. Botany for agricultural students . Botany. 356 THALLOPHYTES common and important one of the many Downy Mildews and often causes much loss in grape-growing districts. Its downy white growth occurs most commonly on the leaves, but the Fun- gus often attacks the green shoots and fruit (Fig. 306). Some- times it destroys the fruit crop and weakens the vines. The mycelium consists of coenocytic hyphae, which e^xtend through the tissues of the part at- tacked. The hyphae grow between cells and send into the cells short branches (haustoria) which absorb the cell contents of the host {Fig. 307). The
. Botany for agricultural students . Botany. 356 THALLOPHYTES common and important one of the many Downy Mildews and often causes much loss in grape-growing districts. Its downy white growth occurs most commonly on the leaves, but the Fun- gus often attacks the green shoots and fruit (Fig. 306). Some- times it destroys the fruit crop and weakens the vines. The mycelium consists of coenocytic hyphae, which e^xtend through the tissues of the part at- tacked. The hyphae grow between cells and send into the cells short branches (haustoria) which absorb the cell contents of the host {Fig. 307). The death of the leaf cells re- sulting from the attack is indicated by the occurrence of yellow or brown areas which may involve much of the leaf. This destruction of leaf tissue diminishes the carbohydrates. Fig. 306.— a bunch of Grapes partially de- stroyed by the Downy Mildew. From Farmer's Bulletin 28^, U. S. Dept. of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Martin, John N. (John Nathan), b. 1875. New York : John Wiley & Sons, Inc.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1919
