New York Agricultural Experiment Station. 293 



on a uuinber of species of plants. The most important are rasp- 

 berry, blackberry, strawberry, burdock (Arctium sp.), catnip 

 (Nepeta cataria), Virginia creeper (Psedera quinquefolia), cur- 

 rant and gooseberry. Their preferences are in the order given, 

 raspberries always being favored when in foliage while straw- 

 berries are sought if the raspberries are not in leaf. The observa- 

 tions made during 1912 in a locality where the chosen plants ex- 

 isted showed that from the time of the first warm weather, about 

 April 15 to May 6, the principal feeding was on the leaves of the 

 wild strawberry (Fragaria sp.) (Plate VII, fig. 2), and that on 

 May 6 they began to feed on the lower leaves of the black rasp- 

 berry, which were at this time about one and a half inches long. 

 At this latter date the Burbank plum and sweet cherry were com- 

 ing into bloom, while the buds of the Concord grapes were just 

 bursting. By May 10 most of the hoppers were found feeding on 

 the foliage of raspberries, principally on the lower leaves, very few 

 being found more than half way to the top of the bushes. By 

 May 15 all portions of the foilage were attacked (Plate VII, 

 fig. 1). Migration of the insects from raspberries to grapes began 

 May 20, at which time grape foilage appeared as in Plate VIII, 

 fig. 1. This movement of the insects was at its height about 

 May 24, when grapes were at the stage of growth shown in Plate 

 IX. By June 1, practically all of the leaf-hoppers had made their 

 way to the grape vines. 



An interesting observation was taken May 24 in a small area 

 of woodland which sheltered many leaf-hoppers during the winter. 

 There were no raspberries, blackberries nor strawberries present 

 in the vicinity so that the hoppers were compelled to feed on 

 other plants. A few vines of the Virginia creeper served as food 

 for a number of the insects, but most of them had been feeding on 

 the leaves of the beech (Fagus grandifolia) and sugar maple 

 (Acer saccharum). Both species of trees appeared to be badly 

 infested on the lower branches, but, however, beech and maple 

 usually escape attacks from this insect when the favorite food- 

 plants as listed above are present. 



