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LIBRARY 



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UNITED STATES 



DEPARTMENT of AGRICULTURE 



DEPARTMENT CIRCULAR 396 



Washington, D. C. 



September, 1926 





THE CONTROL OF APPLE SCALD WITH 

 SHREDDED OILED PAPER 



CHARLES BROOKS 



Senior Pathologist 

 and 



J. S. COOLEY 



Associate Pathologist 

 Office of Fruit Diseases, Bureau of Plant Industry 



CONTROL OF SCALD IN BARREL APPLES 



Shredded oiled paper was developed 

 for the control of apple scald in the 

 barrel pack. It has now been under 

 commercial test for three seasons and 

 when properly distributed in the pack- 

 age has proved highly efficient in scald 

 control. 



The results of 19 different tests with 

 shredded paper, covering 7 different 

 varieties, are shown in Table 1 and in 

 Figure 1. The records were taken after 

 the fruit had been out of storage and in 

 a warm room for three days. The per- 

 centages are based on the number 

 of apples having sufficient scald to 

 be discriminated against on the mar- 

 ket, the apples having mere traces or 

 touches of scald not being included. 



It will be seen that in the untreated 

 barrels from 24 to 96 per cent of the 

 apples were scalded, whereas in those 

 having shredded oiled paper there were 

 but three instances where more than 7 

 per cent of the apples were scalded, and 

 there were eight instances where they 

 were entirely free from scald. On the 

 untreated apples the average percent- 

 age of scald was 67, whereas on the 

 apples in shredded paper the average 

 was 4. The reduction in the disease 

 from the use of the shredded paper is 

 very significant. 



The experiments of Table 1 were all 

 made on barrel apples. Tests have 

 also been made with apples in hampers, 

 baskets, and boxes with equally good 

 or somewhat better success in scald 

 control. 



Z.S?i/£/9>46£ 0£/9 £*P£g/M£A/TS, 



mshpe00e0 o/l£0 p4pep 

 bappels 



/bj l/mtpe/?t£0 bap pels 



//V 



P££C£A/Ts4GE OF SC^LO 

 20 <40 60 



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IT. s4l/££S?G£ OF 3 £JCP£/9/M£NTS 



TAJSHPED0E0 O/LE0 P/7PEP //V 



B/JPPELS 



APPLES //V CONTACT W/TH P/IPEB Hi 



APPLES NEAP PAPEP, BUT 

 NOT /N CONTACT W/TH- /T. 



(BJ UNTPEATE0 BAPPELS 



Fig. 1.— Results of experiments in the control of apple scald with shredded oiled paper 

 4525—26 



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