. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. SPRAYING AGAINST THE GRAPE LEAF HOPPER. rasults to check the development of the foliage and to retard the growth of those new shoots which spring from the canes near the lower w^ire of the trellis. This early retardation of growth is more important than would at first appear, for it is highly desirable that these new shoots springing from the canes near the lower wire of the trellis should make a thrifty growth during the early part of the season, since it is from them that canes for bearing the next season's cro
. Bulletin. Insects; Insect pests; Entomology; Insects; Insect pests; Entomology. SPRAYING AGAINST THE GRAPE LEAF HOPPER. rasults to check the development of the foliage and to retard the growth of those new shoots which spring from the canes near the lower w^ire of the trellis. This early retardation of growth is more important than would at first appear, for it is highly desirable that these new shoots springing from the canes near the lower wire of the trellis should make a thrifty growth during the early part of the season, since it is from them that canes for bearing the next season's crop of fruit are selected. This feeding of the overwintering adult "hoppers " continues for several weeks; in fact, many of them may remain upon the vines until some of the new generation has ma- tured. THE EGG STAGE. Egg la3dng by the overwintering fe- males does not com- mence in the vine- yards of the Lake Erie Valley until about June 1, aftei- the adults have been feeding upon the vines for several weeks. The eggs are deposited on the un- derside of the leaves. Thej are tucked un- der the skin indis- criminately as to lo- cation on the leaf and are very difficult to locate on those varie- ties possessing a heavy pubescence, as is the case with the Concord. The egg stage covers a period of about 10 days to 2 weeks. The period of egg deposition is obviously a long one, since newly emerged nymphs are present upon the foliage from the middle of June until late in October. Observations indicate, however, that the maximum deposi- tion must occur during the last three weeks in June and the first week in July, since the period when there is a maximum number of nymphs upon the leaves is included in a period from the last week in June until about August 1, at which latter date many fully developed nymphs are making their final Fig -Grapo leaf showing final ivsult of attack by grai)o Icafhopper; leaf withered and brown before fruit is niattire. (Original.) the the. Plea
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