Chemical control
There are two problems with attempting chemical control of field
horsetail. One is that herbicidal management of horsetail may
damage the floristic value of the rough. The other is the structure of
the plant in terms of its siliceous epidermis. This means that it is very
difficult to enable adequate uptake of the chemical to reach the plant
and at high enough levels to have a useful effect. It is often
suggested that scarring the plant surface by means of slashing,
cutting the tops, etc. or bruising the stems can allow uptake to a
level high enough to allow sufficient chemicals to penetrate to the
roots. At present, results are inconsistent but the chemicals most
widely recommended are glyphosate, MCPA, dichlobenil and
amitrole. Systemic herbicides such as glyphosate, clopyralid, MCPA
and 2,4-0 are able to reach the rhizome root system when they have
entered the plant but multiple applications are required and reqrowth
will occur. As selective herbicide MCPA and 2,4D are safe in
grassed areas and may reduce field horsetail if applied regularly.
MCPA, together with c1opyralid, is also reportedly effective in
reducing the population density.
Any chemical will require multiple applications and full control is
unlikely. However, glufosinate ammonium, amitrole and glyphosate
may have potential in weed wipes and MCPA, clopyralid and 2,4-0
may give selective control.
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