Effect of Phenoxy Herbicides on Cold Hardiness of Winter Wheat

Abstract

In a controlled environment experiment, five phenoxy herbicides were sprayed at two rates on 14-day-old winter wheat (Triticum aestivum L. emend Thell ’Norstar’). After 7 additional days of active growth, the plants were cold-hardened for 14 days and then subjected to a freezing test. Four of the herbicides — MCPA amine, 2,4-D ester, 2,4-DB, 2,4-D amine — significantly reduced the cold hardiness of winter wheat whereas diclofop methyl had a minor effect. The reduction in hardiness was greater at the higher rates of application than at the lower rates.

2,4-D Past, Present, and Future: A Review

“…Application near anthesis can cause sterility. Freyman and Hamman (1979) observed that treatment with 2,4-D can adversely affect the cold tolerance of winter wheat. Application on winter cereals in late fall during periods of inactive growth is not advised as significant injury and yield reduction can result (Loux 2010).…”

CONTROL OF STINKWEED (Thlaspi arvense) AND FLIXWEED (Descurainia sophia) IN WINTER WHEAT (Triticum aestivum)

“…Spring-applied herbicides often give unsatisfactory control of these weeds (Molberg 1971b (Robison and Fenster 1973;Freyman and Hamman 1979) or cause growth abnormalities and sometimes reduce yields (Large and Dillon Weston 1951 ;Scragg 1952) while others report no adverse effects (Fowler et al 1986;Derksen et al 1989). Metribuzin will also control broadleaved winter annual weeds in winter wheat but the degree of crop tolerance depends upon cultivar, soil type, and environmental conditions (Runyan et al 1982; Swan and Whitesides 1988 For personal use only.…”