Florida Agricultural'Experiment Station


damage his crop. He needs only to be able to recognize the
moths and to watch for their appearance. Since the eggs hatch
in three days, and the caterpillars do little damage until after the
second molt, an abundance of moths in a field means that it will
be necessary to dust or spray in about twelve days. The grower
who finds his field swarming with moths should order his mate-
rials at once.
 The flight of the moths northward can actually be recorded
and predicted in the same manner as the progress of a storm is
watched and predicted by the Weather Bureau.

 FOOD OF THE CATERPILLAR
 The writer has found the caterpillars feeding on but three
plants. In order of the severity of infestation, they are: velvet
beans (Stizolobium sp.), kudzu vine (Pueraria thunbergiana),
and horse beans (Canavalia sp.).
 Some varieties and species of velvet beans are evidently pre-
ferred to others. The Florida velvet bean is always much more
severely damaged than the Chinese when the two are planted
side by side. On the Experiment Station grounds they fre-
quently occupy neighboring plots, where unusual opportunity
is afforded to study the comparative severity of infestation.
 The early varieties have usually flowered before the cater-
pillars become abundant.
 Some notes on the comparative amount of damage done to
different varieties, or species, of Stizolobium when planted side
by side, were made September 9, 1913, at the Station Farm. Four
varieties, Wakulla, Alachua, Yokohama and Florida, were used
in the test. Wakulla is a very early variety, and matures at the
same time as the Yokohama, the earliest of the genus. Alachua,
another selection from a cross, matures one or two weeks earlier
than the Florida. There were three rows of each kind, and they
stood in the field in the order given in the following table, which
shows the comparative damage to the different varieties: