[fletchkk] injurious INSECTS OF CANAD.i 227 



qiiently the case in the "West, these trees have been grown for orna- 

 mental purposes, the disfigurement is of considerable importance. The 

 injury to the timber is also great, and many trees after being defoliated 

 for two or three years running are destroyed. 



The Negundo Plant-louse (Chaitophorus negundinis, Thomas). — One 

 of the worst pests of shade trees in Manitoba and the Northwest Terri- 

 tories, is this native plant-louse, which renders the trees, and everything 

 around them, filthy, by reason of the copious deposits of honey dew 

 which it emits. Trees have been cleared of this pest by spraying 

 them with the ordinary washes of kerosene emulsion and whale-oil soap 

 which are used 'against other plant-lice. (Rep. Exp. Farms, 1893, 

 p. 184.) 



The Maple Shield-maker {Incurvaria acerifoliella, Fitch). — Occa- 

 sionally the leaves of the sugar maple, particularly when growing in 

 forests or groves, are damaged by the caterpillars of a small moth, which 

 cut out circular disks, over a quarter of an inch in diameter, and make 

 curious little flat cases of them, inside which they live while they are 

 devouring the foliage and inside which also they pass the winter among 

 the fallen leaves. (Eep. Hon. Ent. Dept. Agr. Can., 1885, p. 31.) 



The Striped Cottonwood Beetle {Lina scripfa, Fab.). — Poplars 

 and willows in the prairie provinces are frequently disfigured and much 

 injured by the fetid larvte of this beetle, which eat away the green por- 

 tions of the foliage, leaving only the browned skeletons of the leaves. 



The Pallid Aspen Beetle {Goniodena pallida, L.).— Throughout 

 ]\ranitoba and the Northwest Territories during the past two years, the 

 groves of aspen poplars, which are of so much importance in that 

 country, have been devastated by the larvae of this insect, which in 

 every way closely resemble those of the last. Plantations have been 

 protected by spraying them as soon as the beetles appear in spring, with 

 a Paris green wash. 



The Ten-striped June Beetle (Polyphylla decemlineata, Say). — The 

 grubs of this handsome western beetle do much harm to the roots of 

 many shrubs and young trees in nurseries, as well as to the roots of al- 

 . most every plant grown in gardens on Vancouver Island. (Eep. Hon. 

 Ent. Dept. Agric. Can., 1885, p. 15.) These larvae are very similar in 

 appearance to, but are larger than the well known white grubs of the 

 east. 



