Fiddle fig leaves turning brown
I bought a 1.3m long fiddle fig tree to my house recently. I noticed a few odd spots on the leaves that has got me worried for the health of my plant:
1. The large leaves at the top have pink/rust spots



2. The leaves at the bottom are rather small, slightly pale and are rapidly falling off. They also have brown spots (as if burnt) on them.


At first, I thought that this could be because of physical trauma/change of environment of the plant since I bought it 2 weeks ago. However, I brown spots have gotten worse in the lower leaves and even the healthy looking leaves at the top have some spots now. I am afraid this is due to root rot or bacterial infection. How can I be sure what the cause is? How do I treat it?
I am very new at this, so any advice will be much appreciated.
1. The large leaves at the top have pink/rust spots



2. The leaves at the bottom are rather small, slightly pale and are rapidly falling off. They also have brown spots (as if burnt) on them.


At first, I thought that this could be because of physical trauma/change of environment of the plant since I bought it 2 weeks ago. However, I brown spots have gotten worse in the lower leaves and even the healthy looking leaves at the top have some spots now. I am afraid this is due to root rot or bacterial infection. How can I be sure what the cause is? How do I treat it?
I am very new at this, so any advice will be much appreciated.
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Some info here from the RHS on thrips and treatment (scroll down) http://staging.rhs.org.uk/advice/profile?pid=876
See here for how to care for you plant - includes other pests to look out for -
https://www.rhs.org.uk/Plants/7207/i-Ficus-lyrata-i/Details
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Thrips are very tricky to find, if that's what they are. They usually leave tiny white spots on the leaves.
Wisdom is not putting it in a fruit salad.
Do what Obelixx says, treat any pests that you find and accept that leaves that are already damaged won't turn green again and will eventually fall off. Keep an eye on the new leaves and see if they look healthy. If not, that would indicate something's still not right - pest, disease or incorrect care/conditions.