Princep Liquid herbicide

Find the latest news, product updates, regulatory developments, research, label changes, and weed-management information related to Princep® Liquid Herbicide. Stay informed on simazine, pre-emergence weed control, broadleaf weeds, annual grasses, herbicide resistance, crop protection, and pesticide stewardship.

Princep® Liquid Herbicide is a Syngenta herbicide containing simazine as its active ingredient. The product is a Group 5 herbicide and is designed to control a broad range of annual broadleaf and grass weeds, primarily through root uptake. The current Syngenta product information identifies simazine as the active ingredient and lists applications in crops including corn, fruits and nuts, subject to the approved label and state-specific requirements.

Princep Liquid is generally applied before weeds emerge or after existing weed growth has been removed, with soil moisture helping move the herbicide into the root zone. The product label highlights weeds including crabgrass, foxtails, barnyardgrass, annual ryegrass, pigweed, lambsquarters, ragweed, nightshade, wild mustard, and wild oats, among others.

Because simazine belongs to WSSA Group 5, resistance management is an important consideration. The label recommends scouting fields, using diversified weed-management practices, avoiding repeated reliance on the same mode of action, and integrating cultural or mechanical control where appropriate. Use restrictions and approved applications can vary by crop, state, locality, and product label, so the applicable current label should always be consulted before use.

This category features Princep Liquid news, product and label updates, simazine research, weed-control developments, herbicide resistance, regulatory decisions, crop protection, stewardship initiatives, and developments related to Group 5 herbicides.