I dag får du fri fragt

Du er her:
Bog, hæftet The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control (Classic Reprint) af W. F. Fiske

The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control (Classic Reprint)

(Bog, hæftet)

Kunder (0 anmeldelser)

Excerpt from The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control

Within a territory centering a little to the northward of Boston, it may be conservatively stated that fully 50 per cent of eggs, caterpillars, or pupæ of the gipsy moth, in the aggregate, were... Læs mere

Excerpt from The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control

Within a territory centering a little to the northward of ... Læs mere

Produktdetaljer:

Sprog:
Engelsk
ISBN-13:
9781331971061
Sideantal:
28
Udgivet:
01-09-2015
Vis mere

Sæt bog på liste

  • Bogliste

Leveringstid
5-8 hverdage
Forventet levering
05-03-2018

kr. 159,95
Fragt
Gratis

kr. 129,95
Fri fragt

Prisen er gældende for medlemmer af Saxo Premium. Prøv de første 14 dage gratis. (Herefter 99,-/md.)
Læs mere om vores forskellige typer medlemskab
her

Til dig, der elsker bøger

Læs mere om medlemskab
Op til 70% rabat Fri fragt
Udvidet returret Ingen binding
Fri streaming af 30.000+ e- og lydbøger


Forlagets beskrivelse
Excerpt from The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control

Within a territory centering a little to the northward of Boston, it may be conservatively stated that fully 50 per cent of eggs, caterpillars, or pupæ of the gipsy moth, in the aggregate, were destroyed by imported parasites in 1912. The territory over which the imported insect enemies have spread is not yet every extensive, but it is extending notably from year to year, and there is every reason to believe that the mortality to which the gipsy moth is already subjected in this central portion of the infested area will eventually be considerably increased throughout its whole extent. Some additional work will be done toward assisting in the dispersion of certain species, and it may be that a new attempt will be made to import under more satisfactory conditions certain others which appear not to have established themselves as the result of earlier attempts. Otherwise the work of parasite importation may be considered as completed.

The "Wilt" Disease Of The Gipsy Moth.

More than to the parasites, more than to the perfection of the methods of artificial suppression, the amelioration in conditions is due to the "wilt" disease. This is a malady similar to or suggestive of the flacherie of the silkworm. According to recent investigations it is due to parasitism by a bacterium which has been describe under the name of Gyrococcus flaccidifex by its discoverers, Messrs. Glaser and Chapman, working under the direction of Dr. W. M. Wheeler, of the Bussey Institution. While it is not positively proved that this bacterium is the cause of the disease, there are no good grounds for doubting and many for believing that it is. Confirmation is expected as the result of further cooperative investigations now under way by the Bureau of Entomology and the Bussey Institution.

Although we know very little of the bacterium, we known much of the malady. According to the most trustworthy observers it first appeared about 1903 or 1904 in certain of the worst infested forests, and by 1907, when the present writer first became associated with the gipsy-moth work, it was everywhere in evidence throughout the infested area. It seems slightly to increase in the years immediately following and to have reached a climax about 1911. At the present time, fortunately, there is nothing to indicate that it is at all likely to become much if any less effective in the immediate future.

We do not yet know how the caterpillars originally become infected, but once infected there is hardly room for doubting that the organism itself is conveyed from one generation to another through the egg. Simple infection is by no means sufficient to cause death.

About the Publisher

Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com

This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

Kundernes boganmeldelser af The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control (Classic Reprint)

Anmeld bogen og vær med i konkurrencen om gavekort – læs mere her.

Der er ingen anmeldelser af The Gipsy Moth as a Forest Insect: With Suggestions as to Its Control (Classic Reprint)

for at skrive en anmeldelse.

Bogens kategori:

Din personlige bogassistent

Han følger dig rundt og finder nye anbefalinger, baseret på de bøger du kigger på.

Skjul bogassistenten

Få løbende anbefalinger fra din personlige bogassistent, mens du kigger rundt her på siden.