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 CHEMICAL, PHYSICAL, AND BIOLOGICAL PROPERTIES OF HERBICIDES AND PLANT GROWTH REGULATORS-Continued
Common and
Acute Oral
Chemical Designations1
Toxicity,
(Cost per Pound; and
Trade Name and
Dermal
L D50 (mg/kg)
Manufacturer2
Commercial Formulation
and Rating
Toxicity
Biological Information and Remarks
Tebuthiuron
GRASLAN
644
moderately
A soil treatment, either sprayed or applied dry on the
N -[5-(1,1-dimethyl=
SPIKE
moderately
toxic
soil surface, preferably just before or during a period
ethyl)-1,3,4-thiadiazol-
Elanco
toxic
of active growth of weeds and brush. Initial control
2-yl]- N,N' -dimethylurea
is enhanced by rainfall. It controls many herbaceous
($18.50/lb; pellets,
and woody plants. Low rates may be used to
granules, wettable
selectively control some weed and brush species, and
powder)
can leave some grass species for cover or for grazing.
At higher rates it is a soil sterilant. It is readily
absorbed by roots, less so through foliage. It inhibits
photosynthesis. It has a half-life in soil of 12-15
months in ares receiving 40-60 inches annual rainfall.
It is considerably greater in areas with low rainfall.
In field studies, tebuthiuron has seldom been de-
tected below the top 12 inches of soil. Microbial
breakdown has been shown to occur, but the pre-
dominant mode of degradation probably does not
involve soil microbes. Loss from soil by photode-
composition and volatilization is negligible. It can be
carried to adjoining areas by runoff water.
1
A chemical name occupying two lines separated by an equal (=) sign would be joined together without any separation if written on one line.
2
Mention of trade name or company is for information only, and does not constitute an endorsement over other products not mentioned.
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