Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . ndercertain atmospheric condi-tions ; so that the myceliummay exist in the aSected partsof the vine for some time be-fore this outward manifesta-tion of its presence the spores above de-scribed, which are jiroducedduring the summer season,and, consequently, are calledsummer spores, there is devel-oped in autumn a differentclass of spores, by which the fungus passes through thewinter. Hence, these latter are called the winter
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . ndercertain atmospheric condi-tions ; so that the myceliummay exist in the aSected partsof the vine for some time be-fore this outward manifesta-tion of its presence the spores above de-scribed, which are jiroducedduring the summer season,and, consequently, are calledsummer spores, there is devel-oped in autumn a differentclass of spores, by which the fungus passes through thewinter. Hence, these latter are called the winter —Eau Celeste is a practical and effi-cient preventive of this disease. Spray first a week orten days before the vines blossom; second, as soon asthe berries are well set; and third, about three weekslater. In very wet seasons it may be desirable to spraya fourth time, but this is seldom done. The other cop-per fungicides, especially the Bordeaux mixture, woulddoubtless prove equally effective, but eau celeste hasbeen most generally used against this fungus, at least insome of the more important grape-growing regions ofthe FIG. 41. FRUITING BRANCHES,GREATLY MAGNIFIED. THE POWDERY MILDEW 85 Literature.—An excellent account of this downymildew, by Professor F. L. Scribner, may be found inthe United States Department of Agriculture, Keportfor 1886 (pp. 96-105). Since then much has been pub-lished, in the Department reports and bulletins, in ex-periment station bulletins, and in the horticulturalpress, concerning remedial measures. The Powdery Mildew Uncinula ampelopsidis The powdery mildew of the grape seldom becomesseriously destructive, except in the Southern States andalong the Pacific coast. It only thrives in very dryweather, and attacks all the green parts of the vine. This fungus is closely related to the powdery mil-dews affecting apple and gooseberry, which are discussedon other pages of this book. During summer reproduc-tion takes place by means of summer sp
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
