For trials on the protection of radiata pine round wood (logs or peeler bolts) during storage and transport to Japan from New Zealand, three kinds of antisapstain chemicals were applied as spray treatments on logs.
The test logs were obtained from Kaingaroa Forest, near Rotorua, New Zealand. Just after cutting 15-18 years old radiata pine trees, the logs were debarked for the treatment to be effective. The antisapstain chemical solution was sprayed on the whole surface of the logs on 8 October 1982. The chemi-cals for the treatment were the Japanese antisapstain chemicals; IFG; IF 1000 plus Gardona insecticide, TDG; which consisted of Daconil, Captafol, Tributyltinphthalate and Gardona, and New Zealand commercial formulation; copper-8-quinolinolate (0.025% as Cu) with micro crystaline wax. The composition of the Japanese antisapstain chemicals is shown in Tables 1 and 2.
These treated logs were sent from Mt Maunganui on a chip ship at the beginning of December and arrived at the sawmill neighbourhood of Kure on 27 December. They were sawn on 21 January 1983. Three or four 20-mm flitches were sawn off one side and then the remainder were sawn across in 20-mm flitches as shown in Fig. 1.
Sapstain areas of all the flitches were copied on to polyethylene films and the areas were calculated from the weight of the films. The results of the measurements of sapstain areas are shown in Figs. 2-5 and Tables 2-6. Of the treatments with antisapstain chemicals, IFG gave the best and TDG gave good protection over 2 months, but copper-8-quinolinolate was not effective as compared with untreated control.
After 9 months storage in which the remaining logs were exposed to the weather, they were sawn in the same manner. All flitches were fairly extensively sapstained, since they had knots and cracks and sapstain fungi grew from inside of the logs. It was however noticeable that on the flitches from the log treated with IFG there was a clear zone around the edges. This indicated the treatment with IF-1000 had been effective until the interior zones had become exposed.

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