JAPAN LILY DISEASE 59 



in which the bulbs are grown after the disease has once 

 appeared, consequently the same ground should not be 

 again planted with bulbs for some years. Lime or some 

 similar available substance would assist in freeing the soil 

 from the pest. 



Diseased bulbs should not be allowed to lie and rot on 

 the soil, but should be collected and burned, otherwise the 

 resting-spores present in the tissues pass into the soil and 

 renew the disease. 



Massee, Kew Bulletin, 1897, p. 87, i plate. 



Rhizopus nigricans, Ehr., is stated by Dr. Halsted 

 . Jersey Agric. Coll. Expt. Station, Bull. 76, figs. as 

 causing a soft rot of sweet potatoes in America. The 

 fungus enters the root at points where the surface is broken, 

 develops especially after the roots are stored, more particu- 

 larly if * sweating ' takes place, thus agreeing in all essential 

 points as to mode of attack with Rhizopus means, and in 

 all probability the remedial measures indicated under the 

 last-named fungus would be applicable in the present 

 instance. 



WHITE RUST OF CRUCIFERS 



(Cystopus candidus, Lev.) 



This fungus has a world-wide distribution, and attacks 

 numerous cruciferous plants, both cultivated and wild. In 

 Britain it is most abundant on the common weed called 

 shepherd's-purse (Capsella bursa-pastoris], attacking every 

 part of the plant above ground, and producing much dis- 

 tortion of the affected parts, which are snow-white, and 

 present a polished appearance at first, owing to the forma- 



