18 
BULLETIN 1118, IT. S. DEPARTMENT OF AGRICULTURE. 
The only apparent explanation for this condition is that the rainy 
periods were not of sufficient proportion or duration at the proper time 
to be responsible for general outbreaks in orchards. However, in 
certain localities the proper timing of the necessary factors for com- 
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Fig. 5.— Precipitation and maximum and minimum temperatures at Orlando, Fla., during May, June, 
Julj-, and August, 1918— a period when scab infection was very severe in the nursery. 
plete infection doubtless occurred and may account for the irregu- 
larity of outbreaks. 
Figure 5 gives the temperature range and rainfall at Orlando, Fla., 
during the months of May, June, July, and August, 1918. Table 4 
t*rC*eSJ3AV 
TKUPSDSr 
SATi//?04V 
Fig. 
-Thermographic record of a typical week in summer at Orlando, Fla. 
gives similar data for that period of months during 1918, 1919, and 
1920, while Figure 6 show* a thermographic record for a representa- 
tive week. 
