Abstract
Granular formulations of oxadiazon alone and oxadiazon plus simazine were applied at three rates to 16 species of Australian native and exotic ornamental plants. Oxadiazon alone (2, 4 or 8 kg ha −1) produced no symptoms of phytotoxicity or reduced shoot dry weight (SDW) in any species. The combination of oxadiazon and simazine (4.0 + 1.0 or 8.0 + 2.0 kg ha −1, respectively) produced leaf-burn in half of the species and depressed SDW in Dampiera, Grevillea ‘Boongala Spinebill’, G. hookerana, G. ‘Pink Lady’, G. ‘Royal Mantle’, Helichrysum and Westringia. Even the lowest rate of oxadiazon and simazine (2.0 + 0.5 kg ha −1, respectively) reduced the SDW of Grevillea ‘Royal Mantle’, G. ‘Boongala Spinebill’ and Helichrysum. All herbicides provided >90% control of summer grass ( Digitaria sanguinalis), bittercress ( Cardamine hirsuta) and willow herb ( Epilobium sp.). None of the herbicide treatments significantly reduced the number of weeds of chickweed ( Stellaria media). There were no significant differences between herbicide types in the control of mouse-eared chickweed ( Cerastium glomeratum), but there was a significant herbicide-rate effect. The middle and highest rates provided 40 and 92% control, respectively.
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