Manual of Forestry for the Northeastern United States

Manual of Forestry for the Northeastern United States

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1918 edition. Excerpt: ... transform into brown chrysalids inside the loosely made shelters. In six to ten days the small brown moth emerges from the chrysalis, dragging the empty case partially out of the larval shelter. The moths are found from the middle of une to the end of uly. Shortly after emergence, they deposit their peculiar pale-green scale-like eggs in small oval patches on the undersides of the needles, and they are not conspicuous. The eggs hatch in about a week or ten days, and the young larva: feed for a short time on the terminal shoots of the branches before hibernating. During uly when the moths are flying, they occur in enormous numbers about the electric and other lights.... They are carried considerable distances by the wind, and this method of dispersal accounts for the rapid spread of the insect." Treatment.----N o practicable method of directly combating the spruce budworm is as yet known. Its greatest damage is done in connection with the spruce bark-destroying beetle This beetle can be controlled as already described. Where the spruce budworm is found in abundance, especial watch should be kept to see whether the bark-destroying beetle has attacked the weakened trees. THE GIPSY MoTH (Porthetria dispar). Form of Damage. W Since its importation into Massachusetts, the damage done by this insect has been most serious damage, by the way, not confined either to forest or fruit trees, for it also attacks other forms of vegetation. The damage done is by defoliation which weakens the tree, and if repeated for two or three successive seasons results in its death. The gipsy moth prefers such trees as the oak and maple, but conifers are not immune.' It does little damage to the compound leaf species, as the ash, hickory and butternut....
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Product details

  • Paperback | 66 pages
  • 189 x 246 x 4mm | 136g
  • United States
  • English
  • black & white illustrations
  • 1236877217
  • 9781236877215