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Collected Papers Volume 2

Collected Papers Volume 2


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About the Book

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ... touch the trunks of all the surrounding trees, as shown in Fig. 2 and Plate VII, as the trees were set 16 by 16 feet, the 1--l Q Fio. 2.--Diasram Of Arransement Of Sheet Anu Pans In Securino Estimates. Broken line represents first arrangement of sheet. Solid line surrounding single tree represents the arrangement of sheet most.ommonly used. canvas exposed was 32 feet square. This arrangement was believed to compensate for any air movement. This method, while theoretically sound, caught so many psylla that the labor of counting was so great that only a few trees could be used for counts. During 1922 the procedure was modified so that the canvas extended a short distance beyond the periphery of the crown except at the corners, as shown in Fig. 2. The sheet described a rectangle whose dimensions were the two diameters of the tree. It will be noted from Fig. 2 that in the Coates orchard, in 1921, the equivalent of four entire trees contributed to the collection on the sheet. Inasmuch as from 58,000 to 85,000 adults were caught on each sheet (Plate VII), it was practically impossible to count every insect, so an estimate was made by counting every adult on three strips each slightly more than 2 feet wide, the entire length of the sheet. Adding the numbers from each strip and dividing by three gave the average number of adults per strip. Then multiplying by 15 (the number of strips) furnished the estimated number of adults on the sheet. Dividing the product by four, the number of trees contributing, gave the estimated number of adults brought down from a single tree. The reader will observe that no estimate was made of the number of nymphs killed on the same tree. This could not be determined practically, because few of the dead nymphs...


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Product Details
  • ISBN-13: 9781230027685
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1230027688
  • Publisher Date: 13 Sep 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr

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