2335Re: [AZ] question:lichens
- Apr 1, 2005"JOT" <JimPatsy@...> wrote:
>lats spring i purchsed a product to use in my vegetable garden andWhy would anyone want to control lichens (Lichenes)? They are
>in reading the label i found it could be use to control lichens.
>the product "kop-r- spray" by "lilly miller".it contains 8% metallic copper.
>'i tried it and am pleased with the results.( requires several treatments.)
>i don't have a photo of before but the first attmt is a couple of
>limbs of the plant i treated.the sec photo is of the plant i plan to
>treat this spring and will follow up with an after photo this fall.
harmless. They derive their nourishment from the air, and generate
by means of spores. A favorite theory of lichens (called after its
inventor the Schwendener hypothesis), is that they are not autonomous
plants, but that they consist of ascigerous fungi which grow
symbiotically with algae. New Zealanders love wooden garden
furniture that looks bleached and is covered with lichens. Lichens
are almost as attractive as Spanish moss and just as harmless.
Epiphytes are not parasites. They are pioneer plants that help
recover severely damaged areas.
Jerral Johnson of the Texas extension service published the following:
"The effect of lichens on a tree are only slightly detrimental. The
plants are epiphytes. That is they derive their nutrients from the
air and not from the plant on which they are growing. Although they
are not parasitized, literature reports suggest that lichens do have
a slight negative effect. The main concern is that lichens give a
tree an unkept appearance. Presence of lichens also is a good
indicator of a thin tree canopy. This often leads homeowners to
conclude that lichens are the cause and not the effect of thin
foliage. The best control for lichens is maintain the tree in good
condition. This will insure a dense canopy which will shade the limbs
and reduce photosynthesis. Without photosynthesis, lichens are not
able to manufacture food needed for growth and development.
Copper containing fungicides are suggested as possible controls for
lichens. Applications of Kocide DF for the control of ball moss, have
been observed to control lichens for a short period of time.
Currently copper fungicides are not approved for lichen control.
Because of their limited affect on a plant, chemical control is not
Cheers, Steve Henning in Reading, PA USA Zone 6
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