Which of the following adjuvants is used to improve mixing and stabilize pH levels?

An acidifier is an adjuvant specifically designed to adjust the pH of a solution, which can significantly enhance the stability and effectiveness of pesticide formulations. By lowering the pH, acidifiers can improve the solubility of certain active ingredients, ensuring better mixing and more consistent application. This is particularly important because the pH of a spray solution can affect the efficacy of pesticides, potentially altering their performance in the field.

In contrast, other adjuvants serve different functions. A sticker is used to help the pesticide adhere to the target surface, increasing retention and effectiveness. A defoamer is employed to reduce the formation of foam in spray solutions, enhancing the smooth application of products. An attractant is utilized to draw pests to a specific area or bait but does not play a role in modifying the pH or improving mixing. Each of these adjuvants has a unique purpose, making the acidifier particularly suited for stabilizing pH levels in a mixture.