SPRAYING FLORIDA CITRUS FRUITS 7 
averages equal weight in calculating the general average for the 
five years. On this basis of calculation the total rot curve for 
unsprayed fruit is not materially different from that shown in 
Figure 2 for the unweighted average for six years, but the total 
rot curve for once-sprayed fruit is shghtly lower. 
Comparing Figures 3 and 4, it 1s seen that Phomopsis rot is 
greatly reduced in the once- -sprayed fruit, and that Penicillium and 
miscellaneous rots are only slightly reduced during the first part 
of the holding period but are distinctly reduced later. During this 
later period the quick-developing Penicillium is not a considerable 
factor, and old-age 
rots, such as Colleto- 
trichum and _ Fusa- 
rium, make their ap- 
pearance. Diplodia SPRIVVEO ONCE 
rot is not materially AFPLILIE TOLAY ES 
affected in absolute 
amount. It must be 
remembered, how- 
ever, that when the 
fruit is protected 
from other rots there 
is a proportionate in- 
crease in the chance 
for Diplodia rot to 
develop. The fact 
that the absolute 
number of cases of vb HEEL AN EOD 
Diplodia rot remains 
practically unchanged, 
in spite of an increase 
in the fruit that is 
saved from other rots 
and so remains in the HY 7- S 
test long enough to ZZ GL SSSI 
develop Diplodia rot, s Zig Liss SSS Eee 
means that the liabil- O 59 LEE A AF 3B 
ity to development of 2900S 
this last rot is really Fic. 4. —Proportions of various rots based on total one 
at ts originally in the test, sprayed once with 3-3—50 Bor 
reduced. This is fur- So 1 per, cent oil between April oe 
wn 1 ay 5, he days. e percentages are based on 
ther sho mn Table tests made in the grove mentioned under Figure 3 and 
2 for four of the during the same five years 
seasons in question, 
where one application of Bordeaux-oil is shown to have had an effec- 
tiveness of 19 per cent against Diplodia rot. The same treatment 
had an effectiveness of 60 per cent, or about three times as great, 
against Phomopsis rot. 
TWO OR MORE APPLICATIONS OF STANDARD BORDEAUX-OIL 
In the case of the plots on which two applications of 3-38-50 
Bordeaux mixture plus 1 per cent oil were made, the interval be- 
tween sprayings of a particular plot was usually 10, 20, or 30 days. 
