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Herbicides for removal of natural regeneration of radiata pine pinus radiata in second rotation plantations



Herbicides for removal of natural regeneration of radiata pine pinus radiata in second rotation plantations



Plant Protection Quarterly 1(2): 67-70



Results are reported from a study carried out between 1979 and 1983 near Myrtleford in north-eastern Victoria [Australia], of the effectiveness of herbicides in controlling (killing or severely stunting) unwanted natural regeneration of radiata pine (Pinus radiata D.Don) after clearfelling of mature stands. Effective control of individual stems resulted when the foliage was sprayed to drip-off point in spring with any of the following chemicals: amitrole plus ammonium thiocyanate at 17.5 g and 15.4 g, respectively, dicamba at 12.6 g, and dicamba derivative at 22.7 g, fosamine ammonium at 60.0 g, glyphosate at 18.0 g, and paraquat at 2.4 g a.i. each in 1.0 L water carrier. Higher concentrations of the same chemicals were also effective when applied at other times of the year. For the control of thickets (1-2 m tall) of naturally regenerating radiata pine, fosamine ammonium applied as Krenite at 125 L ha-1 plus 1000 L ha-1 water carrier, produced the best result. Dicamba at 25 kg ha-1 and amitrole plus ammonium thiocyanate at 35 and 28 kg a.i. ha-1 were less effective. Being a contact herbicide, fosamine ammonium failed to control smaller trees shielded in the thickets by adjacent stems. Thus this chemical must be applied when the trees are small and the canopy is still open. At present, the high cost of fosamine ammonium at effective rates, limits its usefulness in the control of radiata pine thickets. Further work is therefore necessary to increase its effectiveness and thereby reduce the cost of treatment.

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