Un guide complet des pratiques forestières aux États-Unis, mettant l'accent sur la plantation et l'entretien des arbres forestiers à des fins ornementales et lucratives. Il comprend des suggestions pour la création de terres boisées et la gestion de la croissance forestière afin de maximiser les avantages à long terme.
1983 x 1260 px | 33,6 x 21,3 cm | 13,2 x 8,4 inches | 150dpi
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. The elements of forestry : designed to afford information concerning the planting and care of forest trees for ornament or profit and giving suggestions upon the creation and care of woodlands with the view of securing the greatest benefit for the longest time, particularly adapted to the wants and conditions of the United States. Forests and forestry. 186 Insects injurious to Pines and Spruces. 734. The white-pine weevil (Pwsodes s<ro6i), allied to the species here presented, does great damage to the young pines, by eating. 116. Plssodes notatus. (The rersth of the Insect is indicated liy the White Line in the lower left-hand Corner.) into the leading shoot. A method is practiced in Europe of de- stroying these and other insects of the pine, which consists in stick- ing some newly cut branches of the pine-trees in the ground, in some open place, at about the season when the insects are laying their eggs. In a few hours the branches will be cov- ered with beetles, v/hich may be shaken into a cloth and burned. This is, however, altogether impracticable in a forest, and the best check upon their increase is provided by nature in the ichneumon flies that deposit their eggs in their bodies, and thus finally destroy them. The accompanying engraving shows the eflfect of these injuries upon the young twigs of the pine. 735. The Spruces suffer very much in the same way as the pines, but the number of spe- cies noticed is only about a quarter as great. The most destructive are the bark and wood- 117. Effect of Ravages of boring beetles, which although generally at- the Hylesinus upon the ii-. ^. j. j.ijt Pine Twig. tacKing trees that are on the decline, appear at times nevertheless to bore into perfectly sound and healthy trees. The family of coleoptera known as Scohjtidce, v.-hich may be called. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations m
