Abstract
The effects of five residual herbicides and two mixtures of herbicides on tree and weed growth were studied in two trials over two consecutive seasons in a young peach orchard at Bathurst, New South Wales. In the first trial, dichlobenil at 4.5 and 9.0 kg ha-1 increased tree growth and suppressed weeds, but the residual effects of the low rate were short; simazine (2.2 kg ha-1), trifluralin (2.2 kg ha-1) and simazine (1 1 kg ha-1) plus trifluralin (1.1 kg ha-1) also reduced weed incidence but did not improve tree growth. In the second trial, terbacil (2.2 kg ha-1) and mixtures of diuron (1.1 kg ha-1) and terbacil at 1.1 or 2.2 kg ha-1 effectively controlled weeds, giving faster tree growth. Terbacil (1.1 kg ha-1) and diuron (1.1 kg ha-1) suppressed broadleaf but not grass weeds. Terbacil (1.1 kg ha-1) improved tree growth only in the second season; diuron (1.1 kg ha-1) did not affect tree growth. None of the peach trees displayed toxic symptoms. The main weeds present in the trial site were: Amaranthus powellii, Chenopodium album, Polygonum aviculare, Lepidium hyssopifolum, Lactuca serriola, Rumex acetosella, Sonchus oleraceus, Plantago lanceolata, Cynodon dactylon, Bromus sp, and Eragrostis sp.
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