i6o 
Journal of Agricultural Research 
Vol. VIII, No. 4 
had produced colonies 3 mm. in diameter and was fruiting by the end of 
the month; B . cinerea and S. cinerea had produced colonies 0.5 mm. in 
diameter, but Alternaria sp. had little more than germinated. 
A second series of germination tests was made in which the above 
results were confirmed. In this experiment it was also found that the 
Fig. 25.—Graph showing the comparative growth of the different rot fungi on 
•i com-merl agar petri dishes, second experiment. The curves show the average 
" daily increase in diameter. With Botrytts cinerea and Trichoderma sp. they 
are based on the increase in diameter between the second and fifth days after 
inoculation, with Spkaeropsis malorum on the increase between the second and 
seventh days, and with all the other fungi on the increase between the second 
and eighth days. 
spores of Neofabraea mdlicorticis germinated at o° and that the fungus 
had fruited at that temperature at the end of 60 days. 
The above results show that with a favorable medium Penicillium 
expansum is able to make a better start at o° than any of the other 
fungi. The fact helps to explain its common occurrence in cold storage 
and is in agreement with the idea already suggested that its failure to 
grow on rather immature fruit at o° is due in part to its weak parasitism. 
