291 
DISEASE OF CLOVER-LEAF WEEVIL. 
ENTOMOPHTHORA PHYTONOMI ARTH. 
The larva of this beetle, Phytonomus punctatus, was 
found upon the lawn as early this year as April 26, and for 
some time afterward, then disappeared, as it did last year, 
until fall. The larve seen were all sick with the disease 
caused by the fungus, Entomophthora Phytonomi, described. 
in the last report.* The insect was far less abundant than 
last year, and no full grown larve were to be found. The 
disease seems to have nearly or quite exterminated it from 
this locality, for the number was so far decreased by fall 
that but a single larva was detected (on November 9), 
although diligently searched for. 
The late occurrence last fall (November 20) of diseased 
larvee without resting spores, and their early appearance 
this spring (April 26), in the same condition as last seen in 
the fall, makes it evident that the mycelium of the fungus. 
hibernates in the bodies of the living larve during winter, 
thus avoiding the necessity for the production of resting 
spores, which up to the present time have not been de- 
tected. 
The germination of the summer spores under water, by the 
production of mycelial threads, is described in the last report. 
Further study this season reveals the fact that 
Pah, when the spores are germinated upon the sur- 
Nw face of water, or in sufficiently moist air, they 
py take on a different development. Instead of 
at once producing mycelium they send out a 
Fig. 5—Germ- short slender pedicel from one side (Fig. 5), 
mination of which bears a solitary minute spore. The min- 
ae ue uteness of these secondary spores, and their 
or. Maomfed aerial formation, makes it evident that they 
200 diameters, serve for long distance transportation by wind. 
Original. Their germination was not studied. 

STRAWBERRY MILDEW. 
SPH HROTHECA CASTAGNEI LEV. 
There is a large class of surface or powdery mildews 
(sometimes called blights), of which the best and most 
widely known is doubtless that which envelops the pea 
vines with a hoary coating in midsummer. All the forms 
are like the pea mildew in so far that they all, or nearly all, 
produce a delicate white cobwebby growth which over- 
spreads the plant attacked, and gives it a whitened grayish 
appearance. In summer, especially in July, the fungus 
*Report for 1885, p. 258, 
