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Revision of the Aphelininea of North America: A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint): A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint)

Revision of the Aphelininea of North America: A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint): A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint)

          
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Excerpt from Revision of the Aphelininea of North America: A Subfamily of Hymenopterous Parasites of the Family Chalcididae

Economically, the Aphelininae are by far the most important of the parasites of the Diaspinae. Other scale insects are more abundantly parasitized by species of other groups, notably the Encyrtinae, but with the Diaspinae it is really difficult to find an affected tree which does not bear scales pierced by the exit holes of some aphelinine. It was with a species of the genus Aphelinus that lebaron made the first attempt at the transportation of a scale parasite from one region to another in which the parasite was supposed not to occur. As a matter of fact, however, while the numbers of the Diaspinae are undoubtedly frequently reduced to a considerable extent by the work of the mem bers of this subfamily, I have never seen a plant affected by scale insects in which the Coccidae were even approximately exterminated by these insects. The claims which were at one time made in Cali fornia of the extraordinarily beneficial work of Aspidiotiphagus citrinus upon Aspid'iotus uumutii have always seemed to me unjustified, and in this opinion I am supported by the evidence of Mr. D. W. Coquillett, who states that upon personal examination of the orchard in which it was claimed that this parasite had nearly exterminated the scale he found that but a small proportion of the dead scale insects contained the issuing holes of the parasites. The great majority of them seemed to have been killed by some disease.

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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.


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Product Details
  • ISBN-13: 9780260621924
  • Publisher: Forgotten Books
  • Publisher Imprint: Forgotten Books
  • Language: English
  • ISBN-10: 0260621927
  • Publisher Date: 12 Nov 2018
  • Binding: Hardback
  • Returnable: N


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Revision of the Aphelininea of North America: A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint): A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint)
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Revision of the Aphelininea of North America: A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint): A Subfamily of Hymenopterous Parasites of the Family Chalcididae (Classic Reprint)

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