Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . own of this disease that the only remedial measuresat present to be suggested are the burning of diseasedvines, the selection of healthy seed, and crop rotation, The Lima Bean Mildew Phytopliora phaseoli This fungus first attracted attention two or threeyears ago, in the vicinity of New Haven, Connecticut,where it was carefully studiedby Dr. Eoland Thaxter, whohas published an excellentaccount of it. It does not,as yet, seem to have spreadover a wide area,
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . own of this disease that the only remedial measuresat present to be suggested are the burning of diseasedvines, the selection of healthy seed, and crop rotation, The Lima Bean Mildew Phytopliora phaseoli This fungus first attracted attention two or threeyears ago, in the vicinity of New Haven, Connecticut,where it was carefully studiedby Dr. Eoland Thaxter, whohas published an excellentaccount of it. It does not,as yet, seem to have spreadover a wide area, but it islikely to do so within a fewyears. This mildew generallyfirst appears on the sides ofthe immature pods as a whit-ish, woolly spot, which, dur-ing damp weather, increasesrajDidly in size. The threadsof the fungus penetrate thepod, and may develop on itsouter surface until it forms a thick white coating, whichoften completely envelops the j)od. The tissues of podsso affected are, of course, ruined; they shrivel, blackenand decay. A similar injury to the young shoots isoften produced, and sometimes the leaves also a ^ FIG. 56. LIMA BEAN MILDEW. «, Spoie and zoospores; 6, fruitingtuft. Magnified. 134 FUNGI AND FUNGICIDES This mildew is closely related to the Downy Mildewcausing potato rot, to which it is similar in life-historyand habits. The mycelium develops in the tissues ofthe bean plant, and usually sends out its fruitingbranches through the breathing pores (or stomata).The small spores are produced npon thetips of these branches, as seen in Fig. oG, h. Thesespores generally germinate by means of the so-called zoo-spores (a), m a way precisely similar to the germinationof the potato fungus spores described on Page 8. Nowinter stage of the fungus is 3et known. Treatment.—All leaves, stems and other refusefrom the bean plants should be burned as soon after har-Tcst as possible. Experiments in spraying with fungi-cides have apparently not yet
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
