Which statement reflects best practice when mixing pesticides?

• A. Test all pesticide mixtures on a small number of plants before using widely on the site
• B. Always mix pesticides at double the rate
• C. Mix pesticides with irrigation water without testing
• D. Use the same mixture for all pests regardless of site

Answer: (A)

Testing a pesticide mixture on a small group of plants before applying it site-wide is best practice because it helps you spot potential phytotoxicity, crop sensitivity, or tank-mix incompatibilities before you commit to a large-scale use. This early check protects the crop, ensures the mixture works as intended, and keeps you aligned with label directions and safety considerations. Doubling the rate is unsafe and not permitted by most labels. Mixing pesticides with irrigation water without testing can lead to unpredictable results and crop damage. Using the same mixture for all pests regardless of site ignores differences in crop type, growth stage, and pest biology, which can result in ineffective control and potential harm to the crop.