14 BULLETIN 562, U. S. DEPARTMENT OF AGRICULTURE. 



Table IV. — Rate of uniting of tobacco in plats at Creeclmoor, N. C, in 1916. 



No. of plat. 



Number of plants wilted. 



June 29. 



July 1. 



July 5. 



July 6. 



July 7. 



July 8. 



July 13. 



July 27. 



Aug. 10. 



Plat A 

 PlatB 



62 



5 



69 



2 



112 



4 



83 

 8 

 95 

 10 

 9 

 5 

 157 



183 



15 



141 



13 



13 



9 



249 



9 



209 

 17 



155 

 18 

 18 

 12 



324 

 10 



232 



246 

 18 



209 

 19 

 22 

 14 



396 

 15 



320 

 25 



245 

 23 

 24 

 30 



534 

 35 



453 

 62 



414 

 44 

 57 

 65 



660 

 95 



568 

 249 



Plate 

 PlatD 



187 



649 



PlatE 







PlatF 







Plat 1-B . . 

 Plat4-A... 



371 



717 

 107 











The results of the experiments at Creeclmoor extending through the 

 past six years thus show beyond doubt that growing corn, wheat, 

 cowpeas, clover, and mixed grasses (redtop, tall meadow oat-grass, 

 and orchard grass), either singly or in a regular rotation, for a period 

 of five years on badly diseased soil will reduce the loss from tobacco 

 wilt to the point where it is almost negligible. Sweet potatoes (but 

 not Irish potatoes) also will greatly reduce the loss from wilt, 

 although they may be somewhat less effective for the purpose than 

 the above-named crops. Peanuts, on the other hand, have practically 

 no value in reducing the loss from the tobacco wilt and should not be 

 grown on infested tobacco soils. The tests with cotton have not yet 

 been completed, but the experience of others in the wilt section seems 

 to leave no doubt that this crop is immune to the wilt and is to be 

 classed with corn, wheat, and grass in this respect. 



Fig. 3. — Tobacco growing after grass and clover, Creeclmoor, N. C. This plat was in 

 grass and clover for five years, 1911 to 1915, inclusive. Only 4i per cent of the 

 plants showed wilt on July 27, 1916. (Plat E.) 



