. Elementary entomology. Entomology. THK TRUE BUGS 127 The psyllas, or jumping plant-lice {Psyllidae), look much like miniature cicadas, but are more nearly related to the true plant-lice, exuding sweet honey-dew like the plant-lice but differing from them in being very agile in the adult stage, giving a quick jump with their strong hind legs and flying off at the slightest disturbance, whereas the true plant-lice are exceedingly sluggish. The best-known example is the pear psylla {Psylla pyricola), the adult of which (Fig. 174, a) is not over a tenth of an inch long but which occurs in such e
. Elementary entomology. Entomology. THK TRUE BUGS 127 The psyllas, or jumping plant-lice {Psyllidae), look much like miniature cicadas, but are more nearly related to the true plant-lice, exuding sweet honey-dew like the plant-lice but differing from them in being very agile in the adult stage, giving a quick jump with their strong hind legs and flying off at the slightest disturbance, whereas the true plant-lice are exceedingly sluggish. The best-known example is the pear psylla {Psylla pyricola), the adult of which (Fig. 174, a) is not over a tenth of an inch long but which occurs in such enormous numbers that it sometimes entirely ruins large pear orchards by sucking the sap from the foliage. It has been most injurious in the Middle Adantic States. It exudes a large amount of honey-dew,. 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 Sanderson, Dwight, 1878-1944; Jackson, C. F. (Cicero Floyd), b. 1882; Metcalf Collection (North Carolina State University). NCRS. Boston, Ginn
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Keywords: ., bookcentury1900, bookdecade1, booksubjectentomology, bookyear1912
