- /4 - 



need for additional scald control mtitbods In some yo^u'i?. During tie past season 

 DPA gave somewhat better scald control than Stop Scald (particularly on CA stored 

 fruit) on Richarcd Dellclouo. Tree sprays of DPA gave very good control of scald 

 on CA Rlchared Delicious and reduced scald 50 per cent on similar fruit placed in 

 regular storage. Post-hairvest treatments of DPA were not superior to tree sprays 

 during the 1961-62 season. 



Rome: 



In Tables 2 and 3 are the 1961-62 results with Rome. 



Table 2. The Influence of Picking Date and Method of Storage 

 on the Scald of Rome Beauty Apples 



Storage 

 Conditions 



Picking 

 Date 



Per Cent Scald* 

 After 7 Days at Room Temp . 

 Slight Severe Total 



32° F in air 



9/29 

 10/9 

 10/24 



2 

 



12 



98 



100 



88 



100 

 100 

 100 



CA - 32" F 



l-TL CO2 + 37. O2 



9/29 

 10/9 

 10/24 



14 



23 



5 





 2 

 2 



14 



25 



7 



*Fruit removed from storage April 20, 1962. 



Table 3. The Influence of DPA and Stop Scald on the Amount of Scald 

 Developing on Rome Beauty Apples After Storage 



Treatment 

 (Ibs./lOO gals.) 



Date Date 

 Applied Picked 



Per Cent Scald* 

 After 7 Days at Room Temperature 



Severe Total Severe 



Total 



Sprays 



Check 



DPA - 2 lbs. 



Stop Scald - 3 pts. 



Dl£S 



Check 



DPA - 1 lb. 



Stop Scald - 3 pts. 



10/10 

 10/9 10/10 

 10/9 10/10 



10/16 



10/16 

 10/16 

 10/16 



32-360F in air 



97 100 

 50 86 

 63 93 



97 

 95 

 51 



100 



100 



87 



CA-32°F. , 37.C02+3%02 



1 

 

 





 

 



1 

 

 





 

 



*Frult removed from storage April 10, 1962. 



The data in Tables 2 and 3 seera to indicate that CA storage alone greatly 

 reduces scald on Rome. Remember this is only one year's data, however. On Rome 

 placed in regular storage both DPA and Stop Scald seem to be far from adequate if 

 these data are typical of what we can expect in other years. DPA appears to be 

 the material to use as a preharvest material and Stop Scald is suggested as a 

 post-harvest treatinent, but don't be surprised if some scald develops on Romes 

 placed in cold storage regardless of which material is used. Our best suggestion 

 based on the data shown is to place those Romes to be sold in late winter or later 

 in CA storage (same conditions as used for Delicious) Spray with DPA within 36 



