Report on Investigations to Determine the Cause of Unhealthy Conditions of the Spruce and Pine from 1880-1893 Volume 50-56

by Andrew Delmar Hopkins

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 ...America on September 25, with over one thousand live specimens of Clerus formicarius, which was found to be especially destructive to various bark beetles in all of the forests visited. The following extracts, translated from an article in German published in "Science"1 in November, 1892, by Director Oamil lo F. Schaufuss of Meissen, Saxony, will give some additional "ON THE INTRODUCTION OF THE EUROPEAN BARK BEETLE DESTROYER (CLERUS FORMICARIUS), TO AMERICA." "it, has certainly been very plainly seen in Nature that in her demain 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. Ya. Agr. Exp't Station at Morgantown, communicated to the readers of Science, Vol. XX, ' how in late years the bark beetle, Dendroctonus 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, F. gave troubie to the Scolytids by thinning their ranks, to place with ...

82 pages, Paperback

Published January 1, 2012