This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...BARK BEETLE DESTROYER (CLERUS FORMICARIUS), TO AMERICA." "it nas certainly been very plainly seen in Nature that in her damain equilibrium should be retained. She has therefore placed a limit to the excess of individual animals, in which she causes their enemies to associate. Besides birds, insects have very many other ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...BARK BEETLE DESTROYER (CLERUS FORMICARIUS), TO AMERICA." "it nas certainly been very plainly seen in Nature that in her damain equilibrium should be retained. She has therefore placed a limit to the excess of individual animals, in which she causes their enemies to associate. Besides birds, insects have very many other destroyers, especially among themselves. There is a large number of predaceous insects in all the orders, which like highway robbers, attack other individuals. On account of the particular taste of the enemy they seize only certain kinds of food. Therefore, wherever nourishment occurs for insects their enemies are also associated with them, and finally malicious sneakers, the internal parasites, which are found in great abundance in the Hymenoptera and Diptera, prey upon their hosts. In July of this year Mr. Andrew D. Hopkins, of the W. Va. Agr. Exp't Station at Morgantown, communicated to the readers of Science, Vol. XX,1 how in late years the bark beetle, Dendroctontts-frontalis, Zimm, has appeared in such vast numbers in West Virginia that upon a territory of 10,000 sq. miles 75% of all pine trees have been either injured or killed outright. Therefore. Mr Hopkins has conceived the idea, that after he had observed how Clerus dubius, P. gave troubie to the Scolytids by thinning their ranks, to place with it Clerus formicarius, L. to help in its good work in order, at least, to do what is possible to overcome the enemy of the forest. Europe and North America have had for a long time an active commerce between both sections of country and through the similarity of climate there has been a reciprocal exchange of injurious insects. Iam reminded of the introduction of the potato beetle (Leptinotarsa decimlineata, Say) into Germany, and ...
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Seller's Description:
PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.