Which adjuvant helps to protect against wash-off after application?

The adjuvant that helps protect against wash-off after application is a sticker. Stickers are designed to enhance the adhesion of the pesticide to the target surface, such as plant foliage or surfaces requiring treatment. By increasing the sticking capability, stickers help ensure that the pesticide remains in place even when rain or irrigation occurs shortly after application. This means that a sticker can effectively reduce the likelihood of the active ingredients being washed away, thus improving the efficacy of the treatment.

Other adjuvants serve different purposes; for instance, buffers are used to adjust the pH of the spray solution to optimize the performance of the pesticide, colorants help with visibility when applying chemicals, and defoamers work to reduce foam in the application mix. However, none of these options provide the same protective function against wash-off as a sticker does. Therefore, the role of a sticker is critical for ensuring that the chemical remains effective on the target surfaces after it has been applied.