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Response of teff (Eragrostis tef(Zucc.) Trotter) to 2, 4‐D and MCPA at various growth stages
Author(s) -
MERSIE WONDIMAGEGNEHU,
PARKER C.
Publication year - 1983
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1983.tb00520.x
Subject(s) - mcpa , eragrostis , panicle , shoot , apex (geometry) , biology , horticulture , dry matter , rootstock , agronomy , botany , weed control
Summary Teff ( Eragrostis tef (Zucc.) Trotter) cv.DZ‐01‐ 354 was sprayed at one‐, three‐, four‐, five‐ and six‐leaf stages with 2.4‐D (amine salt) and MCPA (potassium salt) each at 0.75 and 1.5 kg a.e. ha −1 . Teff was also grown in different temperature regimes to see the relation between apical and vegetative development. Photomicrographs were made to determine the stage of development of the growing point and dry matter measurements were made to assess the effects of the herbieide. Teff sprayed at the one leaf stage was killed by both herbieides. At the three‐ and four‐leaf stages 2, 4‐D at both rates and MCPA at 1.5 kg a.i. ha −1 caused severe leaf deformities and reduced dry weights. Less severe effects were noted at the five‐leaf stage indicating that teff was then more tolerant to these herbicides. This coincided with a fully elongated shoot apex. However, when sprayed at the six‐leaf stage there was evidence of herbicide‐induced panicle deformities. Teff was more susceptible to 2, 4‐D than to MCPA and both affected the roots more than the shoots. A close correlation was found between leaf number and the development of shoot apex under all the different temperature and day length conditions.