Florida Agricultural Experiment Station


 Control: A knowledge of the methods for control of downy
mildew is necessary before a grower can feel safe in risking the
growing of a field of cucumbers, because the disease usually
appears every year in certain localities, and none of the commer-
cial varieties are immune. An experimental plot containing 37
varieties of cucumbers was grown in an effort to determine
whether or not any differences in susceptibility would be evident.
The seeds of these varieties were northern grown. They were


 Fig. 4. Branched conidiophore of downy mildew fun-
 gus and spores that grow upon its branches.
 Highly magnified.

planted and cared for as an ordinary crop, but were not sprayed.
The downy mildew showed up in the plot the same week it did in
the fields and within three to four weeks the plants were killed.
All varieties were attacked by the disease and there was no ap-
parent difference in degree of resistance among the varieties.
 The following varieties were grown: Kirby Staygreen, Vickers
Forcing, Earligreen, Davis Perfect, Long Green, Extra Early
Green Prolific, Arlington Whitespine, Extra Long Whitespine,
Early Cluster, Improved Long Green, Everbearing, Shamrock,
Improved Arlington Whitespine, Panmure Long White, 40 Day,