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Have you known offgassing to have a negative effect in plastic grow rooms? It really would make sense to me if that was at least part of the problem. Many thanks.

Well hopefully not, I've taken a few measures but sure if problem resurfaces I will. Problem is viruses can look like a number of other things: nutrient deficiency ect. Seedlings tend to have banana shaped leaves, puckering and very slow growth. But two weeks into flowering the worst of them...

for anything on the roots i'd try Gnatoff which has 'Bacillus Thuringiensis subspecies Israeliensis' in it; or so the bottle says. There's a nasty chemical called 'Ailette' if you're desperate for the mildew. I've got a clinically clean room and it's still getting through and yes it just...

what are you running soil? Bio for years and years. Got virus, then tried coco drippers, bubblers and NFT. and u say each tiem its one plant not affected? Viruses tend to leave one plant unaffected. Or if you grew one plant, one branch would be unaffected. do u have 1 mom u...

News report here of tobacco white fly with over 100 different viruses on poinsettias plants, so yes- any bug, any virus, same result. Somehow reinfects despite Particle or Carbon Filter on intake, plus Dusk Suits, Gloves, Bake Soil, Steam Clean Rockwool, Sulfur Bombs, Gnat-Off (might help your...

The air is drawn in through a filter, haven't had mites for 15 years or so. I chucked the used soil mix outside and it infected the evening primrose plants. There are articles in weed magazines here; it's starting to put a lot of people out of the game. Although apparently only small grow rooms...

set-up 2x 600 watts Good intake and outtake Lined with white-out 9 ft long - 6 ft wide - 9ft in height Picked up the problem with Bio, tried NFT, Bubblers, Coco, numerous additives have been recommended and one plant always seems to be OK. But basically 12 or so crops over 18 months...

Thanks for the replies but I don't think it's off-gassing or tubing, because that would have shown in the previous 80 or so cycles.

Yes, it's about 4sq m.

Yeah, two weeks into flowering, usually leaves 1 of 12 alone. But trying new seeds that are supposed to be virus resistant plus drawing air from outside.

A virus has got into my last 12 crops somehow, seems to be reinfecting despite total replacement of all equipment and scrupulous hygiene. I suspect it is in the fabric of the house and being dragged in by the extractor. any suggestions?

virus' A virus has got into my last 12 crops somehow, seems to be reinfecting despite total replacement of all equipment and scrupulous hygiene. I suspect it is in the fabric of the house and being dragged in by the extractor. any suggestions?