158 QUINCE CULTURE. 
quickly throughout the whole fruit, when the quince 
almost melts down and becomes black with the profusion 
of spores upon the surface. 
The gray mould (Monilia fructigena, Pers.) is 
another enemy similar in habit to the black mould. 
This fungus is ene of the most serious to plums and 
cherries, causing their decay in a few hours. While 
quinces are not exempt, they, like the apples and pears, 
Fig. 145. QUINCE SHOWY WITH DECAYS. 
may be attacked if the fruit is packed while wet and 
left without ventilation. 
There is a black rot, strictly so-called, which is occa- 
sionally met with in quinces. The fruit becomes almost 
the color of coal. There is a fungus associated with 
this, a member of a genus not usually accused of para- 
sitic habits. It is a Pestalozzia, and does not seem to 
be recorded for this fruit. It has not been cultivated, 
and may prove to be the same as is found upon other 
