209 
(3) As the amount of copper in the Bordeaux mixture is decreased its 
value as a preventive is lessened. 
(4) The application of the Bordeaux mixture should in all cases begin 
early, i. e., about the time the flowers are opening. 
(5) Spraying the vines before the leaves start with the simple solu¬ 
tion of sulphate of copper is decidedly beneficial.* 
ERYSIFHEiE UPON PHYTOPTUS DISTORTIONS. 
By F. W. Anderson and F. D. Kelsey. 
Dr. Byron D. Halsted’s note on Sphcerotheca on Phytoptus distor¬ 
tions in the September Journal is interesting, and concludes by asking; 
“ Have other Phytoptus growths been found infested with members of 
Erysiphece f v So far as observations on the subject go in Montana 
an affirmative answer might be returned. In the article on Montana 
Erysiphece in this number of the Journal by one of the writers, mention 
is made of Sphcerotheca Castagnei , Lev. on S'hepherdia argentea (Bull or 
Buffalo Berry), on Geranium incisum , and on Erigeron Ganadense; also 
of Splicerotheca mors-uvce , (Schw.) B. & C. on Ribes rotundifolium; the 
former fungus on Shepherdia and the latter fungus on Ribes were asso¬ 
ciated with the mites, and the peculiar powdery coating caused by these 
creatures in places almost covered the fungus. In both cases the dis¬ 
torted leaf axils, abnormally developed buds, and thickened brittle 
upper leaves bore the peritkeciaof largest size and in greatest numbers, 
leading us to the same natural conclusion as was formed in the mind of 
Dr. Halsted regarding the benefit received by the fungus through the 
unusual softening of the host tissues. Like him, too, we observed that 
on those portions of the host unaffected by the mite the fungus was only 
in an ordinary degree of development for that time of the year [July 10 
for S. Castagnei, Lev., and June 8, or9, for S. mors-uvce, (Schw.) B. & 0.] 
On the Geranium incisum occurred also some mite together with the 
S. Castagnei , Lev., and again the fungus seemed to be more richly de¬ 
veloped on the doubly affected parts. Late in the season the same 
fungus was found on Erigeron Canadense , and growing side by side with 
this host were plants of Epilobium coloratum badly affected by a mite, 
and the couidial form of an Erysiphece which seemed to b v Sphcerotheca 
Castagnei, although no positive determination could be reached. On 
Oxytropis Lamberti, Astragalus triphyllus , and Astragalus adsurgens, 
Erysiphe communis, (Wallr.) Fr., has been frequently seen in company 
with a mite ; while Erysiphe ciclioracearum, DC., may be found at almost 
any time during the summer in connection with mites on Chrysopsis vil- 
losa , Helianthus (several species), Cnicus undulatus, Erigeron macranthus, 
and Mertensia Sibirica. In every case where these forms of animal 
* Applicable only to this experiment. 
14931—No, 4-3 
