The book Minnesota Plant Diseases was written by author Edward Monroe Freeman Here you can read free online of Minnesota Plant Diseases book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is Minnesota Plant Diseases a good or bad book?
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E. Sum- mer- and winter-spore stages), cause annually an enormous . Amount of damage. The summer spores first appear in early summer and are formed with great rapidity so that as the grain is growing the disease is also rapidly gaining ground. These spores occur in red lines, crowded between the parallel veins of the leaf. This form is commonly known as red rust and is particularly in evidence after very moist weather con- ditions, for these are very favorable to the rapid development of the fu...ngus parasite. Toward autumn the production of the summer spores decreases and the formation of winter spores be- gins. These are produced in long black lines, chiefly on the stalks and form what is commonly known as black rust. The orange leaf rust makes, as one might say, a specialty of the red rust, or summer spore stage, so that this is the prominent feature of this particular rust. On the other hand the most abundant spore of the black rust is the winter spore, hence its 'Common name. But it must be understood that the orange leaf rust also produces winter spores, and that the stem rust produces summer spores and that both have cluster cups.
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