134 
as I know it lias never been tried in this country on any extended scale, 
but some experiments made this season by J. D. I lusted, of Vineyard, 
Ga., gave favorable results. He dusted on sulphur twice, three weeks 
apart, using a bellows, and making the first application when the peaches 
were half grown. Probably as many as four applications should be 
made. 
On the whole, the best hope of success appears to be offered by the 
method first outlined, i. e., the prompt and persistent removal of sources 
of infection by the destruction of all rotting fruit; but the two methods 
might be combined. 
ANOTHER SPHiEROTHECA UPON PHYTOPTUS DISTORTIONS. 
By Byron D. Halsted. 
As an addition to the note in the Journal of Mycology (Vol. 5, No. 
1) upon the Sphwrotheca phytoptophila, K. & S., found in the buds of 
the distorted branches of thehackberry ( Geltis occidmtalis ), it may be 
said that the mature perithecia of the Sphwrotheca pruinosa , 0. & P., 
were found in abundance in the malformed inflorescences of the common 
sumach (Rhus glabra ), caused by some species of a phytoptus mite. As 
far as can be learned the ascigerous fruit of this Sphwrotheca is rare, al¬ 
though the leaves may frequently be attacked by the mildew and abound 
in the conidia. What is most interesting is that the fully developed 
perithecia were found among the abortive flowers as early as the middle 
of July and at a time when no fruit of this sort need be expected upon 
the leaves. This is another case of the abnormally developed part of a 
host being the most favorable for the growth of a parasitic fungus. It 
is perhaps to be expected that the tissue of a plant rendered more soft 
and irregular upon the exposed surface would supply the conditions 
for a vigorous growth of a mildew that is practically superficial. The 
spores would more easily be held in the niches of the distorted inflo¬ 
rescence and find the proper conditions for a rapid growth. It is also 
interesting to observe that this is also another Sphwrotheca , which 
genus may have a particular fondness for the distortions of mites 
Have other phytoptous growths been found iutested with members of 
the Erysiphew? 
