27 



Club-Root. 



It is sometimes asked whether the deformity on the roots of the 

 cabbage known as club-root is caused by the maggot or has any 

 relation to it, and so it may be well to state that the maggot and 

 club-root have no connection whatever. The latter is a fungus 

 disease and when maggots are found in diseased cabbages they 

 are present as an accident merely. 



The observations and experiments made during the season of 

 1906 were by or under the supervision of Mr. Dickerson, who has 

 also prepared the general account giving the life histories of the 

 insects. 



