pear louse

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• pear louse — noun : pear psylla …   Useful english dictionary

• pear psylla — noun also pear tree psylla : a yellowish or greenish jumping plant louse (Psylla pyricola) that is often destructive to the pear called also pear louse * * * a small jumping plant louse, Psylla pyricola, originally of Europe, that is a major pest …   Useful english dictionary

• pear psylla — noun Date: 1904 a yellowish or greenish jumping plant louse (Psylla pyricola) that is often destructive to the pear …   New Collegiate Dictionary

• pear psylla — a small jumping plant louse, Psylla pyricola, originally of Europe, that is a major pest of pears in the eastern U.S. [1900 05; < NL Psylla, genus name < Gk: flea] * * * …   Universalium

• Bark louse — (Zo[ o]l.) An insect of the family {Coccid[ae]}, which infests the bark of trees and vines. [1913 Webster] Note: The wingless females assume the shape of scales. The bark louse of the vine is {Pulvinaria innumerabilis}; that of the pear is… …   The Collaborative International Dictionary of English

• Flea-louse — n. (Zo[ o]l.) A jumping plant louse of the family {Psyllid[ae]}, of many species. That of the pear tree is {Psylla pyri}. [1913 Webster] …   The Collaborative International Dictionary of English

• Leaf louse — Leaf Leaf (l[=e]f), n.; pl. {Leaves} (l[=e]vz). [OE. leef, lef, leaf, AS. le[ a]f; akin to S. l[=o]f, OFries. laf, D. loof foliage, G. laub, OHG. loub leaf, foliage, Icel. lauf, Sw. l[ o]f, Dan. l[ o]v, Goth. laufs; cf. Lith. lapas. Cf. {Lodge}.] …   The Collaborative International Dictionary of English

• Tree louse — Tree Tree (tr[=e]), n. [OE. tree, tre, treo, AS. tre[ o], tre[ o]w, tree, wood; akin to OFries. tr[=e], OS. treo, trio, Icel. tr[=e], Dan. tr[ae], Sw. tr[ a], tr[ a]d, Goth. triu, Russ. drevo, W. derw an oak, Ir. darag, darog, Gr. dry^s a tree,… …   The Collaborative International Dictionary of English

• Wood louse — Wood Wood, n. [OE. wode, wude, AS. wudu, wiodu; akin to OHG. witu, Icel. vi?r, Dan. & Sw. ved wood, and probably to Ir. & Gael. fiodh, W. gwydd trees, shrubs.] [1913 Webster] 1. A large and thick collection of trees; a forest or grove; frequently …   The Collaborative International Dictionary of English

• jumping plant louse — any of numerous lice, of the family Psyllidae, that feed on plant juices and are sometimes pests of fruits and vegetables. Also called psylla, psyllid. [1900 05] * * * ▪ insect       any member of the approximately 2,000 species of the insect… …   Universalium

• pearpsylla — pear psylla n. A small plant louse, especially of the eastern United States and Pacific northwest, Psylla pyricola that is a destructive pest of pears, quinces, and similar species. * * * …   Universalium