Weeping fig's leaves are yellow even dark

I have had this weeping fig for two years, now I put it on the balcony everyday.
It grew well but start having some yellow leaves even dark.
Is it sick?
I water it every morning, some time twice a day if it is too hot and spray over the leaves.

When you say you're putting it on the balcony everyday, do you mean you're moving it in every night and out in the morning, or is it staying on the balcony? Ficus tends to resent being moved, so definitely if you're moving it in and out that will cause problems. Even if you just moved it once the move will probably cause it to drop some leaves, and it can also get sunburned since the light outdoors is stronger than even a bright window indoors (I see a spot on one of your leaves that looks like it could be sunburn). Also when you water, are you sticking your finger down into the soil to make sure it actually needs water? Your summers are not that hot, I've heard of people in very hot climates who have containers in full sun who need to water twice a day, but in your area you shouldn't have to especially since I would guess it gets some shade where it is. I'd stick your finger down in the soil and see how it feels, if it's pretty wet then you're watering too much and you ought to hold off before you water again.

Thank you ecrane3
since I moved it to the balcony I never moved it( not even turn the pot)
I didn't test the soil with finger every time, when I see the surface of the soil is dry then i water it.
I also use some fertilizer (liquid all purpose) about once evey two weeks.
I agree with you, and guess the black spot might be from the sunburn but not too sure.
I am on the top floor and there is no shed.
Do you think I should move it into the room?

It's not the black spot that I thought was sunburn, it's the sort of bleached out spot that you can see in the middle on the left side of the picture. If it's been on the balcony for a while then that's probably the worst it'll get, but if you just moved it very recently, you might want to see if you can rig up some shade for it, then each day give it a little more sun until it's used to it.

As far as watering, the surface of the pot will look dry a long time before it's dry underneath, I would definitely recommend starting to do the finger test, you will probably find that you've been watering it quite a bit too often. Remember that most of the roots are down there under the surface of the soil not at the surface, so it's by the roots that it matters whether there's water or not, that's why the finger test is much better than just looking at the surface. Also now that it's outdoors and your humidity is probably reasonably high, you probably don't need to mist the leaves, that can sometimes help when it's indoors in the winter and the humidity inside is very low, but outdoors in your area there's probably plenty of moisture in the air.

It's benn on the balcony since end of May. ( about two months)
I try not to move it to avoid leaves falling.
Do you think those black spots are caused by too much watering?

I will follow your suggestion to test is with finger(maybe I water it too often)

Once again, is there any pest spray you can recommand just in case there is any pest appear so I know what to do?

Thank you again, this is very helpful.

Isn't all the light coming from one direction? You may have to rotate it clockwise 90 or 180 degrees now and then to keep it from leaning toward the light.

By misting, do you mean you spritz the leaves, or the air around the leaves? Spritzing the air accomplishes nothing, and wetting the leaves frequently can encourage disease.

Chlorosis is always a possibility. What analysis fertilizer do you use, and how much? Liquid or granular? The most likely cause of the yellowing is too much or not enough water.

If you are home during the day, why don't you- one time- withhold water until the leaves just begin to wilt, and then drench the plant to flush any built-up mineral salts out of the potting mixture. You may be surprised how long the plant can go between waterings. It is true, however, that plants in the ground require much less supplemental water than container plants, which are totally dependent on us for their water.

The balcony is facing south-west.
from 10.00am till sunset, it has the sunshine.
I just notice that the part facing the sunshine has more yellow leaves then the other side.
When I spray , I spray on the leaves when it is hot but not humid.
fertilizer I use is an all-purpose 10-15-10 liquid one, Schultz is the brand.
I think I should try the way you said to make sure what the problem is.

How "not humid" is it? Ficus isn't one of those plants that needs super high humidity, and in your area outdoors in the summer I don't think your humidity is ever so low that you would need to try and increase the humidity. And as dp72 pointed out keeping the leaves too wet can encourage disease.

As far as recommendations on pest sprays, I can't recommend one until you actually have a pest and know what it is--different pesticides are better for different situations so it's better to wait until you know what your problem is so that you can figure out the best solution for that particular problem. If you want one to have on hand just in case, things with insecticidal soap or neem as the active tend to be effective on a range of insects but are relatively safe for people. But even with them, I'd get your pest ID'd before you just start spraying, that way you'll know what you're spraying will actually work.

Thank you very much.
I will try to be careful with watering first and see.
If the problem is still there then I guess there is some pest control need to be done but yes I will get it ID'd first.
Hehe, there are a lot for me to learn
Thank you again.

Disease and insect problems are not nearly as common as such things as light and watering and the type of soil- environmental issues.

One last point- you know how you can start a fire with a magnifying glass in the sun? The lens concentrates the sun's rays and heat. This can happen with water drops, which act as the lens. If the leaves of your ficus are wet in direct sun, the right drop in the right place can do the same thing that a magnifying glass can.

Have you Googled ficus benjamina culture or some such thing? You will find SOME conflicting advice, so take what you read with a grain of salt, but it's better than nothing. If you can find university-sponsored sites, they are by far the most reliable.

That's very good point.
I did spray water during 12.00----2.00pm
You are right, I found a lot of website telling different stories and got me confused.
I will pay more attention to watering and rotate the pot once in while regaring to the sunshine issue.
Thank you again , I learned a lot today.