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Excerpt from Experiments With Insecticides for the San Jose Scale
It was the principal object of these experiments to test the ef feets of rains on the two washes used, but other important results appeared in the outcome besides those immediately aimed at. Counts of dead and living scales on the check trees not treated and on the experimental trees before treatment, showed a surprising percentage of half-grown scales already dead, the ratio of dead young to living scales varying on different trees and on different parts of the same tree from twenty-one per cent. To sixty-nine per cent. This fact had already been observed in other localities where our insecticide work was in progress, and had, indeed, been noticed and reported as early as 1898 by another assistant of the office, Mr. E. B. Forbes, engaged in distributing to infested trees in southern Illinois the spores of a fungus parasite of the San Jose scale.
This Spontaneous death of many of the scales which might have been expected to pass the winter alive, was apparently due in great measure and in both instances to a severe drouth of the pre ceding year. Consistently with this explanation the dead scales were most abundant on trees worst affected by the drouth, and on parts of trees to which the flow of sap would naturally be least.
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Experiments With Insecticides for the San Jose Scale (Classic Reprint)
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Paperback. Condizione: New. Print on Demand. An essential guide to the history, methods, and practical application of insecticides and treatments to control the San Jose scale, a pernicious pest that devastates fruit trees. The author, a respected entomologist, provides a comprehensive overview of proven techniques and their development. This book thoroughly explains the effectiveness of lime, sulfur, and salt washes, as well as lime, sulfur, and blue vitriol washes, in controlling scale infestations. Through meticulous experiments, the author demonstrates the impact of rainfall and water applications on the efficacy of these treatments and provides valuable insights into their practical application. The findings presented in this book are crucial for understanding and combating the San Jose scale, making it an indispensable resource for entomologists, farmers, and anyone seeking to protect fruit trees from this destructive pest. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book. print-on-demand item. Codice articolo 9781334184550_0
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Experiments with Insecticides for the San Jose Scale (Classic Reprint)
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Experiments with Insecticides for the San Jose Scale (Classic Reprint)
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PAP. Condizione: New. New Book. Shipped from UK. Established seller since 2000. Codice articolo LW-9781334184550
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