What is a major disadvantage of phenoxy herbicides?

Study for the Iowa Right-of-Way Herbicide Category 6 Exam. Discover flashcards and multiple choice questions, each accompanied by helpful hints and explanations. Prepare effectively for your certification!

Phenoxy herbicides, such as 2,4-D, are known for their ability to selectively control broadleaf weeds while leaving grasses largely unharmed. However, a major disadvantage of these herbicides is their propensity to damage desirable plants at very low rates. This is particularly concerning in situations where non-target plants are in proximity to treated areas, as even minimal exposure through drift or root uptake can lead to injury or death of these plants. This characteristic underscores the need for careful application practices to avoid unintended damage when using phenoxy herbicides.

The other options relate to other herbicide properties but do not specifically reflect the primary concern associated with phenoxy herbicides. For instance, while phenoxy herbicides can have toxicity to certain wildlife, they are not broadly classified as highly toxic in the context of ecological impact compared to other chemical classes. They also have some selectivity and are not non-selective like glyphosate. Additionally, the persistence of these herbicides in the soil can vary significantly, and while some residual activity may occur, many phenoxy herbicides do not persist as long as others designed for long-term soil protection.

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