Comprehensive Resources for Agriculture: Topical Questions, Past Papers, and Answers
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Contact vs. Systemic Herbicides: Understanding Different Modes of Weed Control
​Distinguishing Between Contact and Systemic Herbicides in Weed Control
​ In weed control, herbicides are classified into two main categories: contact herbicides and systemic herbicides. These two types of herbicides differ in their mode of action and how they affect the target weeds. Let's explore the differences between contact and systemic herbicides: Contact Herbicides: Contact herbicides, as the name suggests, primarily act on the parts of the weed that they come into direct contact with. When applied to the foliage or exposed surfaces of the weed, contact herbicides kill the plant tissue they touch. They do not move or translocate within the plant. Contact herbicides are effective in controlling annual weeds and small-seeded weeds because they target the above-ground portions of the plant. Key characteristics of contact herbicides include:
Systemic Herbicides: Systemic herbicides, on the other hand, are taken up by the plant and translocated throughout its tissues. They can enter the plant through the foliage or roots and move within the vascular system, reaching all parts of the plant, including the roots, stems, and leaves. Systemic herbicides provide more thorough control as they affect the entire plant, including underground parts. Key characteristics of systemic herbicides include:
Understanding the differences between contact and systemic herbicides is crucial for choosing the appropriate herbicide for specific weed control needs. Contact herbicides are effective for controlling small-seeded annual weeds and providing quick suppression, while systemic herbicides offer broader control of both annual and perennial weeds, targeting the entire plant, including underground parts.
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