Oregon Pesticide Practice Test

What does it indicate when two or more pesticides mixed together form a putty or paste?

1. They are chemically complementary.

2. They show physical incompatibility.

3. They are safe for use on all crops.

4. They indicate the need for additional adjuvants.

The correct answer is: They show physical incompatibility.

When two or more pesticides mixed together form a putty or paste, it indicates physical incompatibility. This phenomenon occurs when the physical characteristics of the products prevent them from mixing properly, leading to a thick or gel-like consistency. Such a reaction suggests that the pesticides do not combine uniformly, which can affect the way they perform in application. This incompatibility can lead to reduced efficacy, as the active ingredients may not be available in the right proportions or formulations necessary for effective pest control. Understanding physical incompatibility is crucial for pesticide applicators, as using incompatible mixtures can result in poor treatment outcomes and might necessitate adjusting the mixture or selecting compatible products for effective pest management.