. Bulletin. Natural history; Natural history. 160 Illinois Natural History Survey Bulletin Vol. 22, Art. 1 robust than male, but very similar in color and pubescence. Food Plants and Habits.—Breeds on dogwoods {Cornus stolonifera, C. paniculate and C. alternifolia) and cultivated pear {Pyrus communis) ; also reared from win- terberry {Ilex verticillata). The nymphs hatch when the leaves unfold and they feed. Fig. 165.— Neolygus communis, 9. on this tender foliage. On pears, the nymphs attack the young fruit as soon as it forms and continue to feed on it in preference to the leaves. All pears t
. Bulletin. Natural history; Natural history. 160 Illinois Natural History Survey Bulletin Vol. 22, Art. 1 robust than male, but very similar in color and pubescence. Food Plants and Habits.—Breeds on dogwoods {Cornus stolonifera, C. paniculate and C. alternifolia) and cultivated pear {Pyrus communis) ; also reared from win- terberry {Ilex verticillata). The nymphs hatch when the leaves unfold and they feed. Fig. 165.— Neolygus communis, 9. on this tender foliage. On pears, the nymphs attack the young fruit as soon as it forms and continue to feed on it in preference to the leaves. All pears thus punctured be- come knotty and scarred to such an extent that the fruit is unsalable. The nymphs are green, closely matching the color of the young fruit; this makes it difficult to see them. The nymphs mature in about 24 days, or, usually, by the middle of June in central Illinois. The adults, likewise, prefer to feed on the pears and contribute further to the destruction of the fruit. In New York, the author observed that the adult bugs were active agents in distributing pear blight among the trees, the blight developing about feeding punctures made by the bugs. Ovi- position occurs during the last week of June and up to the middle of July in New York, a few individuals probably laying after that date. The eggs are inserted under the bark of the new cambium layer (Knight 1915) ; in one place six eggs were found deposited in a mass. Most of the males die by the middle of July, but many females live until the end of that month. There is only one brood annually; the winter is passed in the egg stage and the nymphs appear again in the spring at the time the leaves unfold. In Nova Scotia a smaller, more slender form, variety novascotiensis Knight (1916fl, p. 349), is an important pest on apple fruit. Known Distribution.—Colorado and Idaho northward to Alberta and Minnesota, eastward to Ontario and Maine and south- ward to North Carolina. Illinois Records.—Antioch : Aug.
Size: 1329px × 1881px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
