cutting successive slices under each sting until 

 the larval trail disappeared. 



Results 



The results of the first experiment (Table 1), 

 in which eggs were inserted into fruit manually, 

 were consistent with the results of Reissig's 

 study in New York. When fruit were left on the 

 tree until they fell naturally, far more pupae 



were produced from Mcintosh than from Deh- 

 cious, a later ripening cultivar. Mcintosh in- 

 fested on August 20 yielded many more pupae 

 than Mcintosh infested on July 22. For both 

 cultivars after six weeks at 72°, fruit picked just 

 after egg infestation yielded more pupae than 

 fruit that were allowed to fall naturally. 



The results of the second experiment (Table 

 2), in which eggs were inserted into fruit by the 

 flies themselves, again were generally similar to 



Table 2. Development of apple maggot tunnels in 25 apples per cultivar per date averaged over 

 all treatments (Experiment 2, 1988). 



*The greater the value, the more tunneling occurred. Tunnel depth was ranked on a scale of 

 0-7 according to the following criteria: = puncture without tunneling; 1-6 = tunneling through 

 the first 0.08, 0.25, 0.5, 0.75, 1, and 1.25 inches, respectively; 7 = tunneling to the core. 



8 



Fruit Notes, Fall, 1991 



