. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. F. S. D. A., B. E. Bill. 07, Part I. D. P. I. I., March 31, 1911, PAPERS ON DECIDUOUS FRUIT INSECTS AND INSECTICIDES SPRAYING EXPERIMENTS AGAINST THE GRAPE HOPPER IN THE LAKE ERIE VALLEY. LEAF- By Fred Johnson, Agent and Expert. INTRODUCTION. The grape leafhopper {Typhlocyha comes Say) (fig. 1) is an enemy of grapevines familiar to almost every vineyardist, and doubtless at times it has become so numerous and destructive in his vineyard as to cause him considerable anxiety. Usually, however, in the vine- yards of
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. F. S. D. A., B. E. Bill. 07, Part I. D. P. I. I., March 31, 1911, PAPERS ON DECIDUOUS FRUIT INSECTS AND INSECTICIDES SPRAYING EXPERIMENTS AGAINST THE GRAPE HOPPER IN THE LAKE ERIE VALLEY. LEAF- By Fred Johnson, Agent and Expert. INTRODUCTION. The grape leafhopper {Typhlocyha comes Say) (fig. 1) is an enemy of grapevines familiar to almost every vineyardist, and doubtless at times it has become so numerous and destructive in his vineyard as to cause him considerable anxiety. Usually, however, in the vine- yards of the Lake Erie Valley, serious dep- redations by this pest are confined to some- what limited areas adjacent to rough lands and woodlots. A few vines at the ends of the rows or a few rows along the outside of vineyards will be injured year after year until the crop yield on these vines is consid- erably reduced. Under these conditions it receives slight attention from the average vineyardist and is regarded as more or less of a negligible quantity. Periodically, how- ever, some as yet unknown conditions seem to favor its multiplication and it spreads over wide areas causing injury amounting to many thousands of dollars. Such a con- dition obtained in the vineyards of Chautau- qua County, in the vicinity of Westfielcl, N. Y., during the seasons of 1901 and 1902, when many hundreds of acres of vineyards suffered greatly from the injury wrought by this pest. In 1903 the insect disappeared to a considerable extent and serious injury was again confined to limited areas until the season of 1910. The insect is now manifestly on the increase and during the past season (1910) spread through large blocks of vineyard. In fact, 1. Fig. 1.—The grape leafhopper (Typhlocyha comes var. colo- radcnsis) : Adult. Greatly enlarged. (Original.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectentomology
