Abstract
The Arizona five-spined engraver, Ips lecontei Swaine, attacked ponderosa pine trees poisoned with a fast-acting silvicide containing cacodylic acid (dimethy]arsenic acid). The density of attack and subsequent mortality of the brood and attacking adults varied considerably with the time of year the trees were poisoned. August-treated trees attracted the greatest density of attacks, and the rate of beetle mortality was higher than in trees poisoned at any other time of the year.
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