. The grape leafhopper in the Lake Erie Valley. Fig. 9.—Outline of eggs, a and 6, of grape leafhopper on underside of grape leaf with pubescence pushedaside. Greatly enlarged. (Original.) the adult, but differing from the mature parent in that it does notpossess wings. It attains its growth by casting its skin in a series offive molts. These five nymphal stages are represented in Plate time required for the nymph to reach maturity varies greatlywith the different individuals. During the season of 1912 rearingswere made of a large number of nymphs. First stage.—The newly hatched nymph has
. The grape leafhopper in the Lake Erie Valley. Fig. 9.—Outline of eggs, a and 6, of grape leafhopper on underside of grape leaf with pubescence pushedaside. Greatly enlarged. (Original.) the adult, but differing from the mature parent in that it does notpossess wings. It attains its growth by casting its skin in a series offive molts. These five nymphal stages are represented in Plate time required for the nymph to reach maturity varies greatlywith the different individuals. During the season of 1912 rearingswere made of a large number of nymphs. First stage.—The newly hatched nymph has a white body and redeyes. It does not run very rapidly at first, but moves over theunderside of the leaf with rather an uncertain, wobbly gait. Thenumber of days required for this stage, from hatching to the first THE GRAPE LEAFHOPPER IN THE LAKE EEIE VALLEY. 15. Fig. 10.—The grape leafhopper: a and b, Eggs, par-tially shown under pubescence; c, egg broughtinto view; d, greatly enlarged egg. All enlarged.(Original.) molt, may vary anywhere from 3 to 15. The majority of the nymphs, however, complete the stage in from 3 to 5 days. Second stage.—In the second nymphal stage the insect becomes more active. The eyes lose some of their red color and the body assumes a yellowish tint, and at the base of the thorax there appear signs of the wing pads in the form of lateral buds. The length of this stage may vary from 1 to 7 days. The majority of nymphs complete the stage in 3 to 4 stage.—The insect in the third stage moves about very ac-tively when disturbed, running with a sidewise motion. Very rarely can one be made to hop for even the shortest distance. The red has disappeared from the eyes, and the yellow markings on the thorax have now become quite pronounced. The wing pads extend to about the caudal margin of the first abdominal s
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Keywords: ., bookauthorjohnsonfred, bookcentury1900, bookdecade1910, bookyear1
