Does anyone have a clue what these black spots are on my tomatos these spots are also
on my squash and pole beans .
My system has been running for seven months i have a 300 gal tote with 12 2" talapia
with 3 grow beds 6' x 4' planted to the limit with lettuce, starwberrys, squash , beans,ect .
Also my squash has lots of flowers but does not fruit flower wilts and fall off .
PLEASE HELP .
Any info will help.
It might be phosphate that you need. I have a 6.6 ph so I had black and purple leaves and then started to add phosphate and they can back. I am getting purple leaves again so I am adding more now.
I notices some similar spots on mine a while back, they have since gone away and the plants are doing very well. The only changes I have made would be the addition of some iron, and the fish have grown considerably - can't say which of those two might have helped but I wouldn't panic if I were you.
Could be a Magnesium deficiency. This can be treated with Epsom Salts in a weak foliar spray solution or ad a little to your fish tank. Worth a try anyway.