Florida Agricultural Experiment Station


 Fig. 20. Pointed, mottled cucumber leaf, symptoms of mosaic.

number of plants of families other than those related to the
cucumber which have been found harboring the disease, the sap
of which, if transmitted to healthy cucumbers, will produce the
disease. Recent experiments' have shown that mosaic can be
transmitted from cucumber to muskmelon, pepper, ground cher-
ry, tomato, potato, tobacco, martynia, horseweed, catnip, poke-
weed, milkweed and pigweed. If these weeds have mosaic and
grow around the edges of the cucumber fields, insects can
transmit the disease to the cucumbers. In Florida, mosaic has
been found on weeds on the borders of fields every month of the
 "'Further Studies on the Overwintering and Dissemination of Cucurbit
Mosaic." S. P. Doolittle and M. N. Walker. Jour. Agr. Res. 31:1925.