Excerpt from The Grapecane Gall-Maker and the Grapecane Girdler Both insects vary greatly as to their abundance in difierent seasons. For a year or two the characteristic marks of one or both species will be very conspicuous on the vines, and then 'for a period of a few years following they may be almost entirely absent. This irregularity in their occurrence is due largely to the fact that when the beetles increase in numbers there follows a corresponding increase in the numbers of their natural ene mies. These enemies, ...
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Excerpt from The Grapecane Gall-Maker and the Grapecane Girdler Both insects vary greatly as to their abundance in difierent seasons. For a year or two the characteristic marks of one or both species will be very conspicuous on the vines, and then 'for a period of a few years following they may be almost entirely absent. This irregularity in their occurrence is due largely to the fact that when the beetles increase in numbers there follows a corresponding increase in the numbers of their natural ene mies. These enemies, which are chiefly parasitic insects, attack the beetles in their immature stages and sometimes reduce them almost to the point of extermination. When there comes a de crease in the parasites the beetles begin to multiply, but since the females of neither Species produce many eggs it takes them some time to recover from the set-back. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at ... 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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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.
Choose your shipping method in Checkout. Costs may vary based on destination.
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.
