Download PDF, EPUB, MOBI Economic Entomology Volume 138; Pamphlets

Download PDF, EPUB, MOBI Economic Entomology Volume 138; Pamphlets

Economic Entomology Volume 138; Pamphlets.cBooks Group

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Author: Books Group
Page Count: 306 pages
Published Date: 06 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781130714883
File Name: Economic.Entomology.Volume.138;.Pamphlets.pdf
Download Link: Economic Entomology Volume 138; Pamphlets
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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. 1920 Excerpt: ... The main reason for the change in opinion is because of the cost of such work and uncertainty as to results. The temperature can be raised in this manner but it often happens that when one has spent considerable time and money in smudging against a looked-for frost the temperature does not fall below the danger line. This makes smudging of very doubtful utility, even though it is sometimes the means of saving a valuable crop. Wood and coal are not satisfactory materials for smudging as they require too much labor and respond too slowly when it is desired to raise the temperature quickly. Crude petroleum, burned in suitable heaters, will raise the temperature quickly and hold it for a considerable time, but one cannot be sure that a frost will occur even though it is predicted by the officials of the weather bureau. Just when to begin lighting the heaters can be determined only approximately even though a constant watch is kept through the night. Heating in winter to protect fruit buds is even less practicable than heating to protect blossoms in spray time. Mulched strawberry beds may be set on fire unless a considerable space around each fire pot is left uncovered. There is danger, also, of setting fire to grass and straw with heaters in mulched orchards. While it is true that there are considerable losses by burning oil in orchards when not needed it may be due, in some cases, to over zealous orchardists who are anxious to try something new. The fact should not be overlooked, however, that orchard heating is an expensive operation even when no unnecessary work is done. EXPERIMENT STATION The publications of this Station are now issued in three series, namely: 1. The Monograph Bulletin, each number of which is a record of progress in a single line of inves...

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