The Dutch Elm Disease
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3.) Fif^UEE 3. — On the right is a young American elm 14 days after it was inoculated with the Dutch elm-disease fungus. The seedling in the center is one of the check trees, which were treated similarly except that the fungus was not Inserted In the wound. - The check tree on the left was almost completely severed, hut it showed no signs of wilting The English elm {Ulmus ccunpestris) , the Holland elm {U.
hoUandica) , and the Scotch elm {U. glabra), which are planted to some extent as ornament...als in this country, are likewise susceptible to the disease. ZeK'ova keall, a tree closely related to the elms, also has been found by inoculation to be susceptible.
THE DUTCH ELM DISEASE O SYMPTOMS ITsiially the first symptom of the Dutch elm disease is the sudden wilting of the leaves of a part of the crown of the tree, of the entire tree, or of the tips of some of the side branches. Drying of the leaves and defoliation of the aifected parts may follow. The wilted leaves often turn yellow or brown before falling, and the affected parts stand out in color contrast with the rest of the tree.
What to read after The Dutch Elm Disease?
You can find similar books in the "Read Also" column, or choose other free books by May, Curtis. [from Old Catalog] to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
3.) Fif^UEE 3. — On the right is a young American elm 14 days after it was inoculated with the Dutch elm-disease fungus. The seedling in the center is one of the check trees, which were treated similarly except that the fungus was not Inserted In the wound. - The check tree on the left was almost completely severed, hut it showed no signs of wilting The English elm {Ulmus ccunpestris) , the Holland elm {U.
hoUandica) , and the Scotch elm {U. glabra), which are planted to some extent as ornament...als in this country, are likewise susceptible to the disease. ZeK'ova keall, a tree closely related to the elms, also has been found by inoculation to be susceptible.
THE DUTCH ELM DISEASE O SYMPTOMS ITsiially the first symptom of the Dutch elm disease is the sudden wilting of the leaves of a part of the crown of the tree, of the entire tree, or of the tips of some of the side branches. Drying of the leaves and defoliation of the aifected parts may follow. The wilted leaves often turn yellow or brown before falling, and the affected parts stand out in color contrast with the rest of the tree.
What to read after The Dutch Elm Disease?
You can find similar books in the "Read Also" column, or choose other free books by May, Curtis. [from Old Catalog] to read onlineMoreLess
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