Need help with Buena mulata

Hi guys
I started growing three types of peppers this year, for the first time: 3 habaneros, 1 jalapeno and 2 buena mulatas. 
They were all planted at similar time, beginning of march. While they were young I fertilized them with 12-36-12 with every watering (final nitrogen content was 50mg/L)
Later I used 20-20-20 also with final nitrogen content @50mg/L. After my problem appeared I also tried 13-5-28+2Ca+2.5MgO+TE (nitrogen 50mg/L)
 
All these 6 plants stand next to each other and are being treated literally the same. Only difference is that buena mulata flowered more and had more fruit at the time I replanted them to their final pots.
These final pots are pictured, 3.5L (~0.92 US gallons) volume each. I water all of them from the bottom. As can be seen on the pictures (first two) both habanero and jalapeno are doing awesome. Buena mulata (3rd and 4th picture) is suffering from something but I can only guess what.
 
What in your opinion can I do to help them? I don't care for present fruit if its removal means that plants can be saved. Should I cut all fruit off and clip branches a bit? What should I do? At one point buena mulata might have been overwatered but since then (some 2 weeks) I really dried them up. They still look sad and weak. They both had increasingly yellowing leaves with falling off and overall look kinda sad (except their fruit which IMO looks great, I don't expect anything better). I don't know what to do.
 
Thanks for any help and advice!
 

 

 

 

 
 

bump

Any bugs? Spider mites made my leaves look the same. Or maybe magnesium?

Looks like chlorosis. Id check the soil ph if you have a test kit. I notice some white residue on the soil surface. If you have alkaline water, you might need to acidify it a bit and add a little sulphur to tour pot.

Another possibility would be waterlogged roots. Could you have plugged drain holes? Anaerobic soil might present with this kind of whole plant wilt.

Ive watered from below with seedlings, but not container plants of this size. Is that common practice?

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Guys, thank you for responding.
 

Edmick said:

Any bugs? Spider mites made my leaves look the same. Or maybe magnesium?

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Not that I can see any bugs. But I am almost clueless about pests. I started doing this this year and I try to catch and learn whatever I can to do it properly and to understand all aspects.
These mulatas are physically supported by strong and robust habaneros behind them, they are touching. Wouldn't bugs show at least some effect on those surrounding plants?
About magnesium. As I wrote, I started watering them with fertilizer that has 2.5 parts MgO. It's a very weak solution for everyday watering (0.5 gr of powder (13-5-28+2Ca+2.5MgO+TE) per liter). Its very hot here at the moment (~90F with high humidity). I am watering all other plants with 100 ml a day or more if I see any wilting. Mulatas are getting just 50 ml for now. All from below. Would you suggest to "shock" them once with higher fertilizer concentration which will surely bring more MgO?
 
Another thing why I am suspicious about any kind of pest is that this yellowing and leaf fall started after I repotted them. Only with mulatas. Soil, pots, water, fertilizer, location, age is all the same. But it's not impossible as I am pretty inexperienced with it. What are obvious signs of spider mite infestation?
 
Another thing, mulata that looks better than the one I showed here started growing new leaves on the branch "stumps" that previously held leaves. It doesn't look all rosy but better and stronger than this one. But it also has less fruit.
 
 

troutbeer said:

Looks like chlorosis. Id check the soil ph if you have a test kit. I notice some white residue on the soil surface. If you have alkaline water, you might need to acidify it a bit and add a little sulphur to tour pot.

Another possibility would be waterlogged roots. Could you have plugged drain holes? Anaerobic soil might present with this kind of whole plant wilt.

Ive watered from below with seedlings, but not container plants of this size. Is that common practice?

Sent from my SAMSUNG-SM-G870A using Tapatalk

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I don't have a pH tester. I do have slightly alkaline water which I leave in an open bottle for some time. But I am mixing it with fertilizer that is supposed to bring pH down. But I am willing to try it, I learned that chillies like slightly acidic soil. I don't have sulphur. Is a pinch of citric acid also ok?
 
There might have been a waterlog at one point when I repotted them. These mulatas were literally first "big" plants that I ever repotted and I might have packed soil a bit too hard and then watered them too generously (for size of their roots and soil type). While repotting I noticed that habaneros and jalapeno to an extent had wild, robust, fat roots like ropes while mulatas were thread like. Habaneros and jalapenos are definitely more capable of sucking all water up and transpiring it through their lush foliage.
 
Drain holes are not stuck as soil takes the water up from the pot plate. But this is a good idea. I will poke those holes carefully with a screwdriver just to make some additional room for air in case soil is hard pressed.
 
I am watering from below because this year I am fighting with fungus gnats since winter, from other plants. Another reason is that I am not completely satisfied with soil I got this year. I think its not porous enough. Now I know where to get better soil but its late. And besides, all other plants are doing fine.

After all it seems that it was some sort of mite problem. I found white and red ones on the same leaf. I got spray based on 0.5% permethrin, washed the leaves and after drying sprayed them both thoroughly.
We'll see how it goes.

CruncheeFrog said:

After all it seems that it was some sort of mite problem. I found white and red ones on the same leaf. I got spray based on 0.5% permethrin, washed the leaves and after drying sprayed them both thoroughly.
We'll see how it goes.

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Just stay on top of them. They can be tough. They killed 5 of my zucchini plants this year before i could figure out what was going on.