-12- 

 prune that IB pertly or wholly covered with this ash-grey or blue-gray 



'mold 1 On cherries and peaches At the disease spreads 



the surface of the diseased tissues becomes covered with the characteristic 

 ash-grey conidial tufts. In apples, pears, and quinces the disease 

 spreads in much the sane way but more slowly, and usually with a less 

 abundant spore formation. 1 * 



He says that the name of this fungus was determined in 1895 by means 

 of prune specimens. 



Norton (11) in 1902 changes the name of the form found in Maryland 



s 



peach and plum orchards from Monilia fructigena to Sclerotinia fructigena. 

 after definitely connecting the Monilia stags with a perfect stage. 

 Norton says that the asci and paraphyses are of the usual form, of the 

 Pezitaceae and of the genus, and -that the asci are 45-60 microns long 

 and 3-4 microns wide with 8 spores in the apical half. He also say* that 

 cultures obtained from the ascoapores produced the characteristic yellowish 

 gray conidia of Monilia fructigena. 



The question of the identification of species has interested several 

 workers in this country, they no doubt being stimulated by the work of 

 Woroain, Aderhold and Ftuhland and other European workers. But our workers 

 seem to have given little consideration to the possible Sclerotinia laaa. 

 or, disregarding the specific names, to the fact that there may be more 

 than two specific, economic fruit rot Sclerotinias. It will be remembered 

 that Norton called the form he studied fructigena. 



Read (12) in 1908 calls the form he has collected on various hosts 

 fructigena. The measurements of the asci he gives as 125-215 x 7-10 microns. 



