This saves money and saves money with fungicides

There are a large number of pesticides in the pesticide varieties produced in China, and the phenomenon that the fungicides are mixed with fungicides or other types of pesticides is also common. The purpose of using mixed or mixed use is to expand the scope of prevention, delay drug resistance, increase efficiency, reduce the cost of medication, save labor and time. Mixing or mixing combination includes fungicide + fungicide, fungicide + insecticide , fungicide + foliar fertilizer , fungicide + biological growth regulator, fungicide + tank mixing aid (such as adding 0.03 % silicone surface active) Agents, generally use a protective fungicide in combination with a systemic fungicide, or mix fungicides with different mechanisms of action or mode of action. For example, refined metalaxyl + mancozeb, cumin, cyanide + mancozeb, enoylmorpholine + mancozeb, oxazolone + mancozebide provide both internal and external protection, ie broad-spectrum The protective fungicide mancozeb kills conidia (or zoospores) on the surface of plants to reduce the invasiveness of pathogens into plant tissues, thereby preventing the onset of disease, while refined metalaxyl, cymoxan, dimethomorph, Famoxadone can be absorbed by plant tissues, inhibiting the growth of conidial (or vesicular) germ cells that have invaded the plant tissue, or the growth of spores and mycelium, thereby playing a therapeutic role. The mixing of this model often has a synergistic effect while expanding the germicidal spectrum. Pyraclostrobin, azoxystrobin and other fungicides are respiratory inhibitors, which have a strong inhibitory effect on spore germination, and are mixed with mycelial growth inhibitors such as difenoconazole, fludioxonil and azole. It can also play a synergistic role. In a few cases, the same mechanism of action can also be processed into a mixture, for example, difenoconazole and propiconazole are all mixed by the pathogenic fungus sterol biosynthesis inhibitor, difenoconazole + propiconazole. 30% Ai Suspension Suspension is formulated by the complementarity of propiconazole and difenoconazole; both carbendazim and carbendazim are mitotic inhibitors of pathogenic fungi, and the spindles necessary for mitosis are affected. The synthesis of tubulin in silk, carbendazim + carbendazim formulated by 50% carbendazim WP was formulated by the negative cross-resistance relationship between carbendazim and carbendazim.

1. Several situations in which mixed or mixed use is required

Sometimes more than one disease occurs on a crop at the same time. Two different fungicides need to be sprayed, sometimes pests and diseases are required, and bactericides and insecticides need to be sprayed. In order to save the number of sprays, two fungicides are used. It is also a good idea to mix fungicides with insecticides. For example, in a cucumber cultivated in a protected area, whitefly or aphid and downy mildew, gray mold, etc. often occur at the same time, and the agent for controlling whitefly or aphid (imidacloprid) and the agent for controlling downy mildew (fine metalaxyl) are usually used. • Mancozeb) or a drug for controlling gray mold (isourea, nicotinamide, fludioxonil, etc.). In the cultivated tomato, both whitefly and leaf mold, gray mold, late blight, etc. can occur at the same time, and the insecticide and the fungicide can be mixed and used.

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, vegetable growers 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). 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. 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.

In order to save the time of spraying, some farmers like to mix and spray a variety of pesticides once and for all, called "four in one", "one spray and more defense" ..., this method needs to be used with caution, may be dangerous Or uneconomical, causing phytotoxicity to plants, wasting some of the chemicals that are not needed. Therefore, the bactericide should not be used arbitrarily.

2, fungicide mixture

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. At present, the fungicide mixture commonly used in vegetables is shown in Table 1.

3, the mixture of 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. The single agent for fungicides commonly used in vegetable production is shown in Table 2.

(1) Several situations that cannot be mixed

It is generally not possible to mix the same type of fungicide, for example, creams • manganese zinc (antivirus) and refined metalaxyl • mancozeb (jinlei), metalaxyl • mancozeb and gold, azime Ester (Amishida) and Esterella (Tribe), Pyraclostrobin (Kai Run), Pyraclostrobin, Daisenlian (Bai Tai), Fluopyramine • Creamy Mildew (Silver) Fali) and downy mildew (Pullik), difenoconazole and myclobutanil, tetrafluoroetherazole, acetem, enoylmorpholine, mancozeb (ankmann) and enoyl Porphyrin, flumorpholine (cunk), iprodione (puffin) and vinyl nucleus, procymidone (Sylphyrin), 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.

(2) It is recommended that several barrel mixes of cucumber downy mildew, powdery mildew and gray mold occur when heavier: 68.75% fluopyram • chlorfenapyr (silfane) suspension + 10% difenoconazole (Shigao) water-dispersible granules + 50% fludioxonil (Huiyou) wettable powder or 50% nicotinamide (pyridinamide) (Kaiser) water-dispersible granules;

When tomato late blight, gray mold, leaf mold, and early blight occur more seriously: 68% refined metalaxyl • mancozeb (golden) water dispersible granules + 32.5% azoxystrobin • difenoconazole (Ami Miaoyue) Suspending Agent or Shigao + Huiyou or Niacinamide (Kaiser);

When tomato gray mold, cucumber gray mold, strawberry gray mold, and pepper gray mold occur heavier: 50% nicotinamide (pyridinamide) (Kaiser) water-dispersible granules + 25% pyraclostrobin (Kai Run) emulsifiable concentrate;

Prevention and control of powdery mildew, gray mold, downy mildew, late blight: 56% azoxystrobin and chlorothalonil (Ami colorful) suspension, 32.5% azoxystrobin and difenoconazole (Ami Miao) suspension Agent, azoxystrobin + difenoconazole + chlorothalonil, difenoconazole + chlorothalonil;

Prevention and treatment of melon crop anthracnose: carbendazim + sulfur;

Anti-virus and increase crop disease resistance: anti-viral agents + nutrition package Jiamei Jin points.

(3) 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, 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) The water-dispersible granules are mixed with 1500 times. 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. For example, 80% mancozeb (Dasheng) wettable powder mixed with 25% azoxystrobin (Amisida) suspension, the dilution concentration of the two drugs can be 500 times and 2000 times respectively (Amisida The recommended concentration is 1500 times).

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