Non selective herbicide falls under the category of post emergent weed control. These kill anything the chemical comes in contact with.
Refer to herbicides outline to better understand how this page fits into it.
The Action process for post emergent weed control falls under
a) Selective (See Outline for both Systemic and Selective)
Contact herbicides do not differentiate between the different
types of vegetation. This includes dicots, monocots and Sedges.
These herbicides will kill everything they come into contact
with regardless of plant, plant stage or size.
These chemicals are most effective on annual weeds.
Unlike selective herbicides, these don't kill the entire root system.
If contact herbicides are over-used they can also promote
and cause soil erosion, tree-rot, possible exposure of the tree roots or injury to tree roots with cold temperatures.
As with selective, these chemicals have similar drawbacks. Once the soil welcomes new growth weed populations can come back and be more difficult to control.
It is recommended to rotate methods of weed extermination. While certain types of weeds are killed by each, a selective and non selective herbicide, rotating methods of weed control helps to clear up other types of weeds.
A alternative to more toxic chemicals, and are also good on perennial weeds, are herbicidal soaps. These are considered a broad-spectrum, non-selective herbicide for spot treatments. These soaps destroy plant cell walls upon contact, drying the plant out and eventually killing it.
An herbicidal soap works especially well on seedlings and mosses. Weeds with deep tap-roots or perennial weeds will need multiple applications. Soap will break down within a few days after use.
Selective Weed Control - Dicots, Monocots and Sedges
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