Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . ance of the usually circular affected part; followed by the appearanceof minute brown pustules, while atthe same time a gray color developsand the diseased area becomes anthracnose is shown in , where an affected leaf, muchreduced in size, is seen, with someportions killed by the fungus. Noparticular part of the leaf is firstattacked, and, therefore, no twoleaves appeiir alike. In some casesthe largest leaves will be diseased,in other plants o
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . ance of the usually circular affected part; followed by the appearanceof minute brown pustules, while atthe same time a gray color developsand the diseased area becomes anthracnose is shown in , where an affected leaf, muchreduced in size, is seen, with someportions killed by the fungus. Noparticular part of the leaf is firstattacked, and, therefore, no twoleaves appeiir alike. In some casesthe largest leaves will be diseased,in other plants only the youngerones ; but sooner or later plants thatare affected will become entirelvunfit for use. To test the rapidityof the growth of the anthracnose,healthy plants, grown in the labo-ratory, were inoculated with thespores, and in from five to seven days the spots sownhad become thoroughly diseased, and were bearing mul-titudes of spores. Spinach is also subject to attack bya leaf-blight, a white smnt and a black mold disease. Treatment for Spinach Diseases.—As alreadystated, the diseases discussed above affect most severely12. FIG. 7G. SPINACH LEAF AFFECTED BY AN- THKACXOSE. 178 FCXGI AKD FUXGTCIDES spinach forced under glass for early market. Thatgrown out of doors is not infested to nearly so great anextent. As it is impracticable to treat the spinachplants with the ordinary copper fungicides, except, pos-sibly, when yery young, such cultural methods must beadopted as will reduce the chances of infection to aminimum. These methods include the collectins: andburning of refuse leaves affected by any of the diseases,and the changing of the location of the beds used forspinach each year, if possible; and if not, the changingof the soil instead. Dr. Halsted suggests raking a mix-ture of equal parts of air-slaked lime and sulphur intothe soil—a measure that is well worth trying. The flor-ist paints his heating pipes with a sulphur mixture, tokeep the air of the greenhouse
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
