1090 ACARINA 



CATALOG OF INSECTS INJURIOUS TO CRATAEGUS 3 

 ACARINA 



armatus Can., Epetrimerus Fam. Phyllocoptidae 



Host Crataegus oxyacantha. 

 Injury Forms galls on leaves. 

 Distributio i Europe. 4 



References Houard, C. Les zoocecides des plantes d'Europe, 1 : 515. 1908. 

 Theobald, F. V. Board Agr. London. Journ. 20:106-116. 1913. 



calycobius Nal., Eriophyes Fam. Eriophyidae 



Host Crataegus oxyacantha. 



Injury Deforms leaf buds and causes them to remain closed. 



Distribution Europe. 



Reference Ross, H. Die Pflanzengallen Mittel- und Nordeuropas, p. 132. 1911. 



crataegi Can., Eriophyes Fam. Eriophyidae 



Host Crataegus oxyacantha. 



Injury Forms galls on leaves, on both upper and lower surfaces. A single leaf may 



have a hundred galls on it. 

 Distribution Europe. 

 Reference Connold, E. T. British vegetable galls, p. 132. 1902. 



crataegi-vermiculus Walsh, Eriophyes Fam. Eriophyidae 



Hosts Crataegus tomentosa, C. crus-galli. 



Injury Forms curled leaf galls on upper side of leaf. 



Distribution North America. 



Reference Walsh, B. D. Ent. Soc. Philadelphia. Proc. 6:227. 1866. 



goniothorax Nal., Eriophyes Fam. Eriophyidae 



Synonyms Erineum oxyacanthae Am., Erineum clandestinum Grev. 



Host Crataegus oxyacantha. 



Injury Forms galls on edges of lobes of leaf, causing them to curl downward and 



become thickened. 

 Distribution Europe. 

 References Kaltenbach, J. H. Pflanzenfeinde, p. 213. 1872. 



Connold, E. T. British vegetable galls, p. 138. 1902. 



pilosus Can., Tetranychus Fam. Tetranychidae 



Hosts Crataegus, Malus, Pyrus, Prunus. 



Injury Feeds on leaves, causing them to turn brownis\ 



Distribution Europe, North America. 



Reference Caesar, L. Can. ent. 47:57. 1915. 



pyracanthae Link., Eriophyes ?. .Fam. Eriophyidae 



Hosts Crataegus punctata, C. pyracantha. 



Injury Makes galls on leaves. Galls almost flat, reddish, covered with many fine, 



capitate hairs. 



Distribution North America. 

 Reference Chadwick, G. H. New York State Mus. Bui. 124:131. 1908. 



pyri Pagst., Eriophyes (Pear leaf blister mite) Fam. Eriophyidae 



Hosts Pyrus, Malus, Crataegus, Cydonia, Sorbus, Amelanchier. 

 Injury Makes yellowish or reddish blisters on leaves. 



1 The insects are grouped according to order, and arranged alphabetically by species within the order. 



