Chemical control of young, natural, radiata pine regeneration.  D. W. Flinn, G. Minko and L. Barrand.  June 1982.  7 pp. (unpubl.)

SUMMARY

Trichloroacetate, paraquat + diquat, and two formulations of dicamba were evaluated for control of young, natural regeneration of radiata pine (Pinus radiata D. Don) in a fire-killed stand at Rennick, South-western Victoria. Each herbicide was applied at two rates in spring when the regeneration was about 5 cm high; this was repeated in the following autumn when the regeneration was about 14 cm tall. The density of the regeneration was about 250 000 plants ha^-1.

Total control was to obtained with either 4.0 kg ha^-1 active ingredient (a.i.) dicamba as the dimethylamine salt or 0. 5 kg ha^-1 a.i. paraquat + 0.25 kg ha^-1 a.i. diquat, applied in spring at a spray volume of 500 l ha^-1. None of the other treatments provided adequate control when applied in autumn.

On the basis of height growth and mortality of radiata pine seedlings planted soon and sometime after herbicide application, it was concluded that sites treated with herbicides in the first spring are best re-planted in the following winter.

Also published:

Flinn, D.W. and Minko, G. (1983)  Chemical control of natural seedling regeneration of radiata pine (Pinus radiata D. Don).  Aust. Weeds 2 (2): 53-5.