| Abstrakt: |
The herbicide 2, 4-D was applied post-emergently in a field where the herbicide was applied for the past 40 years. The treatments included spraying 2, 4-D isooctyl ester (62% EC) at 0, 0.6, 1.2, 2.4 and 3.6 kg/ha. The treatments were arranged in a completely randomized Latin Square Design with five replicates. Soil samples were collected from two field sites : site 1 where the herbicide was historically applied annually and site 2,a nearby field where the herbicide was never applied. Soil samples from each site were placed in pots in the greenhouse. The herbicide was applied post-emergently to weeds from both the sites at rates described above. The results indicated that the following weeds tolerated the highest rate of herbicide application : forked mouse-ear chickweed, Cerastium dicotomum L. cone catchfly, Silene conoidea L. and cow cockle, Vaccaria pyramidata Medik. This is the first report on 2, 4-D-tolerant Caryophyllaceae weed species. [ABSTRACT FROM AUTHOR] |
