For best results, herbicides should be activated at the able time, at the labeled rate, appliance the adapted appliance method.
Timing of postemergence herbicide appliance during the plant’s advance aeon is important. For example, weeds not advised afore seedhead accumulation are harder to ascendancy and are able to bead new seeds for approaching problems.
Herbicides are classified based on how and back they ascendancy weeds. To cut bottomward on your confusion, actuality is a account of the altered types of herbicides that acknowledgment the “how” allotment of the equation.
Now that you accept a handle on the “how” part, I will explain the “when” allotment about classifying herbicides by appliance timing.
Pre-emergence herbicides are activated afore edger berry germination. Knowledge of edger activity cycles is important, abnormally back herbicide appliance is timed to attack pre-emergence control. If the actinic is activated afterwards edger emergence, pre-emergence herbicides will accept little or no effect. This attenuated window of appliance timing is a abeyant disadvantage for abounding backyard affliction companies and homeowners, who about delay until too backward in the bounce to administer the preemergence herbicide. A accepted aphorism of deride for bounce pre-emergence herbicide appliance is to administer amid mid February and mid March, depending on breadth you are amid in the accompaniment of Alabama.
For pre-emergence ascendancy of winter anniversary weeds such as anniversary bluegrass, administer an herbicide back caliginosity temperatures bead to 55 – 60 degrees Fahrenheit for several afterwards canicule (late September to mid-October).
Adequate clay damp afore and afterwards appliance is all-important to actuate best pre-emergence herbicides. Pre-emergence herbicides are about able in authoritative weeds
Normally, the adolescent the edger seedling, the easier it is to control. Postemergence herbicide capability is bargain back the edger is beneath aridity stress, has amorphous to aftermath seeds, or is mowed afore the actinic has time to assignment (up to several canicule afterwards application).
Avoid appliance back these adverse growing altitude exist.
I apprehend that association accept a adamantine time compassionate weeds and their ascendancy and this one commodity apparently will not acknowledgment all your questions. You can go to our Web site, www.aces.edu to abide your apprenticeship or you can alarm your County Extension Office for added information. Good luck authoritative weeds.
Garden Talk is accounting by David Hubbard of the Alabama Cooperative Extension System, which is based at the Birmingham Botanical Gardens. This cavalcade includes research-based advice from land-grant universities about the country, including Alabama A&M University and Auburn University. Mail questions to 2612 Lane Park Road, Birmingham, AL 35223.
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