. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE YELLOW-HEADED LEAFHOPPEE. 55 PROBABLY AN INTRODUCED SPECIES. With the evidence at hand it appears quite certain that this species was introduced into the United States from a more southerly habitat. While the species might possibly have been overlooked by early collectors, it is too conspicuous a species where it occurs for this to be probable. Moreover the records would seem to indicate an advance toward the north since its first appearance in our Southern States. Its original description from Cuba, 1854, pr
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. THE YELLOW-HEADED LEAFHOPPEE. 55 PROBABLY AN INTRODUCED SPECIES. With the evidence at hand it appears quite certain that this species was introduced into the United States from a more southerly habitat. While the species might possibly have been overlooked by early collectors, it is too conspicuous a species where it occurs for this to be probable. Moreover the records would seem to indicate an advance toward the north since its first appearance in our Southern States. Its original description from Cuba, 1854, precedes any record here, while the early records refer to such southern localities as Texas and South Carolina, a distribution still holding in 1894, when Van Duzee's catalogue was published. In 1900, as recorded. Fig. 3.—Map sliowiug distribuUou of Vruculaciphala rcliculata in the United States. (Original.) by Prof. E. D. Ball after he had made an exhaustive examination of records and specimens, the species had not spread north of the Gulf States and South Carolina. Now, however, it is found north, in the Atlantic region to middle Virginia (1900) and in the ^lississippi Valley to southern Kentucky (Fulton in 1905). (See fig. 3.) That it is restricted climatically is evidenced by the slow progress made and its liinitation to the warmer zone, the line of its northward distribution agreeing very closely with that of the cattle tick. TREATMENT. While additional knowledge concerning the place of egg deposi- tion and development of nymphs and especially as to the number of generations diu'ing the ^a^ar may furnish a better basis for the recom- mendation of measures for control, we may very safel}'^ conclude that the depredations on wheat and oats could be very materially lessened. 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
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