It's my understanding that sigatoga is NOT lethal even if left unchecked. I have sprayed in the past with fungicides just to ensure the upper leaves stay healthy, but I usually see the lower leaves develop yellow and black spots before dropping..or before I cut them. Now if you see the signs on all leaves of the plant, I would imagine that this would affect fruit production.... just a guess though.
Now, I have a question about sigatoga. It seems as though the problem develops on it's own in addition to being infected by other plants. I think...and again, this is just a guess since I am no expert...that heat and humidity contribute to the development of the diseases... like anthracnose in Avocados and Mangos here in FL.
So, my question is...Have any of you seen symptoms of sigatoga on trees grown in a greenhouse?
Also, please feel free to correct me and add information on the subject.
