— 61 — 



From this it would appear as if the long-shaped, yellow fleshed were more 

 resistant against the disease than the others. If, however, the figures for the du- 

 plicate plots of this class are examined more closely, we find in some cases a great- 

 er difference between two plots of the same variety than between any two classes 

 compared with each other. 



Per cent, diseased plants in the long-shaped, yellow-fleshed class of turnips, 1912. 



A-plots B-plots 



Yellow Tankard, Pajbjerg 2 (Helweg) 4.9% 1.4% 



(Faber) 4.1% 8.4% 



(S. F. A) 0.7% 2.1% 



Bortfelder (W.) 2.1% 13.7% 



(A. D. C. S.) 6.2% 10.0% 



(S F. A.) 2.8% 9.0% 



(Sv.) 0.7% 9.3% 



Average 3.07% 7.74% 



1.— Turnip Rot bacillus from culture on Potato agar 

 16 hours at 37° C. x 1000 



2. — Turnip Rot bacillus from 

 culture on beef peptomine 

 agar 16 hours at 30°C. Van 

 Enncgen's method, x 1000. 



Both Yellow Tankard (S.F.A.) and Bortfelder (Sv.) show only 0.7 per cent, 

 diseased roots in the A series. In the B series, again, the Yellow Tankard strain 

 still has a comparatively low figure, or 2.1 per cent, diseased roots, but the Bort- 

 felder strain has been badly attacked in this part of the field, showing 9.3 per 

 cent, diseased roots. The B plots in general suffered more from the disease 

 than the A plots. 



Although all classes were more or less attacked in different parts of the 

 field, the figures seem to indicate that the long-shaped turnips in general possess 

 a slightly higher power of resistance than the globe-shaped. This may perhaps 

 be accounted for by the circumstance that the relative proportion of 'true root' 

 or primary root is higher in the long-shaped ttirnips, whereas the 'hypocotyl' do- 

 minates in the globe-shaped varieties. There is at least an indication that the 



