Your "tomato butt" is really longitudinal cracking,which is caused by the skin hardening during times of dry soil and then being unable to expand when the soil is wet: in other words, uneven watering.
Douglas is right ;)
What do they call it and the reason if the cracking is around the top part of the tomato in a circle?
@Mary That is latitudinal cracking, and the reason is the same.
I have had a lot of cracked tomato's and black spots. We have had so much rain I haven't been able to get into the garden and pick and re-tie out any tomato's that have become loose.
Sorry to" butt" in but I love hearing all the garden advice from you Douglas. You must be an avid gardener and you seem to always be spot on. Thanks
@Ginny B That check I promised you is in the mail. LOL!
sooooo funny--- ' tomato butt'!! :D
Thanks Douglas! I wasn't sure.