Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . The pear-psylla—a, pupa from under side, showing the thread-like piercing lancets;to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species ofwhich are exceedingly troublesome,—^.^., the pear-psylla,Psylla pyricola. This infests pear-trees in the more northernparts of the country, extending south to Maryland, thoughsouth of New York State it occurs in isolated patches only. Itdoes its injury, first, by sucking the juices of th
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . The pear-psylla—a, pupa from under side, showing the thread-like piercing lancets;to the right, a winged adult and stalked egg. cicada. They all belong to the family Psyllidce, some species ofwhich are exceedingly troublesome,—^.^., the pear-psylla,Psylla pyricola. This infests pear-trees in the more northernparts of the country, extending south to Maryland, thoughsouth of New York State it occurs in isolated patches only. Itdoes its injury, first, by sucking the juices of the plant and soweakening it; second, it exudes honey-dew in such quantity asactually to close the pores of the leaves and young bark, overwhich a fungus forms and checks growth. It commonly attacksthe stalk of the fruit, or the twig just where it is fastened, andthe result is nearly always a cessation of growth in the pear itselfThe species has several broods during the season, but winters as 138 AN ENTOMOLOGY. an adult in any available shelter,—under loose bark of trees, underrubbish, and, in fact,
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
