The relative toxicities to plants of amine-salt and ester formulations of 2 : 4-dichlorophenoxyacetic acid

✍ Scribed by K. Carpenter; R. D. Walker

• Publisher: John Wiley and Sons
• Year: 1952
• Tongue: English
• Weight: 530 KB
• Volume: 3
• Category: Article
• ISSN: 0022-5142
• DOI: 10.1002/jsfa.2740031007

✦ Synopsis

Abstract

Small‐plot trials with formulations of ethyl ester and the trimethylamine salt of 2 : 4‐dichlorophenoxyacetic acid (2,4‐D) are described. These showed that the ester was more effective than the amine salt against individual weed species at rates of application of 1/2 lb./acre or less. The final result on mixed weed populations was considerably influenced, however, by the species present and the intensity of competition.

These results are shown to be applicable on a larger scale by a brief summary of the results of more extensive field trials. Information on crop toxicity obtained from these trials shows that the ester offers a narrower safety margin but there is little risk of damage in wheat and barley if a rate of 1/2 lb./acre is not exceeded.

The danger from volatility is shown to be slight in this country and the importance of formulation is very briefly discussed.

Finally it is shown that these results compare fairly closely to official American recommendations.