Technical key points for tank-mixing fungicides with insecticides, regulators, foliar fertilizers, etc.

Throughout the entire process of growing crops, many growers use a large number of mixed agents, such as tank-mixing fungicides with fungicides or other types of fertilizers for immediate use, which can both slow the development of resistance and boost efficacy, while also reducing the cost of application. Therefore, below the editor will briefly discuss the techniques for tank-mixing fungicides with insecticides, regulators, foliar fertilizers, etc., in the hope that it will be of some help to everyone.

I. Several situations in which mixed agents or tank mixes must be used

1. Combinations of fungicides with fungicides and insecticides

For example, tank-mixing a pesticide for controlling whiteflies or aphids (acetamiprid) with a pesticide for controlling downy mildew (metalaxyl-M · mancozeb) or a pesticide for controlling gray mold (iprodione, nicotinamide, fludioxonil), etc.

2. Combinations of fungicides with the microbial agent naphthaleneacetic acid

For example, farmers widely mix the growth hormone 2,4-D with fungicides for controlling gray mold (fludioxonil, pyrimethanil, etc.) and then smear it on tomato flower buds (also called flower dipping).

3. Combinations of fungicides with foliar fertilizers

4. Combinations of fungicides with tank-mix adjuvants

II. The difference between mixed formulations and tank mixing

1. Mixed formulations and tank mixing are not the same.

2. Tank mixing is when the pesticide user mixes and applies pesticides as needed.

3. A mixed agent is a technically formulated preparation processed in advance, and farmers can no longer change its composition when using it.

III. Common issues with tank-mixing fungicides

1. Whether there is antagonism after the pesticides are mixed.

2. After preparing a solution of one fungicide and then adding another fungicide or other pesticide or fertilizer, if flocculent precipitate appears or discoloration, layering, bubbling, etc. occurs, this indicates that the fungicide cannot be tank-mixed with that pesticide or fertilizer.

IV. Several situations in which pesticides cannot be tank-mixed

1. Oxadixyl · mancozeb and metalaxyl-M · mancozeb;

2. Metalaxyl · mancozeb and Jinglei, azoxystrobin and kresoxim-methyl;

3. Pyraclostrobin and pyraclostrobin · metiram;

4. Fluopicolide · propamocarb and propamocarb;

5. Difenoconazole and myclobutanil;

6. Dimethomorph · mancozeb and dimethomorph;

7. Iprodione and dimethachlon;

8. Triadimefon and thiophanate-methyl;

9. Mixed agents containing mancozeb cannot be tank-mixed with mancozeb again;

10. Copper preparations generally cannot be tank-mixed with alkaline fertilizers.

V. Several recommended tank-mix combinations

1. When cucumber downy mildew, downy mildew, and gray mold damage are severe

68.75% fluopicolide · propamocarb suspension concentrate + 10% difenoconazole water-dispersible granules + 50% fludioxonil wettable powder or 50% nicotinamide water-dispersible granules.

2. When tomato late blight, gray mold, leaf mold, and early blight damage are severe

68% metalaxyl-M · mancozeb water-dispersible granules + 32.5% azoxystrobin · difenoconazole suspension concentrate or Score + Huifriend or nicotinamide.

3. When tomato gray mold, cucumber gray mold, strawberry gray mold, and chili pepper gray mold damage are severe

50% nicotinamide water-dispersible granules + 25% pyraclostrobin emulsifiable concentrate.

4. For controlling downy mildew, gray mold, downy mildew, and late blight

56% azoxystrobin · chlorothalonil suspension concentrate, 32.5% azoxystrobin · difenoconazole suspension concentrate, azoxystrobin + difenoconazole + chlorothalonil, difenoconazole + chlorothalonil.

5. For controlling anthracnose in cucurbit vegetable crops

Triadimefon + sulfur powder.

6. Antiviral treatment and improving crop disease resistance

Antiviral drugs + leaf nutrients.

VI. Determining the concentration to use in the tank mix

Based on the effective dilution concentration for the disease, for example, for controlling downy mildew and gray mold, 68.75% fluopicolide · propamocarb suspension concentrate at a concentration of 600-fold solution + 25% nicotinamide water-dispersible granules at 1500-fold solution, tank-mixed for immediate use, to control the disease.