Evaluation of Antisapstain Field Test Methods

摘要

Antisapstain formulations require field efficacy data for registration in some jurisdictions. Efficacy data are also needed to assist chemical suppliers in evaluating new formulations and to help sawmills select appropriate products. A standardized approach would increase the comparability of data, increase data acceptance more widely, and improve the chances of executing a reproducible and repeatable test. The American Wood Protection Association (AWPA) recently published a provisional evaluation method (PEM) for evaluating the efficacy of antisapstain formulations in a field test. This method needed to be tested before it could be standardized. The present work evaluates three antisapstain formulations using this method. For comparison, one of theantisapstain formulations was also evaluated using a modified version of the AWPA PEM, and using FPInnovations' internal antisapstain field test method used for over 20 years (the Tony Byrne method). In general, a statistically significant dose responsewas observed for most of the treatments at one, two, and four months regardless of the evaluation method used. Results were similar for stickered and close-packed samples in the AWPA PEM, and modified AWPA PEM. All of the methods were effective in evaluating antisapstain efficacy. However, the AWPA PEM was the easiest to set up and run. The alternative methods did not offer any advantages in the present test.