. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AFFECTING CITRUS FRUITS 453 in its control. Sometimes as high as 80 per cent, of the scales will show the small hole whence the adult parasite has escaped from its .host. Yet the numbers of living scales that are left are great enough often to make it necessary to use some artificial methods of control. Most growers rely on fumigation to con- trol this pest, but in some cases, especially in the case of young trees, it is practical to spray. The kerosene sprays discussed on page 416, have been found most sa
. Elementary textbook of economic zoology and entomology. Zoology; Insect pests. INSECTS AFFECTING CITRUS FRUITS 453 in its control. Sometimes as high as 80 per cent, of the scales will show the small hole whence the adult parasite has escaped from its .host. Yet the numbers of living scales that are left are great enough often to make it necessary to use some artificial methods of control. Most growers rely on fumigation to con- trol this pest, but in some cases, especially in the case of young trees, it is practical to spray. The kerosene sprays discussed on page 416, have been found most 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 Kellogg, Vernon L. (Vernon Lyman), 1867-1937; Doane, Rennie Wilbur, 1871-. New York, H. Holt and company
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