. Horticulture; a text book for high schools and normals, including plant propagation; plant breeding; gardening; orcharding; small fruit growing; forestry; beautifying home grounds; the soils and enemies involved. Fig. 83.—Seed potatoes exposed to the light before planting will develop stubby, greensprouts instead of tender, white sprouts. Strong plants are developed rapidly when thosewith the green sprouts are planted. Left tuber in light four weeks; right, ten weeks. (AfterOhjo Station.) 138 POTATOES tubers should be of large size at this time and further use of thecultivator is apt to dist
. Horticulture; a text book for high schools and normals, including plant propagation; plant breeding; gardening; orcharding; small fruit growing; forestry; beautifying home grounds; the soils and enemies involved. Fig. 83.—Seed potatoes exposed to the light before planting will develop stubby, greensprouts instead of tender, white sprouts. Strong plants are developed rapidly when thosewith the green sprouts are planted. Left tuber in light four weeks; right, ten weeks. (AfterOhjo Station.) 138 POTATOES tubers should be of large size at this time and further use of thecultivator is apt to disturb them or dig them out of the ground. Spraying for Blight and Beetles.—The two worst enemies ofthe Irish potato crop which can be controlled by spraying are lateblight (Fig. 84) and the Colorado potato beetle. The blisterbeetle and the black flea beetle are sometimes serious pests. Thesehowever can be controlled by the same methods as are used forthe Colorado potato beetle. Spraying with the combined spray will control these enemiesfairly well. Bordeaux mixture used before the blight begins willvery largely prevent its attacks. Poisons applied when the beetles. Fig. 84.—Late blight disease of potatoes showing the shrunken, rotted area. Avoidplanting affected tubers and spray the growing crop with Bordeaux mixture. (OhioStation.) are at work will kill them. For this purpose arsenate of lead orParis green may be used. A combined spray material is made by mixing arsenate of lead orParis green with Bordeaux mixture. The amount of poison usedwith the Bordeaux would be the same as with a like amount ofwater. (See Chapter XXV.) Make up the desired amount of Bor-deaux mixture and add as much poison to it as if it were merelywater. When this combined spray is applied to the potato cropthe beetles are killed, better than when the poison is used withoutthe Bordeaux because the spray material is not so easily washedoff by rains. The plants are not so likely to be injured by thearse
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