. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . through which the germinating tubesare to develop are seen at a, while in 3 some germinatingspores arc rci)resented. Treatment.—The knowledge of the fact that oneessential stage of the fungus is passed upon red cedar,leads to the suggestion that, in a given region, the injuryto apples may be prevented by destroying the red is probable that spraying orchards wdth fungicides forscab, or other diseases, will also assist in preventingthe rust. Liter
. Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . through which the germinating tubesare to develop are seen at a, while in 3 some germinatingspores arc rci)resented. Treatment.—The knowledge of the fact that oneessential stage of the fungus is passed upon red cedar,leads to the suggestion that, in a given region, the injuryto apples may be prevented by destroying the red is probable that spraying orchards wdth fungicides forscab, or other diseases, will also assist in preventingthe rust. Literature.—Dr. B. D. Halstead has published anexcellent general discussion of the relations of applerusts and cedar apples, in the 1888 Report of the De-partment of Agriculture (pp. 370-381). Professor A. has also treated of them in the Transactions ofthe American Horticultural Society (v. IV, p. 152), andDr. E. Thaxter, in the 1891 Report of the ConnecticutExperiment Station. The Apple Twig Blight Micrococcus amylovorus The twigs of apple trees, together with the leaves,flowers or fruit which thev bear, often turn brown or. Sprayed. VnsiJrayed. PLATE IV. PEAJl LEAF-BLIGHT EXPEKIMENT. THE PEAR LEAF-BLIGHT 41 black, and die, in a manner similar to that of jiear twigsaffected by pear bliglit. Such injuries to apple are com-monly called Hwig blight, or fire blight. Theyare, however, due to the same germs as the pear blight,discussed on a later page under the pear. Cutting offand burning affected twigs is the best remedial measure. FUNGI AFFECTING THE PEAR The Pear Leaf=blight Entomosporium maculatum This is probably the most generally destructive fun-gous disease to wdiich the i^ear is subject. It appearsearly in spring, soon after the leaves develop, usually revealing its presence atfirst by minute, dull red-dish spots on the upper sur-face of the leaf. A littlelater the spots appear onthe lower surface also, andthe reddish tint gives wayto brown, with a darkercenter. A
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
