Abstract
Abstract In the southern San Fernando Valley in Los Angeles, Calif., 64 Siberian elm parkway trees were used in a RCB experiment with four replications. The trees were on 35 city blocks within a 24-square-mile area. All treatments, except on “on demand” treatments, were applied during the week of 9 May; “on demand” treatments were applied on 30 Jun. and were in response to the first citizen complaint about beetle damage. Trunk spray in a band between 4 and 7 ft of height with a high pressure spray wand also included blackstrap molasses at 2 qt/100 gal; the intended target was larvae migrating to the ground for pupation. All treatments, except trunk spray alone, were to whole tree. All treatments were buffered to pH 6.0. Samplings were on the dates indicated. A sample from each tree of a two-tree replicate included the 10 most-distal leaves of 10 peripheral twig terminals obtained with a 10-ft pole pruner. Only data on number of larvae were transformed to log10(n + 1).
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