868 



Swedes Resistant to Fingeb-and-Toe. 



[July, 



should not be forgotten that at most it is a palliative, though it 

 would seem that the growing of such strains will tend to starve 

 out the fungus in the absence of susceptible weeds. The most 

 certain way of eliminating the disease is to destroy the clubroot 

 spores in the soil by the application of lime, and by prolonging 

 the rotation. We do not. however, as yet know the minimum 

 dressing of lime reomired for this purpose and, indeed, it is still 

 uncertain what the effect upon the soil itself will be following the 

 application of a given quantity of lime to any particular soil. 

 For this reason as well as for other reasons previously discussed 

 it is advisable to explore more fully the possibility of raising 

 varieties of cruciferous crops resistant to clubroot. 



Since these experiments were carried out Danish Variety 4 

 has been placed on the market and is obtainable from the firm 

 Danske Landhoforeningers Froforsyning of Roskilde. Denmark, 

 under the name ,; Studsgaard Bangholm." Possibly further 

 selection from the point of view of resistance to clubroot may 

 result in the production of a resistant strain of some well-known 

 British variety. 



Acknowledgment must be made of the great assistance ren- 

 dered by Mr. Edwin Jones. B.Se., a post-graduate student, in 

 carrying out the trials here reported upon. 



