. Bulletin of the Department of Agriculture. Agriculture. THE GKAPE LEAFHOPPER IN THE LAKE ERIE VALLEY. 11 was present in greater numbers than in the vineyards east of that city. This condition also existed in the vineyards surrounding San- dusky, Ohio. In vineyards on Kelleys Island, North Bass, South Bass, and Middle Bass Islands both T. comes and T. tricincta were very abundant and there were also a number of other species and varieties in abundance which were not common in vineyards on the mainland, the most common being T. vulnerata Fitch. It should be stated that in the vineyards ea
. Bulletin of the Department of Agriculture. Agriculture. THE GKAPE LEAFHOPPER IN THE LAKE ERIE VALLEY. 11 was present in greater numbers than in the vineyards east of that city. This condition also existed in the vineyards surrounding San- dusky, Ohio. In vineyards on Kelleys Island, North Bass, South Bass, and Middle Bass Islands both T. comes and T. tricincta were very abundant and there were also a number of other species and varieties in abundance which were not common in vineyards on the mainland, the most common being T. vulnerata Fitch. It should be stated that in the vineyards east of Cleveland, Ohio, the vines are nearl}^ all of the Concord variety, whereas west of that city there is a considerable percentage of Catawba and of Early Ohio, while around Sandusky, Ohio, and upon the islands the percentage of the Concord variety is small, Catawba benig the variety most commonly. Fig. 7.—Three nymphs of Ti/phlocyba tricincta on underside of grape leaf: a, Cast skin of nymph. Enlarged. (Original.) grown, as also Delaware, Ives Seedling, Elvira, and a number of ' other varieties used in wine making. In the vineyards on the main- land around Sandusky T. tricincta was the species present in destruc- tive numbers. T. conies was also present, but only in small numbers. Observations in the vineyards of Michigan during the seasons of 1911 and 1912 showed that T. tricincta is the predominant species in vine- yards surrounding Lawton and Paw Paw and in the vicinity of Ben- ton Harbor and St. Joseph. In the vineyards of Michigan T. comes is present in even smaller numbers than in the vineyards about San- dusky, Oliio. Although the development of these two species seems to be almost identical, adults of T. tricincta brought from the vicinity of Dover,. 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 wor
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