Bulletin Volume 148-166

Bulletin Volume 148-166

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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. 1914 edition. Excerpt: ...applied overlying epidermis. As pointed out once before, these blotches, with the exception of a few, dp not retain their blotch-like appearance. Reacting to the injury, the leaf tissue at that point is stimulated to new growth, and, growing outwardly, away from tbe center, gradually undergrows the elastic epidermal area or blotch and raises it above its normal level, forming a wart-like tubercle or papilla with a single perforation at a point in its periphery. (Plate II., Fig. 9.) On the other host plants under observation in the insectary these papilhe formed less readily and less perfectly. Feeding is done to a greater extent from the upper surface of the leaf. Do the males feed upon the juices of the leaf tissue of the host plants as do the females?, Lacking tbe ovipositor with which tbe females are provided, tbe males are of course unable to pierce the epidermis of the leaf. In order, therefore, to feed upon the juices of the leaf tissue they must resort to the punctures made by the females. This, it should be said, the writer has not observed them doing. Experimental evidence, however, as will be seen below, though somewhat contradictory, would seem to indicate that they do. Thus males live longer when confined with females upon leaves on plants which are pierced by the females for feeding purposes than when isolated by themselves, under the same conditions, on leaves which remain entire on account of tbe inability of the males to pierce them. The length of life of a large number of males isolated by themselves on leaves within cheesecloth bags was from two to five days, although a single individual lived seven days. On the other hand, males confined with females urder the same conditions lived from four to thirty days, the greater...show more

Product details

  • Paperback | 224 pages
  • 189 x 246 x 12mm | 408g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236743210
  • 9781236743213