preemergence

The seed tubers are usually planted in ridges at a depth of 5-15 cm and kept free from weeds; preemergence herbicides can be used for this purpose.

Chapter 25 1987

In the USA the use of preemergence herbicides has been tried with success: 2,4-D amine at 1.9 kg/ha gave good weed control and was effective for 3 months.

Chapter 13 1987

Valent herbicides covered under the agreement include the growing line of preemergence residual herbicides such as Valor® SX, Valor XLT, Gangster® and Fierce™, a new product pending registration, along with the Select® branded post-grass herbicides in the United States.

Monsanto, Sumitomo Chemical and Valent Announce Long-Term Crop Protection Collaboration - Yahoo! Finance 2010

The crabgrass preventers, or preemergence herbicides, applied in spring have no effect on established tall fescue.

unknown title 2009

For chemical control, use a preemergence product or spot-treat plantains in the garden with glyphosate, taking care not to get the chemical on desirable plants.

Lead Stories from AOL 2009

New preemergence (PRE) and postemergence (POST) herbicides make it possible to put together herbicide programs for non-GMO corn that provide weed control and yield similar to those in glyphosate-resistant or Liberty Link corn, at a roughly equivalent cost.

unknown title 2009

The crabgrass preventers, or preemergence herbicides, applied in spring have no effect on established tall fescue.

unknown title 2009

Remember none of the preemergence crabgrass herbicides work on these established perennials.

unknown title 2009

Remember none of the preemergence crabgrass herbicides work on these established perennials.

unknown title 2009

If chemical control is necessary in lawns, use a preemergence product in late winter before seeds germinate, following label directions.

Lead Stories from AOL 2009