. Botany for agricultural students . Botany. 358 THALLOPHYTES The conidia and zoospores which they produce spread the disease very rapidly in moist weather. Since the zoospore is a swimmer, it can function more efficiently during moist weather. Moist weather also favors the germination of the conidia. Little is known about the sex organs of the Potato Blight, but in the form which causes the Bean Blight, the sex. Fig. 309.—Leaf of Irish Potato affected with the Late Blight. Bulletin I40, Cornell University. From organs and oospores occur in the seed coat or cotyledons of the seed, in which cas
. Botany for agricultural students . Botany. 358 THALLOPHYTES The conidia and zoospores which they produce spread the disease very rapidly in moist weather. Since the zoospore is a swimmer, it can function more efficiently during moist weather. Moist weather also favors the germination of the conidia. Little is known about the sex organs of the Potato Blight, but in the form which causes the Bean Blight, the sex. Fig. 309.—Leaf of Irish Potato affected with the Late Blight. Bulletin I40, Cornell University. From organs and oospores occur in the seed coat or cotyledons of the seed, in which case the oospore is planted with the seed. In the Phytophthora cactorum,^ which is destructive to Ginseng, the sex organs and oospores have been found in the stem and roots {Fig. 312). There are many Downy Mildews which give us trouble. In fact many of our plants such as Cucumbers, Melons, Beans, Potatoes, Lettuce, Grapes, etc., are attacked and much damaged by Downy Mildews. But the study of the Grape Mildew and Potato Blight has given a general knowledge of their habits. In combatting the Mildews one must reckon with conidiospores, zoospores, and oospores. One is able to check the spread of the disease by spraying the plants with a solution that is poisonous to conidia and zoospores. Phytophthora Disease of Ginseng. Bulletin 363, Cornell Agr. Exp. Sta., 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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