Field test of acephate against two Douglas-fir Chirstmas tree pests
R. G. Mitchell, John Neisess, Pacific Northwest Forest and Range Experiment Station (Portland, Or.), United States. Forest Service
Dept. of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station, 1977 - Nature - 8 pages
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60 percent bud acephate aooleyi populations aphid per l00 aphid per needle appeared applied attack bud burst treatment burned burst buds burst Post-bud burst Check Low Medium check trees Christmas tree classification control cooleyi per tree Crooke damage data days after spraying disappointing distal dosage Douglas-fir needle midge effective endosulfan feed gall aphid growth Guidelines heavy population infestation Injury insect insecticide interval July l00 needles larvae Low Medium High Medium High Mean midge populations number observed occurred Oregon and Washington percent bud burst perio d Treatment pests phytotoxic plantation plastic-covered screen population categories population reduction Portable Pre-bud burst Post-bud pre-bud burst treatment predators procedure pseudotsugae Condrashoff rain randomly reduce sample unit second spray period second treatment selected severe significantly greater spring statistically systemic Table Temperature test treated trees treatment at 60 treatment before bud Treatment dose trees had burst trees treated twigs unsprayed western Oregon winter yellow