to beech; the southern red mite, O. ilicis (McGregor), damages azalea and 
camellia; O. aceris (Shimer) is sometimes a serious pest of maples; O. letchworthi 
Reeves occasionally seriously injures hophornbeam; O. newcomeri (McGregor) 
often seriously infests serviceberry; O. cunliffei Pritchard & Baker feeds on longleaf 
pine in Florida; O. boudreauxi Pritchard & Baker feeds on baldcypress in the South; 
and O. propetes Pritchard & Baker feeds on oaks from Washington, D.C., to North 
Carolina. 
The carmine spider mite, 7etranychus cinnabarinus (Boisduval), 1s a common 
and widely distributed species that feeds on a great many species of plants, trees, 
and ornamentals. Several generations are produced during the summer months, 
often giving rise to tremendous populations. Heavily infested plants may be entirely 
defoliated, especially during hot, dry weather. 7. homorus Pritchard & Baker feeds 
on hickory and ash in North Carolina; 7. magnoliae Boudreaux occurs on magnolia 
and yellow-poplar in Louisiana; the fourspotted spider mite, 7. canadensis 
(McGregor), feeds on elm, basswood, horsechestnut, Osage-orange, and poplar 
throughout the Eastern United States and southern Canada; and the Schoene spider 
mite, 7. schoenei McGregor, infests elm and black locust throughout the Eastern 
United States. 
The genus Eotetranychus also contains a number of common and frequently 
important species. F. populi (Koch) and E. weldoni (Ewing) are found on poplars 
and willows; E. hicoriae (McGregor) occurs on pecan, hickory, horsechestnut, and 
various Oaks; F. matthyssei Reeves attacks elm in New York. Heavy infestations 
may cause severe browning and cupping of the undersides of leaves. E. querci 
Reeves has caused severe browning of pin oaks in New York. 
Platytetranychus multidigituli (Ewing) feeds on the leaves of honeylocust, caus- 
ing them to turn yellow, and P. thujae (McGregor) attacks northern white-cedar, 
juniper, and baldcypress. Eurytetranychus buxi (Garman) is a serious pest of 
European boxwood. The leaves of infested plants become bronzed, then wither and 
sometimes fall prematurely. 
The family Eriophyidae contains a number of tree-infesting species (66/). Many 
produce open pouchlike or blisterlike galls on the twigs and leaves of their hosts. 
Some cause a rusting of infested leaves, and certain others feed on buds. A few of 
the more common and important tree-infesting species are discussed here. 
The maple bladdergall mite, Vasates quadripedes Shimer, is a common spe- 
cies. It ranges in length from about 0.05 to 0.2 mm and feeds on the undersurface of 
silver maple leaves, causing the formation of pouchlike or bladderlike galls up to 3 
mm in diameter (fig. 10). At first, these galls are light colored or yellowish green. 
Later, they are reddish to almost black and look for all the world like miniature 
green peppers standing on stalks above the leaf surface. Heavily infested leaves are 
often distorted. The related species, V. aceris-crummena (Riley), produces slender, 
fusiform, or spindle-shaped galls about 5 mm long on the upper surfaces of silver 
and sugar maple leaves. 
A few of the other eriophyids infesting trees and some of their hosts are as 
follows: Eriophyes fraxiniflora Felt feeds in the staminate flowers of ash. Infested 
clusters become deformed and remain on the tree as green masses until fall. The 
pearleaf blister mite, E. pyri (Pagenstecher), an introduced pest of pear and apple, 
also has been recorded on mountain-ash and serviceberry. It is sometimes abundant 
enough on mountain-ash to cause noticeable injury. E. parapopuli (Keifer) stunts 
the growth of poplar by producing woody galls around the buds. FE. caulis Cook 
causes large, deforming, hairy growths on the petioles of black walnut leaves. 
Bil 
