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2,4-D Amine, 2,4-D Ester, Salvo 2,4-D: 2,4-D

Author: OMAFRA Staff
Creation Date: 25 November 2002
Last Reviewed: 21 January 2008
Pub 75: Guide to Weed Control > Notes on Herbicides > 2,4-D Amine, 2,4-D Ester: 2,4-D
Excerpt from Chapter 4, Publication 75, Guide to Weed Control, Order this publication
Trade Names Formulation Guaranteed active concentration Ontario Schedule Winter Storage Manufacturer/ Registrant 
2,4-D Amine 500 EC 470 g/L 3 A Nufarm Agriculture Inc
2,4-D Amine 500 EC 470 g/L 3 A United Agri Products
2, 4-D Amine 600
 EC  564 g/L 2 A Various manufacturers
2, 4-D Ester 600 EC  564 g/L 2 C

Interprovincial Cooperative .
2, 4-D Ester 600 EC  564 g/L 2 C United Agri Products
2, 4-D Ester 700 EC  660 g/L 2 C Various manufacturers
Salvo 2,4-D Ester 700 Sn 660 g/L 2 C United Agri Products

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Chemical Family Phenoxy
Group 4
Crop and/or Non-Crop Registrations Cereals, turf, pastures, non-crop land, asparagus, field corn, cranberries, raspberries, strawberries, bearing fruit trees including apple, pear, peach, plum, apricot and cherries, water weeds and brush.
Sensitive Weeds Most broadleaf weeds, and brush.
Uptake and Translocation Readily absorbed through leaves or roots. Translocated primarily in phloem with the sugars but can also move with water in the xylem. Accumulation is primarily in the young, rapidly growing meristematic regions of roots or shoots.
Basis of Selectivity Differences in interception, penetration, translocation, metabolism and sensitivity of active sites lead to greater activity on broadleaf weeds compared to grasses.
Application Methods Postemergence (broadleaf weeds), stem-foliage or stem-basal (brush).
Residual Activity Half-life in soil is usually not longer than 1 or 2 weeks during the growing season due to rapid decomposition by soil micro-organisms.
Unique Characteristics All weeds are more easily killed when growing rapidly in moist soil. Unfortunately,some broadleaf crops, garden and ornamental plants are as sensitive to 2,4-D as many weeds and only a trace of the chemical as spray drift, vapour drift or contaminant in soil or water may cause serious damage. Even crops that can be sprayed safely can be sensitive at some stages of growth or at excessive application rates; thus label precautions should be followed carefully. Amines and esters are the most common formulations of 2,4-D. The esters are the most active and can be used at the lower rates and for brush control. Since vapour drift is a potential problem with the ester formulations, only the amines should be used on lawns, or near gardens or susceptible crop areas. Low-volatile esters can be used by agriculturists or licenced applicators in areas where risk of damage to sensitive non-target vegetation is low. Recommendations are on the basis of acid equivalent; commercial products differ in their content of acid equivalent, which must be considered in determining the amount of product to use.

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