196 



"Spotting" of Apples in Great Britain 



rotting took place earlier. A sound Cardinal apple placed in contact with 

 the diseased specimen rotted within a month. 



In the case of the varieties Rival, Wealthy, and Allington Pippin, 

 no fungus other than Pleospora was isolated from the rotting areas which 

 developed in the apples inoculated with Pleospora. 



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Fig. 4 (a- b). "Spots'" on surface of apple enlarged showing black reproductive bodies of 

 fungi (r). (c-d). Group of "spots" enlarged showing lenticels (/). 



In the case of the Cardinal apple, however, the presence of a second 

 fungus, Polyopeus purpureus, in the diseased tissue was revealed from 

 re-isolation tests made after Sept. 13th. On the following day cubes from 

 the diseased portions in which Pleospora mycelium was present were 

 placed in petri dishes in a moist atmosphere. The mycelium which 



