|
 Forest
herbicides such as hexazinone have been used with success to suppress the
growth of midstory oaks while promoting the growth of longleaf pine seedlings
and wiregrass (Aristida stricta), the understory grass species associated
with longleaf pine.
Chemical Effects of Hexazinone
Hexazinone is a selective herbicide registered for use in pine management
for site preparation, release, and herbaceous weed control. It is
absorbed from the soil solution by plant roots. Inside the plant
it binds to a specific protein and inhibits important reactions necessary
for the plant to survive.
| This herbicide
is more effective on soils with high sand content, low pH (acidic),
and low organic matter content. These conditions are typical
of soils in the southeastern U.S. Southern pines and grasses
are more resistant to hexazinone, while oaks are more susceptible,
making it a good candidate for assisting in the restoration of sandhill
plant communities. |
Hexazinone is soluble in water and has been found to persist
in the soil for relatively short periods of time. It is not registered
for aquatic use so it must not be applied in close proximity to such areas.
As always, read all herbicide labels before use.
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One
method many forest managers are using to restore longleaf pine ecosystems
is reintroduction of fire to sandhills. However, fire is a successful
restoration tool only when there is a sufficient ground cover of grass and
pine needles, which act as a major fuel source.
