The book Laboratory Outlines in Plant Pathology was written by author Herbert Hice Whetzel Here you can read free online of Laboratory Outlines in Plant Pathology book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Laboratory Outlines in Plant Pathology a good or bad book?
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In the material provided, note : — 1. The brown tips of certain needles. This is the first evidence of the disease when the needle becomes infected near the tip. 2. In some cases the entire needle may gradually become straw- yellow in color and then turn brown later in the season. 3. The long rows of black, shiny fruit-bodies of the pathogene on the dead needles. On which surface of the needle do they occur, dorsal or ventral ? draw. On the twigs. The mycelium, grows from the affected needles i...nto the twig and produces hypertrophy. Later the affected twigs die. The branch bearing affected twdgs becomes gnarled and enlarged. Adventitious buds are forced and a witches'-broom is developed. In the specimens provided, OBSERVE : — 4. The hypertrophied twigs and branches. 5. The character of the brooms produced on the older trees. (See Jour. Agr. Res. 6, pi. XXXII.) DRAW showing the effect on the woody parts of the tree. ETIOLOGY The leaf-cast of yellow pine is caused by Hypoderma deformans Weir.
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