Abstract
Summary The results of experiments carried out over a period of 12 months with various herbicides, applied mainly at the concentrations recommended by the manufacturers and at double these concentrations, indicate that both mature plants and seedlings of Hakea gibbosa, Cav., can be killed by spraying with 2 methyl 4 chlorophenoxyacetic acid, 2:4:5 trichlorophenoxyacetic acid and the sodium salts of both trichloroacetic acid and 2:4 dichlorophenoxyacetic acid. In most cases the addition of aromatic oils to the sprays appears to enhance the activity of the weed-killer present. In the concentrations applied the treatment is not economic when large areas are involved, but spraying with lower concentrations of 2:4 dichlorophenoxyacetic acid might prove economic if further investigated. There is little likelihood of erosion where these sprays are used as regeneration of the associated vegetation is relatively rapid and the plant remains are not uprooted from the soil.
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