212 BOTANICAL GAZETTE [OCTOBER 
Oidium is that of rotten cabbage.” There is considerable literature, 
too extensive to mention here, dealing with Oidiwm lactis in milk 
products, particularly the relation of the mold to the flavor of 
Camembert cheese. Very little of this literature deals with the 
fungus in relation to plant products. Prrotri and CRISTOFALETTI,’ 
however, have briefly reported the fungus as a parasite appearing — 
in spots on tomatoes in Italy. They suggested that the fungus be 
called Oidium lactis solani. 
The largest losses were noted near Aiatumiows. Burlington 
County. The disease was prevalent in other localities, and losses 
were more or less regular over the entire tomato growing area in 
localities where the disease was observed. While the loss was not 
serious at any one period, there was a rather high loss for the season. 
TABLE I 
BonNY BEST TOMATOES 
AUGUST 12 SEPTEMBER 7 
SPRAY TREATMENTS P. > 
Examined | Diseased |Percentage| pramined| Diseased |*fiseased 
Y, GPO ee 171 a1 12.2 140 25 17.8 
9) CROC a nee 95 17 Ve Big 6. 13 20.3 
By WAS O i ae os 102 12 1% 120 21 17-5 
Coe ns es 120 19 15.8 65 17 26.1 
Data were collected in tomato fields of the so-called second 
early Bonny Best tomatoes, August 12 and September 7, an 
from a late crop of Baltimores, September 19. This was during 
the maximum ripening period of each crop. The data were 
obtained by counting the total large fruits on ten average plants 
and also the number that were diseased. It will be noted in table I 
that the disease was slightly higher on September 7 in the Bonny 
Best tomatoes than it was on August 12. It is very probable that 
the conditions favoring infection were more prevalent September 7 
than August 12. 
The percentages of disease in table II were taken from four 
series of 4~7 applications inclusive of four liquid spray and dust 
3 Perotti, R., and Cristororetti, U., A fruit spot of tomato. Staz. Sper- 
Agric. Ital. 47:169-216. pls. 3. figs. 9. 1914. 
