazole + chlorothalonil, difenoconazole + chlorothalonil.
5, prevention and treatment of melon crop anthracnose: carbendazim + sulfur.
6, anti-virus and increase crop disease resistance: antiviral agents + foliar nutrients.
6. Determine the concentration of application in the tank mixture
In order to simultaneously control two or more diseases or both diseases and insects, the two components of the tank mixing should be applied in full. For example, both downy mildew and gray mold in the solar greenhouse, according to the recommended concentration, 68.75% fluopyram · propofol (silofapril) suspension 600 times solution and 25% nicotinamide (Kaiser) water The 1500 times solution of the dispersed granules is now mixed. In order to prevent and cure a disease, when the two fungicides are mixed, the concentration of the systemic agent can be lower than the recommended concentration, and the protective agent is at the recommended concentration to delay the occurrence of resistance of the target bacteria to the systemic agent.
Through the introduction of the above series, do you have a preliminary understanding of pesticide mixing? If you want to get more knowledge of pesticides, please pay attention to China Pesticide Network
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