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Excerpt from Controlled Field Test of Stabilized Pyrethrins Against the Western Hemlock Looper
Fifteen stations were established over a 6-acre area in a former clearcut. At each station we located a single hemlock tree 7 to 10 feet in height, erected a pair of wooden platforms (fig. And put a plastic drop cloth under each tree to catch larvae dropping from the foliage (fig. 2a). The platform was a 16-inch square of -inch plywood mounted on a short post 4 to 5 feet above the ground. A wire rack was attached to the platform to support several small branches of hemlock foliage about 4 inches above the surface. A tanglefoot barrier around the edge of the plywood prevented the escape of healthy larvae (fig. 2b).
Figure 1. -one of 15 stations consisting of one small hemlock tree and two paired platforms used for evaluating effect of stabilized pyrethrins on hem lock 100per.
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