Reed—Infection Experiments with Mildew. 
539 
RESULTS WITH THE SQUASH, CUCURBITA MAXIMA DUCHESNE 
(table i). 
In twelve of these experiments the conidia were taken 
Boston Marrow and Turban, belong to the species Gucurbita 
maxima. As seen from Table I, twenty-six experiments were 
performed in which conidia of the mildew were sown upon 
seven different varieties of these squashes. Thirty-eight dif¬ 
ferent plants were used. 
In twelve of these experiments the conidia were taken 
from varieties of squashes, in three from cucumber plants (Cu- 
cumis sativus) y in five from the bottle and dipper gourds ( La - 
genaria vulgaris ), in one from the egg-shaped gourd, and in 
three from the pumpkin ( Gucurbita pepo). Infection failed 
to occur m only one experiment. Some or all of the inoculated 
parts became infected in the remaining experiments. Out of 
the nineteen leaves inoculated eighteen became infected, and 
fifty-four out of sixty of the inoculated cotyledons. Two of 
the cotyledons died before the mildew had a chance to develop. 
These experiments show that the squash can be infected with 
conidia taken from all the other cucurbits tested. In the one 
experiment that failed the conidia were taken from another va¬ 
riety of the squash, the Boston Marrow. Conidia from this 
variety, however, in other experiments, infected squash plants. 
There was no apparent difference in the readiness with which 
the different varieties were infected by the mildew. All were 
susceptible. Hor was there any difference observed in the in¬ 
fecting capacity of conidia from different cucurbits. From 
whatever plant taken, the conidia caused infection with equal 
readiness. 
RESULTS WITH CUCURBITA MOSCHATA DUCHESNE, (TABLE II). 
In Table II are given the results with two varieties of this 
’species, the large cheese pumpkin and the winter crookneck 
squash being tested. Ten plants were used, seventeen cotyle¬ 
dons and thirteen leaves being inoculated. The conidia were ob¬ 
tained mostly from the Hubbard squash,. Infection occurred 
