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, 

 July, 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,, 

 durmg the months of May, June, July, and August, 1918. Table 4 



MONOIty 



Hfov^soay 



Fig. 6.— Thermographic record of a tjT)ical week in summer at Orlando, Fla. 



gives similar data for that period of months during 1918, 1919, and 

 1920, while Figure 6 shows a thermographic record for a representa- 

 tive week. 



