Quantcast Chemical, Physical, and Biological Properties of Herbicides and Plant Growth Regulators -Cont. - mo3140085

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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
Dermal
Trade Name and
L D50 (mg/kg)
Manufacturer2
Commercial Formulation
Biological Information and Remarks
and Rating
Toxicity
DCPA (Chlorthal)
DACTHAL
Preemergence, soil-applied herbicide for control of
> 3,000
slightly
dimethyl tetrachloro =
moderately
weed grasses and certain broadleaf weeds in turf,
Fermenta
toxic
terephthalate
toxic
ornamentals, and certain other crops. Highly selec-
($6.35/lb; granular,
tive and safe on many annual and perennial orna-
mentals. It is not absorbed by foliage nor transloca-
wettable powder)
ted in the plant. It kills germinating seeds, but exact
mechanism of action is not known. It does not
volatize nor leach in soil. It is broken down microbi-
ally in the soil; average half-life is 100 days.
Dicamba
Dicamba is used either as soil treatment or as a
BANVEL
2,900
moderate,
3,6-dichloro- o -anisic
foliage spray for selective control of broadleaf
BANVEL II
highly
moderately
weeds. It is more effective on some weeds than
acid
irritating
Velsicol
toxic
($13.75/lb; granular,
2,4-D, less so on others. It is used selectively in grass
to eye
water-soluble liquid)
crops, turf, grazing lands, and noncropland. Broad-
leaf crops and ornamental and garden plants are
quite sensitive. Injury can occur from small amounts
of dicamba residue in soil, or from a small amount
of drift or vapor. It is absorbed by leaves and roots
and is translocated. The killing action is similar to
2,4-D. It inhibits development of buds, causes stem
swelling, and eventually kills all plant tissues. Di-
camba is water soluble and mobile in soil, and
persists longer than 2,4-D. Persistence is longest
under cool and dry, or very moist, conditions. It is
broken down by soil microorganisms.
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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