What is the difference between contact and systemic pesticides?

The distinction between contact and systemic pesticides is fundamental to understanding their modes of action and effective application in pest management.

The correct answer clarifies that contact pesticides are designed to kill pests immediately upon direct contact. This means that the effectiveness of these pesticides relies on their physical application to the pest itself. They do not move through the plant's tissues.

On the other hand, systemic pesticides are absorbed by plants, becoming part of the plant's physiology. When pests feed on the treated plant, they ingest the pesticide, which results in their control. This systemic action allows the pesticide to protect not only the treated parts but also new growth, making it especially useful for long-term pest control.

This understanding is crucial for selecting the appropriate pest control measure based on the type of pest infestation and the specific plants involved, as different pests and plant types may require different strategies.