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Ln March 1957 these samples were removed from storage and left for five days ai 

 room temperature. After this period all fruits were cut to determine the percentage; 

 of internal breakdown for each preharvest drop control treatment. Since the results 

 obtained were almost identical in both orchards results from only one of them are 

 given in the following table. 



The Influence of Several Preharvest Drop Control Materials on the Percentage 

 of Internal Breakdovm of Mcintosh After 5 Months in Cold Storage 



Treatment 



Date applied 

 1956 



No. trees 



% of internal breakdown after 

 5 days at room temperature 

 March 5. 1957 



Check 



16.8 



The data show that the single treatments of all the materials used had no 

 influence on the percentage of fruit that had internal breakdown. However, when 

 treatments were applied on both September 7 and 21 to the same trees fruit from 

 these trees developed slightly more internal breakdown than the checks. These 

 data indicate that v;eather conditions during the 1956 season were largely re- 

 sponsible for the susceptibility of these apples to internal breakdown rather 

 than preharvest drop control materials. Also, the fact that our Cortland trees, 

 which are not subject to preharvest drop and were not sprayed with drop control 

 hormones, produced fruit that developed a considerable amount of internal break- 

 down, lends support to the previous statement. 



F. W. Southwick 



I I I I I I I I I I I I I I I I 



