. Control of scale insects and mealybugs on ornamentals. Scale insects; Pseudococcus. Fig. 6. Adult female fletcheri scales and eggs on taxus. to the outer circumference of the branches. The granules were sifted evenly into the soil in the saucer-like depression and covered with the dirt that had been removed. The treatment was drenched with water four times during the following week. The evaluation was made by counting dead and live scales on eight inch (aver.) twigs per rate of treatment and check. Many dead scales dropped from the sprayed plants and were not accounted for. There were 19
. Control of scale insects and mealybugs on ornamentals. Scale insects; Pseudococcus. Fig. 6. Adult female fletcheri scales and eggs on taxus. to the outer circumference of the branches. The granules were sifted evenly into the soil in the saucer-like depression and covered with the dirt that had been removed. The treatment was drenched with water four times during the following week. The evaluation was made by counting dead and live scales on eight inch (aver.) twigs per rate of treatment and check. Many dead scales dropped from the sprayed plants and were not accounted for. There were 19 dead and 51 live scales on the plants which received the 6 oz. treat- ment and 34 dead and 13 live ones on those treated with 12 oz. A count of live scales before treatment indicated an average of 79, with a range of 8 to 180 on an average 5 inch twig. Soil treatment with Di-Syston was not as effective as some of the foliar sprays. Fletcher Scale, Lecanium fletcheri Cockerell Biology. Lecanium fletcheri scale, sometimes referred to as the arborvitae soft scale or Fletcher scale, is widely distributed, occurring on many varieties of plants growing outdoors and under glass. At first the species was of little importance, found principally on arborvitae. However, as more and more species and varieties of taxus were propa- gated in nurseries, the scale insect became more of a pest on them than on other plants. When branches and the underside of the foliage are heavily infested with scales, serious weakening of a plant may occur. Under these conditions needles may lose color and drop prematurely. The insects secrete honeydew which acts as a culture media for sooty fungus resulting in unsightly blackening of affected plants. 12. 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 : Connectic
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