. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 212 CIVIC BIOLOGY (the host is the organism that supports a parasite), hi which he hsts 174 plants, with the fungi that attack each. From this we see that everything Ave try to raise has its fungus enemies: alfalfa has anthracnose, leaf spot, root gall, European root disease, and root rot; the apple has 2-i, among them anthracnose, or l^itter rot, tire blight, crown gall, rust, and scab; beans have 7 : corn, (3; cotton, 9 : the grape, 9 ; potato, 6 : tomato, 8 ; wheat, 7 : violet,
. Civic biology; textbook of problems, local and national, that can be solved only by civic coöperation. Biology. 212 CIVIC BIOLOGY (the host is the organism that supports a parasite), hi which he hsts 174 plants, with the fungi that attack each. From this we see that everything Ave try to raise has its fungus enemies: alfalfa has anthracnose, leaf spot, root gall, European root disease, and root rot; the apple has 2-i, among them anthracnose, or l^itter rot, tire blight, crown gall, rust, and scab; beans have 7 : corn, (3; cotton, 9 : the grape, 9 ; potato, 6 : tomato, 8 ; wheat, 7 : violet, 6; phie, 6 ; oak, 7; and so on through the list. The following Ijacte- rial diseases are common: Pear and apple blight. Leaves turn l^rown as though burned with lire. The germ was supposed . to be carried by bees to the blossoms, but it is probablv inoculated b\ aphides. Limbs that show sj^mptoms of the disease -should l)e cut l)elow traces of the blight and burned. Wilt disease. This disease affects tomatoes, cucumbers, melons, cotton, and Irish potatoes, and causes the plants to wilt rapidly and die. Black rot of cabbage. Hie germ attacks cabl)age, turnips, rutabaga, and cauliflower. Leaves turn black and the plant dies. This disease is common hi America and Europe. Try, at least, to make a preliminary survey, and then choose for intensive study the local types that are most im- portant, and especially those that require general knowledge and united effort of the community to control — the civic. Fig. 101. Loose smut of oats {Ustilago avence) and normal heads. 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 Hodge, Clifton Fremont, 1859-; Dawson, Jean, 1873-. Boston, Ginn
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