 ... trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis.  Bulletin - Page 1821881Full view - About this book
 | 1875 - 766 pages
...trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis. The chrysalis contained in the cocoon is cylindrical, smooth, narrow, blackish-brown, about 16 millimeters... | |
 | 1877 - 512 pages
...trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis. The chrysalis contained in the cocoon is cylindrical, smooth, narrow, blackish-brown, about 16 millimeters... | |
 | 1877 - 508 pages
...trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis. The chrysalis contained in the cocoon is cylindrical, smooth, narrow, blackish-brown, about 16 millimeters... | |
 | 1878 - 932 pages
...trees, has proved fatal. In July, the worm spins a whitish, thin, papery cocoon in the mass of exuded pitch, which seems to act as a protection to both the larva and chrysalis. Thejwpa is cylindrical, smooth, narrow, blackish-brown, about 16 millimetres io length.... | |
 | Geological and Geographical Survey of the Territories (U.S.) - 1878 - 208 pages
...trees, has proved fatal. In July, the Worm spins a whitish, thin, papery cocoon in the mass of exuded pitch, which seems to act as a protection to both the larva and chrysalis. The pupa is cylindrical, smooth, narrow, blackish-brown, about 16 millimetres in length.... | |
 | United States Entomological Commission, Alpheus Spring Packard - 1890 - 1058 pages
...insertion of the branch. The worm in July spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both...branches ; and from the fact that the pitch of the trees protects the caterpillars no wash would injure the insect; hence extermination with the knife... | |
 | United States Entomological Commission - 1890 - 1078 pages
...insertion of the branch. The worm in July spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both...branches ; and from the fact that the pitch of the trees protects the caterpillars no wash would injure the insect; hence extermination with the knife... | |
 | 1915 - 870 pages
...Packard states * that "the worm in July spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis." This applies to the insect in the East. In the West the caterpillar of the pine pest restricts its... | |
 | Entomological Society of Ontario - 1877 - 572 pages
...has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitoh, which seems to act as a protection to both the larva and the chrysalis. The chrysalis contained in the cocoon is cylindrical, smooth, narrow, blackish-brown, about 16 millimetres... | |
 | Entomological Society of Ontario - 1872 - 492 pages
...trees, has proved fatal. In July the worm spins a whitish, thin, papery cocoon in the mass of exuding pitch, which seems to act as a protection to both the larva and the chrysalis. The chrysalis contained in the cocoon is cylindrical, smooth, narrow, blackish-brown, about 16 millimetres... | |
| |
