. 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. Insects injurious to the Willoios and Pines. 185 730. The WiUows have 99 species of insects feeding upon their wood and leaves, a very large number being gall-insects, plant-lice, and leaf-rollers. Of the remaining deciduous species, there is
. 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. Insects injurious to the Willoios and Pines. 185 730. The WiUows have 99 species of insects feeding upon their wood and leaves, a very large number being gall-insects, plant-lice, and leaf-rollers. Of the remaining deciduous species, there is no one but that has several insects upon its leaves, or other parts, and there is perhaps not one that wholly escapes alive when these are in excess. 731. We next come to consider the coniferous species, some of which suffer severely, especially when their leaves are attacked, because these do not put forth new leaves again, as do most of those enumerated, and when the leaves are stripped off, the tree must die. They can not sprout from the roots, and seldom put forth side branches to save life when severely injured. Taken as a whole, coniferous forests are much more liable to general ruin when attacked than others. 732. The Pines are liable to attack from about 110 species, of which about 62 belong to the 1st class, 16 to the 3d, 21 to the 5th, 8 to the 6th, and 2 to the 7th. Of the 1st class are many species of wood and bark-borers, that are generally more liable to attack old trees that have passed their liiii 115. Pine Weevil {Hylobm - 733. The pine weevil is a very destructive insect, breeding un- der the bark, but doing the greatest injury after it has come to the perfect form. It then attacks the young trees, generally those of from three to six years of age, eating out the terminal shoot, the buds and the young stems. It is not much inclined to fly, and in very hot weather, as also iu the cool of night, it conceals itself among the herbage and litter on the grou
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectforestsandforestry
