New York AcricuLttruraAL ExpprRimMEent SraTion. 71 
the foliage toward the light could see that almost every leaf bore 
one or more spots. In some cases the spots were so numerous 
as to give the tree a scorched appearance. On the unsprayed 
trees it was difficult to find leaves which were affected, while on 
the sprayed trees it was difficult to find leaves which were not 
affected ; and it was impossible to draw any other conclusion than 
that the spraying was responsible for the spots. 
This discovery, although not an entirely new one, is neverthe- 
less, important, considering that the injury was so widely spread 
and that spraying is almost a necessity to control apple scab and 
codlin moth; and an additional importance attaches to it because 
of the light it sheds on the nature of the disease known as apple 
leaf spot. 
It was now observed that the majority of the spots were in- 
habited by a species of Phyllosticta’, the characters of which 
agree rather closely with those given for P. pirina except for the 
eolor of the spores. The spores of P. pirina are described as 
hyaline, whereas in the fungus under consideration the spores 
appear light brown when seen in mass. Specimens of the affected 
apple leaves were sent to State Botanist Charles H. Peck, who 
writes as follows concerning them: 
PALBANY Ny Now (h Day QO, 
“Dear Mr. STEWART: 
“Your letter of D. 1 and inclosed apple leaves reached me in 
due time. I have no difficulty in finding an abundance of fertile 
perithecia in these specimens. The species is certainly not Phyl- 
losticta limitata, and I doubt if it is P. pirina, though it comes 
near it. The spores of that are said to be hyaline, but in these 
specimens they are too decidedly colored to be properly described 
as hyaline. According to my measurement they are also broader 
than given for P. pirina spores, but just right for length. I 
Should say they are 4-5 » long, 2.5-3.5 broad. The peculiar 
saprophytic habit may have had an influence in modifying the 
character of a species that would on a normal habitat have been 
a good Phyllosticta. It makes an approach to Spheropsis in its 

4TIntermingled with the Phillosticta pyenidia were smaller bodies of various sizes resembling 
pycnidia to the unaided eye, but which, under the microscope, proved to be merely knots 
of short brown hyphe with nothing to prove their identity. They may have been immature 
Phyllosticta pycnidia. Tufts of Macrosporium sp., also, were occasionally found on the spots. 
