Biology Pamphlets Volume 1642

Biology Pamphlets Volume 1642

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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. 1905 edition. Excerpt: ...It was thought at first, theoretically, that weeds or cover crops under the trees in winter would favor the rot by holding moisture. Practically this is not the case, but just the opposite is true. Invariably where there is much growth on the ground the rot occurs on limbs hanging over bare ground, and only to a very limited extent over the covered ground. With a knowledge of the nature of the fungus, the fact thus established is readily PIG. 20. Sound lemons hanging over cover-crop of vetch. The previous winter this same tree with the ground bare was badly affected. explained. It is simply that the growth covers the ground and prevents the dust and dirt, with the spores of the fungus, from getting on the fruit. The experiment of tenting under the trees with burlap, shown in figure 17, was devised with the demonstration of this particular point in mind. By this means, as already described, infection was entirely checked, and the fact demonstrated that orchard infection takes place by spores coming from the ground under the tree. It is not probable that any grower will see his way clear to cover the ground under his lemon trees with burlap or other similar material, though, if he could do this, it would be with the absolute assurance that all orchard infection with brown rot would be prevented, no matter how badly the soil was infested. The fact is a positive one, that any covering between the soil and the lower limbs of the tree prevents brown-rot infection to the extent that it actually covers the ground. The whole area of the orchard does not need to be covered, as infection apparently takes place only from the soil directly under a lemon by dirt spattering up with the rain, except in the case of large, thick trees, which retain a large more

Product details

  • Paperback | 96 pages
  • 189 x 246 x 5mm | 186g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236518047
  • 9781236518040