Reports of the Survey. Botanical Volume 5

Reports of the Survey. Botanical Volume 5

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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: ...therefore, to select varieties of plants which may show successful resistance toward prevalent diseases--in other words, disease proof varieties. It must, of course, be understood that a variety may be immune from one disease and not from another totally different disease. In the selection of varieties this feature must be constantly kept in mind. Moreover, there are usually other features of importance in plant growing such as annual yield, quality, and so on, which are of great importance in the selection of varieties. The best variety is, of course, that which, under given conditions, will yield the best sum total results. It is sufficient here, however, to point out the fact that plant diseases are very imporant factors in the selection of plant varieties, and that such selection can assist the plant grower in the prevention of diseases. Prevention of spread. The methods of prevention discussed above all deal with a prevention of infection. They are attempts to prohibit the beginnings of a disease. But diseases may sometimes obtain a start and the plant grower may still be able to use preventive methods. The latter now, however, are directed towards a prevention of the spreading of a certain disease--in other words--to prevent epidemics. Such preventive methods usually consist in the burning up of infected plant parts so that the fungus spores or mycelium will be destroyed. The spread of wood rots may be prevented in this way and the infected branches of the black knot of plums and cherries should always be removed and burned. It is well known that a large number of diseases live over winter in the fallen leaves or dead branches of trees or in the stubble of wheat or straw or refuse piles. It becomes apparent that cleanliness must be an...show more

Product details

  • Paperback | 132 pages
  • 189 x 246 x 7mm | 249g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236604555
  • 9781236604552