THE SAN JOSE SCALE AND ITS CONTROL. 9 
The suggestion that the insect may be disseminated by means of 
scale-infested fruit (see fig. 7) has been frequently made, but it is 
the consensus of opinion among American entomologists that this 
danger is negligible. 
FOOD PLANTS. 
The San Jose scale infests practically all deciduous fruit trees, such 
as apple, pear, peach, plum, etc., and also many ornamental and 
shade trees. It is, however, seriously destructive to a much smaller 
number than that upon which it may actually maintain its existence. 
The following list of food plants, as compiled by Dr. W. E. Britton,* 
includes those that are commonly or badly infested: 
Acacia sp. Lintner, Felt, N. Y.; Alwood, Va. 
Akebia sp. Felt, N. Y. 
Akebia quinata Decaisne. Alwood, Va. 
Shad-bush (Amelanchier canadensis Medic.), Juneberry, and other species. Britton, 
Koehler, Conn.; Alwood, Va. 
Citrus trifoliata Linn. Scott, Ga.; Alwood, Va.; Gossard, Fla. 
Cornus alba Linn. var. sibirica Lodd. Britton, Conn. 
Cornus baileyi Coult. & Evans. Gould (in N. Y.). 
Cornus sanguinea Linn. Britton, Conn. 
Cotoneaster sp.? Britton, Conn.; Lintner, Felt, N. Y.; Card, R. I. 
Cotoneaster vulgaris Lindl. Alwood, Va. 
Hawthorn (Cratezgus sp.). Britton, Conn.; Lintner, Felt, N. Y.; Alwood, Va.; 
Smith, N. J. , 
Cratzegus cordata Soland. Koehler, Conn. 
English hawthorn (Crategus oxryacantha Linn.). Britton, Koehler, Conn. 
Crategus coccinea Linn. Koehler, Conn. 
Crategus crus-galli Linn. Koehler, Conn. 
Common quince (Cydonia vulgaris Pers.). Britton, Conn.; Lintner, N. Y.; Alwood, 
Va. 
Japanese or flowering quince (Cydonia japonica Pers.). Britton, Koehler, Conn.; 
Lintner, N. Y.; Alwood, Va.; Johnson, Md. 
European purple-leaved beech ( Fagus sylvatica Linn. var. purpurea Ait.). Smith, N. J. 
Japanese walnut (Juglans sieboldiana Maxim). Britton, Conn.; Alwood, Va.; Sher- 
man, N. C.; Smith, N. J. 
Common privet (Ligustrum vulgare Linn.). Alwood, Va. 
Poplar (Populus sp.). Britton, Conn.; Smith, N. J.; Sanderson, Del.; Felt, N. Y. 
Carolina poplar (Populus deltoides Marsh). Britton, Conn.; Rolis & Quaintance, 
Fla.; Alwood, Va. 
Lombardy poplar (Populus nigra Linn. var. italica Du Roi). Britton, Koehler, Conn.; 
Rolfs & Quaintance, Fla.; Alwood, Va. 
Almond (Prunus amygdalus Stokes). Lintner, N. Y.; Alwood, Va. 
Apricot (Prunus armeniaca Linn.). Lintner, Felt, N. Y.; Alwood, Va.; Smith, N. J. 
Sweet cherry (Prunus avium Linn.). Britton, Conn.; Lintner, Felt, N. Y.; Alwood, 
Va.; Smith, N. J.; Cockerell, N. Mex. 
Prunus pumila Linn. Koehler, Conn. 
Sand cherry (Prunus pumila var. besseyi Waugh). Alwood, Va. 
Purple-leaved plum (Prunus cerasifera Ehrh. var. atropurpurea Dipp. (P. pissardi). 
Britton, Conn.; Felt, N. Y. 
1 Britton, W. E. List of hardy trees, shrubs, and vines commonly or badly infested [by the San Jose 
scale]. Conn. Agr. Expt. Sta., Rpt. for 1902, pt. Il., 2d Rpt. State Entomologist, p. 132-138. 1903. 
80074°—Bull. 650—15——2 
