. Control of scale insects and mealybugs on ornamentals. Scale insects; Pseudococcus. Fig. 8. Adult European elm bark scales on American elm. Fig. 9. Cottony egg masses of the beech bark scale (exposed and unexposed). Beech Bark Scale, Cryptococcus fagi (Baer.) Biology. The beech bark scale was first reported in America by Hewitt (1914) on ornamental European beeches Fagus sylvatica (L.) and on the native beech Fagus grandifolia. He declared that it was not a newcomer from Europe, and in all probability the species had been Table 5. Control of European elm scale with soil treatments Insecticid
. Control of scale insects and mealybugs on ornamentals. Scale insects; Pseudococcus. Fig. 8. Adult European elm bark scales on American elm. Fig. 9. Cottony egg masses of the beech bark scale (exposed and unexposed). Beech Bark Scale, Cryptococcus fagi (Baer.) Biology. The beech bark scale was first reported in America by Hewitt (1914) on ornamental European beeches Fagus sylvatica (L.) and on the native beech Fagus grandifolia. He declared that it was not a newcomer from Europe, and in all probability the species had been Table 5. Control of European elm scale with soil treatments Insecticide Rate, oz. per 1 inch caliper Ave. caliper of trees in inches Total length of twigs examined in inches Dead scales Per cent control Cygon 2 100 22 61 Cygon 4 82 24 50 Cygon 8 190 23 85 Di-Syston 2 59 4 Di-Syston 4 54 24 100 Di-Syston 8 198 18 Untreated1 236 0 x172 live scales were found on untreated twigs. 17. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Schread, John C. New Haven : Connecticut Agricultural Experiment Station
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