CHEMICAL, PHYSICAL, AND BIOLOGICAL PROPERTIES OF HERBICIDES AND PLANT GROWTH REGULATORS -- Continued
(Cost per Pound; and
Trade Name and
L D50 (mg/kg)
Biological Information and Remarks
2,4-D is a foliage applied, systemic herbicide that
selectively controls most broadleaf weeds in cereal
crops and other grasses. It also controls broadleaf
aquatic plants. Most dicot crops are injured or
killed. The salt and low volatile ester formulations
are of sufficiently low volatility that, with care, they
may be used near fairly susceptible crops, if spray
drift is prevented. Salt formulations do not signifi-
cantly volatilize even on the warmest days. Soil ap-
plications are of marginal effectiveness. After foliar
absorption, 2,4-D translocates within the phloem
along with photosynthates. It causes abnormal growth
responses and increases respiration, reduces food
reserves, and affects cell division, but the primary
mode of action has not been clearly established.
2,4-D undergoes microbial breakdown in warm,
moist soil. It generally persists in soil 1 to 4 weeks.
A preplant soil fumigant that kills most weed seeds,
nematodes, soil fungi, and certain soil insects. Soil
2 H -1,3,5-thiadiazine-2-
should be cultivated and moist. Product is incorpo-
rated in the soil, using conventional equipment, 3
weeks before planting in summer and fall, and 4
wet table powder,
weeks in spring. If soil is dry, irrigate the treated
field with 1/2 inch of water. Dust may cause
irritation to skin and eyes. Use safety gloves, gog-
gles, dust respirator, and label. It should not be used
closer than within 3-4 feet of desired plants or within
dripline of trees and shrubs.
A chemical name occupying two lines separated by an equal (=) sign would be joined together without any separation if written on one line.
Mention of trade name or company is for information only, and does not constitute an endorsement over other products not mentioned.