Even the most vigilant gardener will have a weed or two in their lawn. Herbicides are useful in the battle against annual, perennial, and biennial weeds, but you have to know when to use them and which ones are most effective against a particular weed problem.
Perennial weeds develop thick persistent adult roots that re-sprout in spring, which makes them difficult to control with a pre-emergent formula. Annual weeds are in two classes: winter and summer annuals. The timing of a pre-emergence weed killer for each must match the germination period for the variety of weed. Biennial weeds, like dandelions, are not controlled by a pre-emergent because they produce seed that germinates nearly year around.
What are Pre-Emergent Herbicides?
Pre-emergence weed killers are used before you see the weeds to prevent them from showing up in the garden or lawn. This doesn’t mean the chemicals interfere with germination but rather they stop the formation of new root cells in baby weed plants.
Established plants have nothing to fear, as their root system is already developed and the plant is hearty and healthy. Pre-emergent info indicates that it is the sensitive root tissue of newly germinated seedlings that is killed off, resulting in complete plant death.
The chemicals in pre-emergent weed killers are not effective on vegetative buds that sprout from existing roots or rhizomes. They also cannot be used on a prepared grass seedbed because their root stunting action in young plants will also affect sprouting grass.
Leave nothing behind. That’s a bold statement. Yet when it comes to pre-seed weed control in cereals, we’ve got the products to back it up.
Corteva Agriscience™ offers four cereal pre-seed herbicides with SoilActive™ technology, created for extended broadleaf weed control. SoilActive™ technology controls the weeds you see on the surface, as well as the weeds you can’t see, for up to two weeks after application. That’s because SoilActive™ technology binds with the herbicide’s active ingredient and forms a protective barrier on the soil surface to extend weed control. Weeds on the soil surface are controlled, and any susceptible weeds that try to germinate and emerge encounter the still-live active ingredient, stopping them before they can establish. That means you can give your cereal crops the best start possible.