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To prevent growth of crabgrass, preemergent herbicides must be applied at a critical time. If they are applied to the soil too early, they get washed too deep into the soil or washed away by rainwater. If they are applied too late, the key enzyme inhibited is no longer active. The best control requires a second application about 6–8 weeks later.
If you use a pre-emergent herbicide, you’ll need to wait to plant grass seed until 60 days after application. To lay down sod, wait 75 days. John D. Byrd, Mississippi State University, Bugwood.org
So, three treatments are needed: two for the warm-season weeds crabgrass and grassburs, and one for the cool-season weeds annual bluegrass and rescuegrass (among many others).
Pre-emergent formulas are applied in late winter or early spring before the weeds emerge. Liquid products perform well when the weeds are still actively growing in early fall so there is optimum ...
Pendimethalin is a K1-group (in Australia group D, or numerically group 3) according to the Herbicide Resistance Action Committee (HRAC) classification and is approved in Europe, North America, South America, Africa, Asia and Oceania for different crops including cereals (wheat, barley, rye, triticale), corn, soybeans, rice, potato, legumes ...
For example, weeds reproducing from last year's seed can be prevented with mulches and pre-emergent herbicide. [citation needed] Pest-tolerant crops such as soybeans may not warrant interventions unless the pests are numerous or rapidly increasing. Intervention is warranted if the expected cost of damage by the pest is more than the cost of ...
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