The herbicidal activity of 2,4-D at the first time was reported by
a). Hammer and Tukey (1944)
b). Zimmernam and Hitchcock (1942)
c). Nutman and Blackman (1945)
d). None
a). Hammer and Tukey (1944)
b). Zimmernam and Hitchcock (1942)
c). Nutman and Blackman (1945)
d). None