Fiorinia externa ferris, a scale insect of hemlock
Talerico, R.L., McComb, C.W., Garrett, W.T.
Fiorinia externa ferris, a scale insect of hemlock - Washington 1971 - 1-5 p. - Insect United States Department of Agriculture, Forest Service. Forest Pest Leaflet No. 107 .
Fiorinia externa ferris, a scale insect of hemlock - Washington 1971 - 1-5 p. - Insect United States Department of Agriculture, Forest Service. Forest Pest Leaflet No. 107 .