whats causing this?

ello there my plants are 19 days into flowering,my leaves have been turning yellow on the bottom of the plants from about the 3rd week of veg but now in flowerin it seems to be yellowing the full plant and saw some alarming brown-black marks on a few leaves. Apart from the bud sites and the tight leaves around the forming buds just about all leaves are looking a sorry shade of yellow,can any1 help theve been goin so well until lately they seem to be getting ill :mad: please any advice would be appreciated

not too shure about the brown spots, but they do look very yellow. how are the ferts?

give them a dose of Mg(epsom salt) on the next wattering or feeding,start with 1tbs to 1gal of water,mix well,then 1/4tsp per gal,every other wattering,the pH may rise a bit,you can lower it with phosphorous or a dilute bloom mix....bonbon

usin the ferts as it says on the bottle,im usin bio-bizz ferts,i flushed the plants with fresh water about a week into flowerin(thought the yellowin was over-fert) to see if it would improve the yellowin but never done them any favours i dont think.
temps never below 65f and never above 85f,humidity various from around 38-40% upto 59%,swapped from 250w mh to 250w hps for flowerin,done a ph test a few days ago,reading neutral (shitty single ph test kit)
plants watered usually every 3 days when the pots feel light,there in 1 gallon pots,exractor fan fitted in grow space,which i left running 24/7 from the word GO,but past few nights decided to switch the fan off when the lights go off to try and keep a bit heat in the grow space and keep the humidity at a good level,cant think of anythin else at the mo

Id listen to bonbon every post his posts are normaly smack bang on :)

Btw they are some nice lookin plants :)

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Originally Posted by wardrobe grower 78

ello there my plants are 19 days into flowering,my leaves have been turning yellow on the bottom of the plants from about the 3rd week of veg but now in flowerin it seems to be yellowing the full plant and saw some alarming brown-black marks on a few leaves. Apart from the bud sites and the tight leaves around the forming buds just about all leaves are looking a sorry shade of yellow,can any1 help theve been goin so well until lately they seem to be getting ill :mad: please any advice would be appreciated

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WHAT STRAIN R THEY BRO :confused:
THEY LIKE LOVLY :eek:

PEACE TO ALL :cool:

cheers bonbon and code,im gonna find out where i can get a hold of this epsom salts from.
co de they are superskunk m8