Some Effects of 2,4-D on Wheat Yield and Root Growth

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Abstract
1. The isopropyl ester of 2,4-D is more toxic to wheat than is the triethanolamine salt. 2. Spraying wheat with 2,4-D should be avoided in the seedling and flowering stages. 3. Wheat which yielded poorly as a result of heavy rust infection failed to show additional reduction following 2,4-D treatment. 4. Greatest yield reductions were caused in the variety Brevor. 5. The application of 2,4-D to the foliage of seedling Brevor wheat caused abnormal root growth. 6. Primary root elongation was inhibited by all foliar applications of 2,4-D except the 500-p.p.m. amine salt, which appeared to stimulate growth. 7. Lateral roots of treated plants were increased in number, but their elongation was inhibited. 8. Applications of 2,4-D directly to roots caused only a localized response.

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