Word: barking
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
...ZOOLOGICAL CLUB. "The Introduction of a European Bark-beetle, Scolytus Multistriatus, into Massachusetts." Mr. J. W. Chapman. Zoological Laboratory, 4th floor, Room...
...leopard moth, which was first noticed in June 1909 is an imported European pest, and is only injurious in its larval stage. The life of the larva is two years. It makes its way into the tree by boring through the bark where it may make great furrows in the growing layer, thus girding the limbs, or it may burrow deeper into the heart of the tree. Its burrows show that it migrates often, from one part of a branch to another or to a different one altogether...
While cutting the leopard moth larvae from the limbs of the elms last fall, a small beetle was found, which has since been identified as the European elm bark-borer--scolytus multistriatus-marsh. In Germany it is known as the "splint kafer" and it is one of their most injurious pests. It enters the bark and the newly hatched larvae work in the splint of the live wood causing the bark to loosen and eventually fall off. Scores of trees in the Yard and about Cambridge have been examined and without exception all of them are infected...
Insecticides fail to reach either the leopard moth or bark-borer. And such a spraying as the trees got when attacked by the elm-leaf beetle may have something to do with the apparent absence of insect enemies of the two above-named species. For the spraying of the trees could have easily killed their parasites, which might have been lurking about on the trees at the time the spray- ing was done. And one thing that favors this theory is,--the leopard moth is worst in that part of the Yard which was the most carefully sprayed...
...into the larger limbs. These worms vary in size from three-eighths of an inch to over three inches in length, when they are the most destructive. They then bore across and completely girdle large limbs, and frequently even girdle the trunk, finally cutting a cell close to the bark and there turning into pupas. When these develop they push out through the bark and become moths, which in turn lay their eggs in the bark of the twigs. The elm beetle works in a similar manner, through it does not cut across the wood, but burrows mostly...