. The Canadian horticulturist [monthly], 1893. Gardening; Canadian periodicals. kr.^^Zt E briefly referred to the pear tree psylla, in our report of the Rochester meeting, as being one of the most dreaded enemies of the pear grower. It was imported from Europe upon some young pear trees in 1832, by Dr. Plumb, of Salisbury, Conn., and it has gradually spread over the United States until it has reached the Missis- sippi Valley, and it is quite abundant in some parts of New York State. Mr. Powell, an exten- sive fruit grower of Ghent, New York State, reports that in 1892 these insects reduced his
. The Canadian horticulturist [monthly], 1893. Gardening; Canadian periodicals. kr.^^Zt E briefly referred to the pear tree psylla, in our report of the Rochester meeting, as being one of the most dreaded enemies of the pear grower. It was imported from Europe upon some young pear trees in 1832, by Dr. Plumb, of Salisbury, Conn., and it has gradually spread over the United States until it has reached the Missis- sippi Valley, and it is quite abundant in some parts of New York State. Mr. Powell, an exten- sive fruit grower of Ghent, New York State, reports that in 1892 these insects reduced his pear crop from an estimated yield of twelve hundred barrels to an actual yield of less than one hundred barrels of marketable fruit. The indications of its presence are the stunted growth of the trees, withering of young shoots, sickly appearance of the trees, the leaves turning yellow and the fruit stunted in growth, which after midsummer fall from the tree. A fluid, called honey dew, accompanies their presence upon the trees. Mr. Slingerland, who published a bulletin from the Cornell Experiment Station upon this insect, states that an orchard which he visited in November, 1891, presented a deplorable appearance as though scorched by fire. Fig. 517 represents an immature form of the insect, or nymph, and fig. 518 the adult form, much enlarged ; the actual length being indicated by the line at the side. When first hatched, it is a translucent yellow, scarcely visible to the naked. 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 St. Catharines, E. S. Leavenworth
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