Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . nerally remains pur-ple. The size of the spots varies greatly, single onessometimes being a quarter of an inch in diameter, andothers running together to form large discolored affected leaves finally wither, turn brown and vitality of affected plants is seriously impaired, andif they are not killed outright, the cro]) of fruit pro-duced by them is diminished. Professor H. Garman says that if one of the dis-eased spots ^hQ cut through
Fungi and fungicides; a practical manual, concerning the fungous diseases of cultivated plants and the means of preventing their ravages . nerally remains pur-ple. The size of the spots varies greatly, single onessometimes being a quarter of an inch in diameter, andothers running together to form large discolored affected leaves finally wither, turn brown and vitality of affected plants is seriously impaired, andif they are not killed outright, the cro]) of fruit pro-duced by them is diminished. Professor H. Garman says that if one of the dis-eased spots ^hQ cut through with a pair of fine scissors,the leaf will be found, at the point where the spot isformed, much thinner than elsewhere, because of thekilling and drying out of its substance. Examinedunder a microscope the fungus may now be found to 104 THE STRAWBERRY LEAF-BLIGHT 105 have pushed through the tissues of the leaf, and to haveformed all over the brown central region of the spot,but most abundantly at its margins, small whitish tufts,looking like microscopic shrubs. These are the fruitingparts of the parasite, and are made up of numerous. FIG. 49. STRAWBERRY LEAF AFFECTED WITH BLIGHT. threads, each bearing at its summit a long jointed these latter ripen they are set free, and are scatteredupon fresh leaves by winds and rains, to germinatethere, push into the leaves and form new spots. Thefungus is propagated by these long spores throughout 106 PUJsGI AXD FUNGICIDES the summer, but in autumn the threads of myceliumform solid tissue-like masses in the dead parts of thespots, which finally appear at the surface as small blackdots. By means of these dots or nodules, (which arecalled by botanists sclilerotia) the fungus mainly passesthe winter, but Professor W. R. Dudley has shown that
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectpathoge, bookyear1896
