File:Fumigation investigations in California (1909) (14778935991).jpg

Identifier: fumigationinvest79wogl (find matches)
Title: Fumigation investigations in California
Year: 1909 (1900s)
Authors: Woglum, R. S. (Russell Sage), 1882-
Subjects: Citrus Fumigation
Publisher: Washington, D.C. : U.S. Dept. of Agriculture, Bureau of Entomology
Contributing Library: U.S. Department of Agriculture, National Agricultural Library
Digitizing Sponsor: U.S. Department of Agriculture, National Agricultural Library

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tatements by experts on fumigation as to tin4 amount ofinjury resulting from work while the trees are in blossom are veryconflicting. Some fumigators hold that a very light dosage willdestroy the tender blossoms, while others believe that the blossomswill stand a heavy dosage. In order to decide this point much experi-mentation was carried on and many observations made throughout77488—Bui. 7«i—<»!» 1 50 FUMIGATION INVESTIGATIONS IN CALIFORNIA. the blossoming period of 1908. Some of the results secured aregiven in the following paragraphs. Experiment No. 1.—On February 28 and 29 about one-third of anacre of mixed Valencia and Navel orange trees was fumigated atUpland, Cal., using dosage rates of 1 ounce and 11 ounces per 100cubic feet. The trees were about 12 feet in height. At this timethe blossoms were just appearing on the trees, none of them beingfar enough advanced to open. The general conditions of the blos-soming may be understood by an examination of figure 14. This
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Fig. 14.—Orange blossoms at an early stage of development. (Original.) may be considered the tenderest stage of blossoming. An examina-tion of these trees two weeks later showed that no apparent injuryhad resulted and that the trees at this tune contained as heavy aset of blossoms as the surrounding unfumigated trees. Experiment No. 2.—On March 30 fully 1 acre of Navel and Valenciaorange trees about 10 feet high were fumigated at Orange, Cal.. usingdosage rates of 1, 1 ), and 2 ounces per 100 cubic feet. The condii ionof blossoming at the time of fumigation ranged from no open blos-soms on some trees to full blossoms on others. An examination ofthese trees at a later date showed that with the 1 and \\ dosagelaics no apparent injury had been done. The 2-ounce rate had caused 1 T.\; l(i \ I (ON N\ I I II.I I I: I 1 I l> >.M \i.l.. 5 1 b considerable percentage of the blossoms to drop, ye\ not enoughto lessen the coming crop of fruit to any great extent. if at all. Experiment N

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