Apple (Pyrus mains Linn.). 
Apple, Chinese flowering (Pyrus specta 
Lit.). 
Apple, crab i Pyrus sp.). 
\-l* European mountain (Sorbus 
pwria Linn 
Ash, mountain (Sorbus americana Ail 
Ash, prickly (Xanthoxylon americanum 
Mill 
Ash, while i Fraxinus americana Linn.). 
Aspen, largetooth (Populus grandia 
Michx.). 
Buckthorn (Rhamnus cathartica Linn. 
Cherry, choke (Prunus virginiana Linn.). 
Cherry, wild black [Prunus serotina 
Ehrh 
Cherry, wild red <l'mn>is pennsylvanica 
Linn.). 
Chokeberrj (Pyrus Jloribunda Lindl.). 
Elm ( Ulmus sp.). 
Goo i ben \ i Ribes sp 
Hawthorn (( ratxgus oxyacantha Linn.). 
Hickory, big bud i Hieoria alba Britl 
Hoi e chestnul (JSsculus hippo 
Linn i. 
Peach il'niniiH persica Sieb. *V Zucc 
Pea] ■ a in, lis Linn i, (P. ft< /</•<<- 
phijlla Pur. ). 
Plum ( /'mints pissardii Horl 
Plum, common garden (Prunus domeslica 
Linn. ). 
Quince (Cydonia vulgaris Per 
Quince, Jap sPei 
Raspberry, black cap I Halms occidentalis 
Pei 
Red iv. igged do wood (doubtful r< 
Shad-bush I canadensis Me 
die). 
Chokeberry, black (Sor&us melanocarpa Sweet gum (Liquidambar p 
C. Koch Sweet pepper bush (Clethra alni/olia 
Chokeberry, red (5orfeiM arbulifolia C. Linn 
Koch) Walnut, black (Juglans nigra Linn.). 
"Cherrj currant." Willow, white (Salix alba Linn.). 
Currant, red flowered (Ribes sanguineum 
Pursh. i. England. 
Tin scurfy scale is especially common on apple and pear, less usu- 
ally so on cherry and peach, on winch latter hosi in the South, in cer- 
tain cases which have come under the writers' obsen ations, it proved 
\ei'\ destructive, greatrj stunting the trees, although none had actu- 
ally been killed. 
PARASITIC VST) PREDACEOUS ENEMIES. 
This species is apparently not so subject to attack of parasitic and 
predaceous insects as the preceding, or else attention has not been 
directed to this phase of the insect's economy to an equal extent. 
The following predaceous species are recorded as feeding upon the 
scurfy scale: Tyroglyphus malus (Shimer), Chilocorus bivulnerus Muls., 
and Hypi raspidis sp. 
^mong the parasitic Hymenoptera, Ablerus clisiocampa. (Ashm.) 
has keen reared from this species, as well as Physcus varicornis I low.. 
and a species of the genus ProspalU lla. 
METHODS OF CONTROL FOR BOTH SPECIES. 
Preparatory to spraying orchard, shade, and ornamental trees and 
plants for scale insects, they should be carefully gone over and any 
dead and weakened parts primed out. The presence of such dead 
and dying wood is a distinct detriment, and its removal will greatlj 
simplify t he work of spraying. 
[Clr. 121 I 
