4 



1 



disease seems to have "been in Europe in 1880 by Von Thumen. It 



was considered most destructive but according to later writers 



1 6 



is not as serious now. Frank mentions it as occurring on 

 plums, cherries, apricots, peaches, appl«s, ana pears. In the 

 United States it was first described by Peck in 1981, and has 

 been investigated by many since then. It is particularly de- 

 structive to stone fruits. Pomaceous fruits are subject to at- 

 tack but the loss is not as great as in Europe. On the plum and 

 peach it is reported on the eastern^ and western^ coasts and as 

 far south as Georgia^, showing its general distribution. On 

 the apple it is not destructive in any part of the country, al- 

 though the apple is well known as one of its hosts. 



It is the Monilia stage with the summer spore^ which 

 causes the rot in all cases. It was not until recently (1902) 

 that the perfect stage was found, ^ The summer spores are borne 

 on the ends of the hyphal threads. The drawings (Figs. D and 

 E) show the mode of branching and also the shape and size of 

 spores as compared with the hyphae. The end spore is always the 

 youngest, as the new spore forms at the distal end and not by 

 splitting off from the hypha. The branches are formed by the 

 end spore forming an angle and a new chain growing at such point 



The ascigerous stage appears about the time the peach 



5 — 18 



blossoms are opening - April 1 to 27th, It seems to be only 



on two-year-old mummies which have been in moist places in or on 

 top of the soil. There are usually several on each fruit. The 

 sinuous stalk of the apothecium is from ,5 to 1,5 cm. long, and 

 from .3 to 1.5 ram. thick. This enlarges into the cup shaped 



