soooo....... heress a few solutions to your problem because i have personally had TMV which has destroyed countless plants and i have ALSO THOUGHT I HAD TMV AND DEFEATED IT sooo.... heres some answers to your questions.
1. yellowing occurs WHEN THERE IS an instability of watering is present , high levels of toxicity in the plants, HEAT temperatures rising in water/grow rooms OVER/UNDER WATERING - which occurs when the plant photosynthesizes and intakes NUTRIENTS WHICH THEN FRY THE LEAVES or KILLS THE PLANT SOME PEOPLE BELIEVE TMV WILL ALWAYS KILL YOUR PLANT AND FRY IT THIS IS NOT TRUE AND YES THERE IS CURES/PREVENTATIVES SO DONT BE AFRAID! =) PHYSCAN 2.0 will ELIMINATE THE VIRUS from the plant it is a plant systemic and to be on the safe side i would check the salt built up in your medium if your running pebbles DID YOU WASH THEM PRIOR TO YOUR USE? or is YOUR COCO/SOIL RETAINING TO MUCH SALT now if there was ANY PEST here could lie more the severe problem.. when plants enter any form of shock sometimes it is not present until the later stages of its life thats why it is believed TMV KILLS EVERYTHING-... when you add all the elements that cause yellowing.... eliminate all the causes that would prevent it it becomes less noticeable...-the cure ? yes. to some degree
YELLOWING FROM NUTRIENTS OCCURS BECAUSE OF AN IMBALANCE OF NITROGEN POTASSIUM ZINC IRON BORON SULFUR AND MAGNESIUM - usually from a deficiency
on the other hand it can ALSO OCCUR from HIGH LEVELS OF PHOSPHORUS
IF YOUR PLANTS ARE INFECTED WITH TMV YOU NEED TO UNDERSTAND HOW IT IS PROCESSED-
SOME FORM OFF CARRIER WOULD HAVE HAD TO TOUCH THE ACTUAL PLANT ITSELF WHICH WAS INFESTED THEN TOUCH THE UNINFECTED OR IF AN INFECTED PLANT WAS NEXT TO AN UNINFECTED PLANT THE PLANTS TOUCH WOULD ALSO SPREAD THE VIRUS
THIS IS BECAUSE IT IS A VIRUSSSSS if you have APHIDS SPIDER MITES FUNGUS GNATS THERE LARVAE WHEN ARE IN THE PROCESS OF REPRODUCTION AND MUTATION SPREADS THE VIRUS FAST........
NOW THE YELLOWING FROM UR PICS DOESNT LOOK LIME WHICH WOULD RESULT FROM LIGHT BLEACHING SO MY BELIEF WOULD BE SALT BUILD UP/ALGAE/AND NUTRIENT LOCKOUT FROM THE BUILDUP CAUSING DEFIENCIES ARE YOUR STRAINS NEEDY OF EXCESSIVE NUTRIENTS ? IS THERE ALWAYS STAGNAT WATER
MY ROOM GOT CURED WITH PHYSCAN 2.0 ADDING SAND ON TOP OF MY MEDIUM, ELIMINATING ALL THE BUGS , INCREASING CAL-MG + IRON ZINC BORON DECREASING PHOSPHORUS INCREASING DRIP CLEAN AND CLEAR WATER FLUSHING AFTER IF YOUR POTS ARE HEAVY DECREASE YOUR WATERING AND INCREASE YOUR NUTRIENTS IN FEEDING.
ALSO CHECK IF YOUR NUTRIENTS ADDITIVES CONTAIN HIGH LEVELS OF PHOSPHORUS IF SO CUT IN HALF... IF YOU RE USE YOUR MEDIUM ALSO STERILIZE IF YOU DO ALL OF THIS AND YOUR PLANT SEVERES YOU WILL NEED TO ACCEPT THE FACT THE VIRUS DETERRIORATED THE GENETIC STRUCTURE CAUSING SHOCK AND SUDDEN DEATH....THIS IS WHAT HAPPENS EVENTUALLY IN THE ADVANCED STAGE I WILLL POST PICTURES OF ALL THE STATEMENTS ABOVE TOMMOROW GOODNITE.