Bulletin Volume 150-166

Bulletin Volume 150-166

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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. 1904 edition. Excerpt: ...birds and insects with long bills or probosces, such as the humming birds and the hawk moths which lay the eggs of the tobacco worm, thus contributing to cross pollination, the tobacco blossoms are self fertile without insect or other visitation. Their adaptation to insect visitation and attraction, through the nectaries of the blossom, are but a possible co-operation in the widespread cross pollination secured in the vegetable kingdom. If, therefore, we wish to crosspollinize, the blossoms must be emasculated by removal of the immature anthers or pollen sacs, at a time just previous to the full opening of the tobacco Diossom. This period is indicated both by the development of the corolla of the flower, including its change of color, and by the slight yellowing of the anthers, or pollen sacs, at the same time. The emasculated blossoms must then be protected from insect visitation by covering with suitable bags of a hardened paper manufactured fj-this purpose. Since the anthers are removed before maturity, at this time the pistil is not mature, or receptive to pollen; ti e receptivity continues for some days usually, unless pollination occurs. Ripened and bright yellow s from the sort it is de.ured to cross upon such an emasculated pistil, are chosen the next day, or subsequently, and upon the The bag's used in this w., k were manufactured by Schmidt, Dusseldorff, Clermauy, and may be obtained in various sizes. cautious removal of the bag-, applied to the stigmatic. or sticky surface of the pistil of the emasculated blossom. Caution in this manipulation is exercised so as to insure only pollination by these chosen pollen sacs. Such crossing-does not change the plants up( which it is performed, but the cross-fertilized seeds will be ii...show more

Product details

  • Paperback | 172 pages
  • 189 x 246 x 9mm | 318g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236907043
  • 9781236907042