napropamide

Napropamide is a pre-emergent, soil-applied herbicide in the amide family that is used to control a broad spectrum of annual grasses and some broadleaf weeds in various crops. It is registered for use in vegetables and other crops and is marketed under trade names such as Devrinol. The product is applied to the soil before weed seeds germinate and is typically incorporated into the top layer of soil or relies on rainfall to move into the root zone where germinating weed seedlings absorb it.

The herbicide acts primarily in the soil to inhibit early weed growth, reducing competition from germinating weeds. Its effectiveness depends on factors such as soil type, moisture, temperature, and timing relative to crop planting and weed emergence. Napropamide is often used in combination with other herbicides as part of an integrated weed management program, and labels provide crop-specific rates and use instructions.

Formulations commonly include granular and liquid products. Application and incorporation guidelines vary by crop and region, with recommendations concerning preplant or preemergence use, appropriate soil moisture, and intervals before planting or harvest. Adherence to label directions is essential for efficacy and safety.

Environmental fate and safety: Napropamide is relatively persistent in soil and can have extended residence times under certain conditions. It tends to remain in the topsoil with variable mobility depending on soil characteristics. Degradation occurs through microbial action and surface photolysis. Potential risks to aquatic organisms and non-target species exist if the product is misapplied, so precautions to prevent runoff and drift are recommended.

Regulatory status: In some jurisdictions, napropamide is designated as a restricted-use pesticide requiring trained applicators. Users should consult the product label and local regulations for crop-specific restrictions, safety measures, and disposal instructions.