Bulletin of the U.S. Department of Agriculture Volume 835-851

Bulletin of the U.S. Department of Agriculture Volume 835-851

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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. 1920 edition. Excerpt: ...limitation to a single food plant, while the potato-feeding insect infests virtually all of the Solanaceae, including the weeds, and is capable of breeding continuously on all species of Solanum and probably on other genera. There is no reason to suppose that this insect may not by flight increase its present range materially some time, although not necessarily in the near future. Its further dissemination, however, would doubtless be slow and never as rapid as in the case of the comparatively fleet-winged and more adaptable Colorado potato beetle. The reasons, then, for its failure to have become more widely distributed are: Its limitation to a single food plant and its probable incapacity for protracted flight with the wind. Moreover, it is probably not capable of inhabiting such varied climates as is the Colorado potato beetle, a species which seems to have no respect for life zones but which thrives equally well from subtropical southern Texas to boreal Manitoba. In the case of the Colorado potato beetle it can not as yet be definitely stated, as some authors have assumed, that it breeds wherever potatoes are grown, but it is perfectly capable of doing so, and it may be that in the course of time, many years undoubtedly, the bean ladybird will be distributed wherever its food plant is cultivated.1 Another factor which strengthens the belief that the bean ladybird will, in the course of time, become more widely disseminated is its very close relationship, both structurally and biologically, to the squash ladybird (Ejrilachna borealis Fab.), which ranges from South America northward through Central America, Mexico, and the Antilles, along the Mexican and Atlantic seaboard States to Maine and Canada. Obviously the squash-feeding species...show more

Product details

  • Paperback | 204 pages
  • 189 x 246 x 11mm | 372g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236913833
  • 9781236913838