An introduction to agriculture . e-comes brown and withered. While the leaves are thusbeing destroyed the stems gradually turn yellow; thenthey, too, become brown and die. The remedies for both kinds of potato blight are 1,clean seed potatoes; 2, crop rotation; 3, spraying thegrowing plants with Bordeaux mixture. The Colorado Potato Beetle.— The Colorado potatobeetle is commonly called the potato bug. The adultbeetle lays masses of small orange-colored eggs on theunder surface of the potato plant leaves. In about aweek these eggs hatch into small, soft, reddish larvaewhich feed upon the leaves
An introduction to agriculture . e-comes brown and withered. While the leaves are thusbeing destroyed the stems gradually turn yellow; thenthey, too, become brown and die. The remedies for both kinds of potato blight are 1,clean seed potatoes; 2, crop rotation; 3, spraying thegrowing plants with Bordeaux mixture. The Colorado Potato Beetle.— The Colorado potatobeetle is commonly called the potato bug. The adultbeetle lays masses of small orange-colored eggs on theunder surface of the potato plant leaves. In about aweek these eggs hatch into small, soft, reddish larvaewhich feed upon the leaves. These larvae have ravenous 120 AX IXTEODUCTION TO AGIRICULTUEE appetites and if unchecked, they will soon destroy all thefoliage. They are usually killed by spraying the potatovines with a poisonous substance such as Paris green,or arsenate of lead. (See Chapter XX.) 118. Cotton.— The principal crop of the Southernstates is cotton. Cotton is the most valuable fiber cropgrown. In addition to the lint, it produces seeds from. COTTONACREAGE YearhooTc of the Department of Agriculture which cottonseed oil and cottonseed meal are by-products are very valuable. Cotton is grownin all warm countries; and, although it is a tropicalplant, it thrives well in the warmer parts of the temper-ate zone. Our principal cotton growing states are: — Texas Mississippi Arkansas Georgia Oklahoma Louisiana Alabama South Carolina North Carolina OTHER FARM CROPS 121 119. The Plant and Cultural Methods.—The cotton plant is quite large and much branched. It com-monly grows from 4 to 6 feet high. It is an annual andthe crop is grown much like com. Usually the rowsare four feet apart, and the plants 14 to 20 inches apartin the row. The crop is cultivated just as corn is. Theplants produce large oval leaves, four to five inches wide,and numerous large flowers. Each of these flowers, whenmature, develops intoa large, somewhat egg-shaped structure,called the boll. Whenripe the boll burstsop
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