What is the key distinction between contact and systemic pesticides?

Prepare for the Tennessee Category 3 Pesticide Certification Test. Study using flashcards and multiple choice questions with hints and explanations. Excel at your exam!

The key distinction between contact and systemic pesticides lies in their mode of action. Contact pesticides are designed to kill pests upon direct contact. This means that they need to be sprayed directly onto the pests or onto surfaces where pests are likely to crawl or feed. They do not penetrate or move within the plant; rather, their effectiveness is immediate but often limited to the areas where they are applied.

In contrast, systemic pesticides are absorbed by plants and translocated throughout their tissues. This allows them to provide protection against pests that may feed on or come into contact with any part of the plant, including new growth. Systemic pesticides can be particularly effective against pests that are difficult to target directly with contact applications, such as those that burrow into plant tissues or reside on the inside of stems and leaves.

The other options provided do not accurately convey the primary difference in how these two types of pesticides function. For example, price comparison, usage indoors, or safety claims do not pertain to the fundamental operational mechanics of contact versus systemic pesticides. Understanding this distinction is crucial for effective pest management strategies in agriculture and horticulture.

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