1090 ACARINA 
CATALOG OF INSECTS INJURIOUS TO CRATAEGUS3 
ACARINA 
anmatusy © an Nek Petnumenusnmriarn eerste eee neice eee Fam. Phyllocoptidae 
Host — Crataegus oxyacantha.  _ 
Injury — Forms galls on leaves. 
Distributio 1 — Europe. 
Referenczs — Houard, C. Les zoocecides des plantes d’Europe, 1:515. 1908. 
Theobald, F. V. Board Agr. London. Journ. 20:106-116. 1913. 
CUCL KUS INEM CJR MMW. Gs gone cotoce bob ondodsm sudan dogboo loos Fam. Hriophyidae 
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. 
CRALCEGINEC AME VE TVONICS Mets eral me elec ee Yin nN tsecl ntact erent ULE aa ena Fam. Hriophyidae 
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, Hriophyes... 10.0. 00.0 eco he ee ees 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. 
goniothorac: Nal aeHinopnyesisieis: aie ee cece enn erie aoe Fam. Eriophyidae 
Synonyms — Erineum oxyacanthae Am., Hrinewm 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. 
(MOSS CENien ACHONDO A Woe sa Ulcer or obis pe dic og ak eS Se eR od Gen abcd a do.5 06 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 Muinike HPO hy es nicer seit gays Cyne ts eit oa eae ae 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. Bul. 124:131. 1908. 
pyri Pagst., Hriophyes (Pear leaf blister mite)....................00005 Fam. Eriophyidae 
Hosts — Pyrus, Malus, Crataegus, Cydonia, Sorbus, Amelanchier. 
Injury — Makes yellowish or reddish blisters on leaves. 
? The insects are grouped according to order, and arranged alphabetically by species within the order 
