How do you prevent bitter pit? Can I use the same fungicide (Rally 40SP) I use to prevent cedar apple rust? Starting to see it now on some of the apples, and all this rain isn't helping things.
Bitter pit isn't a disease. It's a physiological disorder. Management is cultural.
See this from Univ of CA
Please post images
Here is a link that might be useful: bitter pit
Calcium chloride sprays are the usual treatment.
Here is a link that might be useful: wik on bitter pit