All my potted figs seemed to be progressing fairly well except for a pale color of the leaves. After using the search feature, I saw add iron would help green up the plants. I top dressed each pot with Espoma iron tone as per directions and watered in. After four days I did not see the results I was expecting. All my fig trees are beginning to show some heave rusting on the leaves and some stems. Today I also noticed mold forming on the top of the soil. I scraped off the top layer of soil and gave each pot a heavy flushing with plain water. They are drying out now. Any suggestions, are the all doomed. Thoughts please. Thanks in advance.

Magnesium deficiency could be causing discoloration try placing them in the shade add less than a teaspoon of epsom salt to the soil and hope for the best.

I had a very similar problem recently.  I added Epsom salt, Cal/Mag with iron, nothing made a radical improvement, then I watered with diluted Miracle Grow and started seeing improvement quickly.

 I used 1/2 Tablespoon per gallon, but I think most recommend a more diluted amount for regular fertigation, like 1 tsp per gallon.

Do you have dolomite in your potting mix?  What is your potting mix?  What fertilizer are you using?  

The problem is general yellowing without interveinal chlorosis seeming to start at top of plant, right?


For me after trying epsom salt, waiting, then dolomite, waiting, then cal/mag, waiting, and no real change, I upped the amount of fertilizer I was using (Foliage Pro), some improvement, but not enough.  

I decided to try a different fertilizer in case my previous jug was off somehow.  My figs started greening up within days after using Miracle Grow,the problem was pretty bad nitrogen deficiency would be my best guess, or something unbalanced in the jug of Foliage Pro. 

My growing media is pine bark fines.  Could very well just be my case, but my plants looked a lot like the pictures above, I first thought over fert, then Mag deficiency. 

Hi,
It could be caused by being in a pot in heat stress and thus lacking water.
Mid-June one of my unknowns had such a look and fertilizer didn't seem to help - except for the tree to grow more clear colored leaves.
Whatever the defiency, I seem to almost have fixed it with weed-tea (stinky water), and by adding 5/10 cm - 3'' of compost on the surface of the pot.
The problem seemed that in growing the tree had "eaten/destroyed" some dirt from the pot (a buried 80 liters trashcan in fact ), and some air pockets might
have appeared in the roots and the top surface had settled allowing the sun to hurt the roots at the top of the pot directly.
The leaves are better now, but the figlets are still a big light colored IMO - but memory ... I just don't remember if they were that light colored at this time last year.
I would say that they were a tad bit darker green.
But if the problem is the heat - one full week of 38°C to 42°C and we are unusually too warm over 36°C- I can't do more - although I haded some cut branches to shade the root-ball ...
So, I would try to add 5cm/2'' of dirt from the nurseries in your pots, as I seem to see that "you've lost" some dirt from the pots .