//VAf/l^S /&? AY/AA&teSX W//VD ittOC/n^//V M/L£5/=^ &MMG4U. /Ar/A&f£5 1 ffZtffr 
470 
Journal of Agricultural Research 
Vol. VIII, No. 12 
/*0/> 2 *PO 
CJ 
< 
o <J 
d 
fi 
there occurred one or two 
typical thunderstorms. 
During July a rainy period 
continued through the 
greater part of the month, 
though from figure 1 it can 
be seen that the inoculated 
plants in the second experi¬ 
ment were only slightly 
diseased on July 15, most 
of the spread probably oc¬ 
curring after that time. 
During this time, however, 
the effects of two West In¬ 
dian hurricanes were felt, 
and the wind blew during 
most of the rain. 
Just how far a falling 
raindrop could splash water 
from the surface film of a 
leaf is hard to conjecture, 
but this must be a factor in 
the problem. It is proba¬ 
bly this that previous au¬ 
thors had in mind in dis¬ 
cussing disease dissemi¬ 
nation; yet the distance 
which the wind blowing at 
the time of the splash will 
carry this ascending water 
is a problem for determina¬ 
tion. The possibilities of 
this chain of action during 
a driving rain are consid¬ 
erable if one includes the 
distance bacteria may be 
carried from the original 
lesion, then splashed up 
again and carried farther, 
and so on, until a dilution 
too great for infection is 
obtained. 
Rolfs concluded that 
rains followed by sunshine 
and wind were not favora¬ 
ble to the spread of the bac- 
