Annual Report for 1911 of the Botanist. 



379 



An unusually bad example of the corky scab of the potato 

 (Spo)igospora scabies) (see Journal R.A.S.E., Vol. 71, 1910, 

 page 314) was received from Leicestershire. The Member 

 sending it stated that half of the tubers in the bulk he had 

 purchased for seed were attacked. 



Another disease of some interest sent from the Wisbech 

 fruit-growing district, was plum rust. This had attacked 

 several varieties of plums, Czars being particularly badly 

 infected. As a result the foliage was shed prematurely, and 

 the trees were practically bare at the time when the crop l)egan 



Mangold root with crown gall. 



to ripen. The greater portion of the fruit fell before it was 

 mature, and what remained was leathery and unmarketable. 

 I have had several opportunities of observing the disease in 

 the past two seasons and can confirm the account given by my 

 correspondent. This rust produces two spore stages on the 

 plum and a third spore stage on the garden anemone (.4. 

 coronaria). The leaves of tliis latter host plant are attacked 

 in the early spring. They usually become somewhat eloiigated 

 and beai- narrower segments than normally, on which numbers 

 of yellow cluster cups are produced. The spores from these, 



