. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 16 BULLETIN 562, U. S. DEPARTMENT OF AGRICULTURE. Table V.—Condition of tobacco on plats of icilt-infested land at Creed-moor, N. C. which had been planted to crops not affected by the wilt for three, four, and five years, respectively. Period of crop- ping with im- mune crops. Number of plants. Percentage of wilt. No. of plat and year of test. Healthy. Wilted. In rota- tion plat. In check plat cropped to tobacco continu- ously. Plat2-A, 1914. .'... 359 680 871 52 159 107 53 Plat 3-A, 1915 72 Plat 4-A, 1
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 16 BULLETIN 562, U. S. DEPARTMENT OF AGRICULTURE. Table V.—Condition of tobacco on plats of icilt-infested land at Creed-moor, N. C. which had been planted to crops not affected by the wilt for three, four, and five years, respectively. Period of crop- ping with im- mune crops. Number of plants. Percentage of wilt. No. of plat and year of test. Healthy. Wilted. In rota- tion plat. In check plat cropped to tobacco continu- ously. Plat2-A, 1914. .'... 359 680 871 52 159 107 53 Plat 3-A, 1915 72 Plat 4-A, 1916 ... 81 111 these tests, the check plat on which tobacco was grown every year indicates that the wilt was not so destructive in 1914 as in the following two years. In the rotation plat for 1915 it should be stated that on August 3 only 3 per cent of the plants showed the wilt, while only a week later, when the final count was made, per cent of the plants were affected. It is evident that the effectiveness of the rota- tion will depend to some extent on the seasonal conditions, but the growing of immune crops for four or five years probably will re- duce the loss from wilt to a minimum even on very badly infested fields. On such fields it is believed that three years of such cropping will not be sufficient to bring the wilt under satisfactory P2066T Fig. o.—Tobacco growing after peanuts and tomatoes, Creednioor, N. C. All of this plat was cropped to peanuts in 1911 and 1912 ; in the three following years a portion of the plat was cropped to peanuts and a portion was planted in tomatoes. On the plat as a whole 5S per cent of the plants showed wilt on July 27. 1916. There was somewhat more wilt after tomatoes than after peanuts. (Plat C.). 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 Un
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