22 BULLETIN 78, l". S. DEPARTMENT OF AGRICULTURE. 



(timothy, herd's grass, and clovei) which had been quite weedy. 

 Natural food plants of the tobacco Crambus were abundant. This 

 series was made for the purpose of ascertaining the effect on the 

 tobacco Crambus of preparation of weedy land at different times 

 during the fall and winter as compared -with spring preparation of 

 land. The field was divided into 6 plats containing one-half acre 

 each. Tobacco was planted in all plats on the same date. The 

 amount of fertilizer applied to each plat was the same. 



In plat Xo. 1 the land was plowed September 6, 1910, and fallowed 

 February 25, 1911. It was harrowed and disked on April 3, April 10, 

 April 20, and May 3. The stand of tobacco was nearly perfect after 

 the first planting except along one end of the plat. The percentage 

 of a stand secured was 95.4. In the preparation of this plat it will be 

 nfrticed that the land was plowed during the first part of September, 

 a time just after the larvae had hatched. 



Plat No. 2 was plowed December 8, 1910, and fallowed February 28, 

 1911. It was harrowed and disked on April 3, April 10, April 20, and 

 May 3. Tobacco was replanted once. About 85 per cent of a stand 

 was secured at the first planting. 



Plat No. 3 was plowed January 8, 1911, and fallowed or replowed 

 February 28, 1911. It was harrowed and disked on April 3, 10, and 20 

 and May 3. Tobacco was replanted once. About 85 per cent of a 

 stand was secured at the first planting. 



In plat No. 4 the land was plowed on April 11. No further treat- 

 ment was given until the third week in May, when the land was 

 prepared and bedded for planting. The tobacco was replanted three 

 times. About 51 per cent of a stand was secured at the first planting. 



In plat No. 5 the land was plowed on January 18, 1911, and disked 

 May 15. Tobacco was replanted three times. About 70 per cent 

 of a stand w r as secured at the first planting. 



Plat No. 6 served as a check plat. The land was plowed during 

 the third week in April, and was prepared for planting on May 15. 

 Tobacco was replanted three times. About 55 per cent of a stand was 

 secured after the first planting. 



Further cultural experiments were conducted on the S. L. Ferguson 

 farm, in Appomattox County, Va., in the season of 1911-12. This 

 series was made to ascertain the effect of deep winter plowing and 

 subsoiling of pasture Jand infested by the Crambus. The field of 

 which the experimental plats were a part had been in sod for a number 

 of years and was used as pasture land. The general conditions for 

 the experiment were ideal. The oxeye daisy, buckhorn plantain, 

 and stickweed were abundant. There was not a rank growth of 

 weeds, however, as the field had been quite closely pastured. The 

 field was deeply plowed in February, a subsoil plow following the 

 turning plow, and 1 he clay subsoil was broken up to a depth of several 



