Entomology Bulletin - New Series Volume 6-14

Entomology Bulletin - New Series Volume 6-14

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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. 1896 edition. Excerpt: ...valueless by this species. Melanoplus bivittatus was scarcely less numerous than dijfferentialis in some places, but this does not contradict the above statement that threefourths of the damage was done by the latter species. D. hngipennis was occasionally met with. Hippiseus corallipes Hahl. was not found. The Arkansas Valley has been exempt from much injury for several seasons, but it is favorable weather conditions and the absence of parasites that have brought about the present state of affairs. The pests are increasing, and although they will not be much in evidence next year on account of the very natural increase of parasites, the trouble will not at least be augmented. Unfavorable weather conditions, such as freezing or a late or wet spring, may, however, noticeably diminish the number of locusts here. The preponderance of evidence points to the fact that the trouble is a permanent one, in spite of the aid given by parasites and meteorological conditions, or, at any rate, of frequent periodical occurrence, and that the work of the farmers and not the intervention of Providence is the only way out of the difficulty. Destruction is made easy by the fact that the locusts are collected in small areas, as has been indicated in the discussion of the situation in Nebraska. The parasites may be abundant one season in one of these areas, or may even practically exterminate the locusts infesting it, but do not easily spread to the neighboring fields, which may be 3 or 4 miles distant. Thereupon the locusts begin to increase again in this area, and this process is repeated continuously. The ready means of control of the pests by the farmers and the reasons why it is possible will be brought out more fully in the discussion of the conditions in...
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Product details

  • Paperback | 318 pages
  • 189 x 246 x 17mm | 572g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236590201
  • 9781236590206