The durability of yellow-poplar and red maple treated with ACQ-B

Durability of yellow-poplar and red maple treated with ammoniacal copper qu aternary compound, Type B (ACQ-B) was evaluated in field plots in West Virg inia and Mississippi. Stakes were vacuum-pressure treated with ACQ-B to fou r retentions and placed at the test sites. Stakes were evaluated yearly acc ording to American Wood-Preservers' Association standards. The 3-year resul ts suggest that retentions above 0.2 pcf(as CuO) will result in satisfactor y performance of all species tested. Southern pine performed extremely well at all retentions above zero. All species exhibited increases in durabilit y performance as retentions increased.