1098 HEMIPTERA 



Injury Sucks juice from opening buds of fruit trees in early spring. 



Distribution Europe, North America. 



References Leonardi, G. Gli insetti 4: 228. 1901. 



Baker, A. C. Journ. agr. res. 18:311. 1919. 



pallidus Fb., Idiocerus Fam. Cicadellidae 



(See page 1062.) 



pellucida Uhl., Diaphnidia : . Fam. Miridae 



(See page 1055.) 



peregrina Forst., Psylla Fam. Psyliidae 



Synonym Psylla crataegicola Flor. 



Hosts Crataegus oxyacantha, Carpinus betulus. 



Injury Sucks juice from young shoots and foliage. 



Distribution Europe, Asia. 



Reference Aulmann, G. Psyllidarum catalogus, p. 22. 1913. 



perniciosus Comst., Aspidiotus (San Jos6 scale) Fam. Coccidae 



Hosts Many woody plants, including Crataegus and other Malaceae. 

 Injury May incrust bark and kill trees in favorable weather. 

 Distribution Asia, North America, South America, Australia, Hawaii. 

 References Sorauer, P. Handbuch der Pflanzenkrankheiten 3 : 690. 1913. 

 Glenn, P. A. State Ent. Illinois. Kept. 28:87. 1915. 



piri Licht., Aspidiotus Fam. Coccidae 



Hosts Pyrus, Malus, Crataegus, Fraxinus, Prunus. 



Injury May incrust branches and thus weaken or kill them. 



Distribution Europe, Asia Minor. 



References Lindinger, L. Die Schildlause, p. 214. 1912. 



Sorauer, P. Handbuch der Pflanzenkrankheiten 3:690. 1913. 



pomi De Geer, Aphis (Green apple aphis) Fam. Aphididae 



Synonyms Aphis maii Fabr., A. oxyacanthae Schr. 



Hosts Malus, Crataegus, grasses. 



Injury Sucks sap, causing leaves to curl, but no discoloration appears. 



Distribution Europe, North America. 



References Kaltenbach, J. H. Pflanzenfeinde, p. 202. 1872. 



Matheson, R. Cornell Univ. Agr. Exp. Sta. Memoir 24 : 686. 1919. 



pratensis Linn., Lygus Fam. Miridae 



(See page 1055.) 



provancheri VanD., Idiocerus Fam. Cicadellidae 



Hosts Crataegus, Malus, Pyrus, Cydonia. 



Injury Nymphs and adults suck juice from foliage. 



Distribution North America. 



References Leonard, M. D. Journ. econ. ent. 8:415. 1915. 



Van Duzee, E. P. Catalog of Hemiptera, p. 580. 1916. 



pruinosum Coq., Lecanium (Frosted scale) Fam. Coccidae 



Hosts Many woody plants, including Crataegus. 



Injury Principal injury from smutty fungus growing on honeydew secreted by insects 



on fruit and foliage. 

 Distribution North America. 

 References Sanders, J. G. Journ. econ. ent. 2:442. 1909. 



Essig, E. O. Injurious and beneficial insects of California, p. 149. 1915. 



prunifoliae Fitch, Rhopalosiphum (Apple bud aphis) Fam. Aphididae 



Synonyms Aphis avenae (of American authors), Aphis fitchii Sand. 



