Three types of plants - and all are affected:
N.lights from seeds, Lemon Kush from seeds & different supplier,
Blueberry/Hawaiian 3rd generation clones.
Worst affected are the younger, the smaller, and the runtish plants.
Least affected are larger ones, with the males ( largest) almost unaffected.
Here are the suggestions from many many sites and posts:
SALT in the Coco- dont think so, Its a good brand that makes
a big issue about having been washed by 3 monsoon rainy seasons.
VIRUS, mosaic, tobacco or cucumber- photos of virus in cannabis that
I have seen have very bright yellow veins and mottled yellowish discoloration
on leaves which I dont have. ( but maybe those photos are not virus !)
Also it is said that virus cannot be transferred from seeds.
MUTATION- from D J Short etc - no, too many varieties affected.
OVER FERT- was running a bit high, but flushed twice 10 days, and again 7
days ago and reduced feed to 400 ppm but young leaves are still wrinkling.
pH- maybe ? I have been using GH test drops - hard to judge the color
accurately but should have been in the 6.0 to 6.5 area.( ordered a digital )
Sodium Benzoate- a preservative- leaching from plastic containers.
Maybe. I'm using a large plastic drum from an ethnic food store for 1st time,
as a reservoir.
Details : All in Coco + 15% perlite, 2 inches hydroton in bottom . Lucas
formula from start, now in 3rd wk of 12/12, under 600w hps. Watered as
indicated by moisture meter- once every day or 2 days.Drain to waste.
Some 'adult' lucas was used on seedlings/clones by mistake for a week.
Reservoir is aerated for 2 hours before feeding.
Thanks for any comments , ideas , or thoughts on this problem.