Department Bulletin Volume 601-625 by United States Department of Agriculture
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Author: United States Department of Agriculture
Number of Pages: 332 pages
Published Date: 14 May 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: English
ISBN: 9781235299766
Download Link: Department Bulletin Volume 601-625
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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: ...citrus trees. The citrus thrips is known to ocSacramento, cur in eight counties in California (see fig. 1), viz Fresno, Tulare, Kern, Los Angeles, San Bernardino, Riverside, and Orange. The infestation is most serious in Tulare, Fresno, Riverside, and San Bernardino Counties. In Kern County the insect is increasing rapidly and with increased plantings of citrus doubtless will become quite as injurious as in Tulare County. Although the insect occurs in injurious numbers in Arizona, thus far it has been taken only in the Salt River Valley near Phoenix and Mesa (fig. 2). Dr. A. W. Morrill informed the writer by letter that he thought he detected traces of thrips injury in an orange grove near Yuma, but specimens have not been taken there. POSSIBILITY OF ITS OCCURRENCE ELSEWHERE. No verified reports of the occurrence of the citrus thrips in States or countries other than the foregoing have been made, although it is said to occur at Hermosillo, Sonora, Mexico. There are various reports of thrips injuring citrus fruits, the species concerned being often in doubt. Thus, Tower1 states that certain scars found on oranges in Porto Rico probably are caused by thrips which were present in the trees in great numbers, but the identity of the thrips is not given. Rolfs, Fawcett, and Floyd-describe injury to oranges in Florida by a thrips which appears to be Frankliniella (Euthrips) tritici Fitch, if indeed the injury illustrated by them is caused by thrips. The citrus thrips does not occur in southern Louisiana, and doubtless could not thrive there because of the high humidity and heavy rainfall, and for the same reason probably does not occur in Florida. NATURE AND EXTENT OF INJURY. Fig. 2.--Map showing present-known distribution of the citrus thrips In Arizona. (Origina...
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