Vegetable growers should keep the following in mind before applying any unlabelled tank mixes:
- For two products that control the same pest, rotating products is often sufficient for resistance management, unless otherwise specified on the label. Instead of paying for multiple inexpensive products in a tank mix, consider a single application of a more expensive but more targeted alternative.
- Always use the application rates specified on the product labels. The label rates are designed to provide the maximum amount of control with the minimum amount of product. Applying a higher rate is a waste of money, could damage the crop, and contributes to the development of resistance. Applying a lower rate will not adequately control the pest.
- A tank mix will not extend the period of protection of either of the tank-mix partners. Re-application will still be necessary on the same schedule.
- Some products are already a combination of two products. Thus, they already provide the benefits of a tank mix and there is no need for further mixing.
- Keep in mind that products applied for different pests often have different requirments. For example, combining products that require different water volumes could compromise control of one or more of the targeted pests, or increase the risk of crop damage.
- When the crop has been subjected to other stresses (eg. saturated soils, holding of transplants), use extra caution when applying any unlabelled tank mixes.
- Not all products registered for use on a crop are compatible. Read the labels carefully and consult the company before combining any products in a tank mix. As mentioned in the article above, anyone who recommends or applies an unlabelled tank mix is responsible for what happens and is liable if anything goes wrong.