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Congressional Edition Volume 5481 (Paperback) Loot Price: R908 Discovery Miles 9 080
Congressional Edition Volume 5481 (Paperback):
Congressional Edition Volume 5481 (Paperback):

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Congressional Edition Volume 5481 (Paperback)

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Loot Price R908 Discovery Miles 9 080

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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. 1909 Excerpt: ...beneficial action of useful insects.0 CONCLUSION. That birds do little or no harm by eating insects indiscriminately may perhaps be better shown by an illustration. Let us suppose that half of all of the individuals of every species of insect in the world were suddenly destroyed; haif of the cotton boll weevils, half of the Colorado potato beetles, half of the chinch bugs, half of the codling moths, half of the innumerable host of other pests to the farmer and fruit raiser, and also half of the vast multitude of predatory and parasitic species swept away at one fell swoop. Is there any farmer or horticulturist who would not welcome such destruction? Would it not be a blessing to vegetation as far as cultivated crops are concerned? Many insects that are now troublesome would by this reduction be rendered comparatively innocuous, while in other cases the farmer would be able to cope successfully with the remainder. Now, this reduction would leave entirely undisturbed the internal relations of the insects themselves. The predatory beetles remaining would have proportionally just as many scales or larvae to feed upon as before. The parasitic Hymenoptera would have just as many hosts to infest and the scales and larvae would have just as many enemies to prey upon them. That a great increase of vegetation would take place is probable, but this would very soon be counterbalanced by the unusual supply of food offered to rodents and other herbivorous mammals, and in fact in a short time the insects themselves would, through the increased facilities for multiplication, resume their normal numbers unless there arose some other factor to hold them in check, such, for instance, as a great increase in the number of birds. In closing the writer can not do better than...


Imprint: Not Avail
Country of origin: United States
Release date: May 2012
First published: May 2012
Dimensions: 246 x 189 x 17mm (L x W x T)
Format: Paperback - Trade
Pages: 322
ISBN-13: 978-1-236-20243-7
Barcode: 9781236202437
Categories: Books
LSN: 1-236-20243-0

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