396 MANUAL OF FRUIT DISEASES 



rot is fully as objectionable. Usage demands that the name 

 bitter-rot be employed. Quinces grown in close proximity to 

 apples affected with bitter-rot may be expected to succumb. 

 However, if history is a reliable basis for prediction, the disease 

 may never be expected to assume destructive proportions. 

 (See Apple, page 14.) 



REFERENCE 



Halsted, B. D. Some fungous diseases of the quince fruit. The ripe 

 rot of quinces. New Jersey Agr. Exp. Sta. Bui. 91 : 11-12. 1892. 



BROWN-ROT 



Caused by Sclerotinia cinerea (Bon.) Schrot. 



The decay of quince fruit caused by Sclerotinia cinerea is 

 distributed generally over the globe. A closely related species 

 of fungus (S. fructigena) very frequently attacks apples and 

 pears as well as quinces in Europe. Considerably less damage 

 is done to the quince than to apples and pears. It is also 

 less destructive in America than in Europe on any of the three 

 above-named fruits. Sometimes S. fructigena attacks stone- 

 fruits in Europe; however, the brown-rot of stone-fruits and 

 pome-fruits in America is due chiefly or entirely to S. cinerea. 

 The characters of brow T n-rot on quinces are not notably different 

 from those described for peaches, to which the reader is referred 

 (page 270). Special control measures do not seem necessary, 

 at least in America. 



CROWN-GALL 



Caused by Bacterium tumefaciens E. F. Smith and Townsend 



Galls in the form of small swellings occur on various portions 

 of the limbs and twigs of quince trees. Often an entire limb is 

 covered by the irregular, warty outgrowths. Crown-gall is 



