. Manual of fruit insects. ated varieties, it alsoinfests the wild alpine currant. It was probably introducedinto America in the early part of the nineteenth century, butdid not attract attention until about 1857. The shining black, cucumber-shaped eggs, attached to thebark of the new growth, hatch soon after the leaves open. Theyoung lice crawl to the leaves and begin feeding on the undersurface; these Hce hatched from the eggs are all females andare kno\\Ti as stem-mothers. When mature they give V)irth toliving young, and each indi\idual is soon surrounded by a nu- CURRANT AND GOOSEBERRY INS
. Manual of fruit insects. ated varieties, it alsoinfests the wild alpine currant. It was probably introducedinto America in the early part of the nineteenth century, butdid not attract attention until about 1857. The shining black, cucumber-shaped eggs, attached to thebark of the new growth, hatch soon after the leaves open. Theyoung lice crawl to the leaves and begin feeding on the undersurface; these Hce hatched from the eggs are all females andare kno\\Ti as stem-mothers. When mature they give V)irth toliving young, and each indi\idual is soon surrounded by a nu- CURRANT AND GOOSEBERRY INSECTS 351 merous progeny. Through-out the summer only fe-males (Fig. 311) are pro-duced, and the young areborn alive. At first nearlyall of the lice are wingless,but as the leaves becomecrowded, winged femalesdevelop and migrate toother bushes. The lice become abun-dant by the middle ofMay in New York, andoften cover the entire under surface of the leaves (Fig. 313).The irritation of their combined punctures causes the leaf. Fig. 311. — The currant plant-louse, wing-less viviparous female. Enlarged.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbenefic, bookyear1915
