Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 71. MUSKMELOK LEAF SHOWING BACTERIAL BLIGHT. being due to the excess of moisture—a sogginess, so tospeak. (Halsted.) Effective preventive measures for this vexatious mal-ady have yet to be found. Presumably rotation of cropswill prove an important method, but if the same germsaffect many widely separated plants, a specially devisedrotation may be required. IHE MELON LEAF-SPOT 163 The Melon Leaf=spot A muskmelon leaf injured by a fungus belonging tothe
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . FIG. 71. MUSKMELOK LEAF SHOWING BACTERIAL BLIGHT. being due to the excess of moisture—a sogginess, so tospeak. (Halsted.) Effective preventive measures for this vexatious mal-ady have yet to be found. Presumably rotation of cropswill prove an important method, but if the same germsaffect many widely separated plants, a specially devisedrotation may be required. IHE MELON LEAF-SPOT 163 The Melon Leaf=spot A muskmelon leaf injured by a fungus belonging tothe genus Phyllosticta, is represented in Fig. 72. Itcjauses light colored spots, which may eventually break. FIG. 72. MELON LEAF-SPOT DESEASE. away and give the leaf a very ragged appearance. Thefungus reproduces by means of small spores, which aredeveloped in great abundance. Presumably sprayingwith fungicides will have a preventive effect. FUNGI AFFECTING THE POTATO The Downy Mildew, or Late Blight Phytophora infestans A sufficiently full account of this disease has alreadybeen given in the Introduction (pp. C-10). A large pro-portion of the potato maladies in the United tStates have,until lately, been attributed to this fungus; but recentobservations indicate that other agencies are at work—particularly the fungus known as Macrosjwrium solani,and apparently certain bacteria. The downy mildewdisease has been called, by Professor Jones, of Vermont,the late blight, to distinguish it from the earlyblight, caused by the ]\[acrosporium. Tho late blightfungus generally appears rither late in tlie season; andicS attack is frequently sudden and fatal, affected plantsIxinGf entirely destroyed in
Size: 1409px × 1773px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
