Middleton, W. 1931 The susceptibility of shade trees to insects.. National Shade Tree Conference 46-56.

Notes: Among the common insect pests listed are pine leaf scale, euonymus scale, cottony maple scale, tulip tree soft scale, magnolia soft scale, juniper scale, European elm scale, gloomy scale, San Jose scale, maple phenacoccus, European fruit scale, Eriosoma sp., elm scurfy scale, golden oak scale, Chionaspis spp., obscure scale, Aulacaspis pentagona and A. rosae.