SPRAVING FLORIDA CITRUS FRUITS 5 
In order to hold the fruit under conditions favorable for the 
development of any form of decay, it was placed unwrapped in open 
boxes in a constant-temperature room held at approximately 70° 
F. Wet cloths were used to maintain a rather high degree of humid- 
ity. These test conditions were much more severe than Florida citrus 
fruit ordinarily encounters in commercial channels, and the resultant 
rot was a maximum showing. It is assumed that the effectiveness 
of any treatment would be proportionately as great, if not greater, 
under less severe conditions. The fruit was examined at 3-day in- 
tervals over a period 
of 36 or more days. 
Cultures were made, es (9RRRREREE 
to distinguish be- #7 ! 
tween the two organ- Sank 
a ies aig ll nee we | eR ED ONCE ATER SINE 15 
O ——— 
Ge PR WE iy —A—SAEWED ONCE MAY 6 70 SOME LE 
diagnose accurately | --4-- SAVED ONCE BEFORE APR. 1 | 
other rots not cer- FO -oor se SAVED CWE A VEUL. 42 7O MAY 35 
tainly recognizable | Po 
in their early stages. 4, 42 
SINGLE APPLICA- S 
TIONS OF STAND- N 
ARD BORDEAUX- 
OIL X 
q 
In analyzing the 
effects of single ap- 
plications of stand- 35, 
ard 3—-3-50 Bordeaux 
plus 1 per cent oil * 
it is useful to com- 2 
bine results of pe 
applications made 
dain the period for i 
best and surest mel- 
anose control, taken  “G-3-@ 9 2 BDA WF I 
to be from April 15 QS 
} 7 Fic. 2.—Development of all rots in oranges from plots re- 
to May 3. This = ceiving one application of 3-38-50 Bordeaux mixture plus 
for two reasons— = per — oil and an Ms oe plots one the 36 
2 ays oO e test. ach line shows unweighted average 
because melanose 1S percentages based on all tests made during six years, 
likely to require such 1920-1925, for plots receiving the spray application 
: within the seasonal period indicated 
spraying in the very 
groves in which stem-end rot is most prevalent, and because there 
might be expected to be a correlation between the control of melanose 
and that of the form of stem-end rot caused by the same organism. 
Applications made before April 15 constitute another natural group. 
Practically all of these were made between March 25 and April 15 
and showed very satisfactory control of melanose. The young fruit 
is known to pass out of its susceptible condition for melanose about 
June 15, and the rainy season starts at about that time, so this date 
is another convenient dividing point. 
*No material difference in effectiveness was noted between 3—3-50 and 3-4—-50 Bor- 
deaux-oil; some of the tests were made with One formula, some with the other. When 
applications were made soon after the blooming period, a reduction was made from 1 per 
cent to one-half per cent oil in the form of emulsion to avoid possible oil injury. 
