Any idea what this could be?

[Leapfrog]

Plants are on their 8th day out of the ground, sitting in ProMix BX and being watered with PH ~6.5 RO water...rather on the drier side and no nutes yet.

Any idea what the cause for the symptoms is?

So far it's showing on only 2 plants out of more.

PS: Bugs have no access to the plants.

[ocitown]

Fungus or virus.

That's just my guess man,heard of some type which is doing weird stuff like that.

I'll look and see if i can find it again for ya.

[Leapfrog]

Originally Posted by ocitown

Fungus or virus.

....

I thought of that, too.

But @ around 35% humidity, no rain what-so-ever and plain sunshine all day long I think @ least the fungi would be very unlikely...

Thanks for looking for that info!

[ocitown]

Look into myles117 posts about his virus issues.

HTH ya bro.

[amoril]

leap, that looks similar to what im encountering, except that yours is yellow, and mine is only green.

best advice I have been given was Mosaic virus, im not sure its my problem, as it seems that its usually accompanied with the yellowing of the spots, not just the spots. could be yours though?

[ricard0]

I've had seedlings look similar and become a bit stunted. But with enough time and care they can bounce back. As for a remedy, i'd suggest the basics maybe a little superthrive/similar to help it deal with the stress. Good luck.

EDIT: Sometimes you just have to wait for new (unaffected) growth to help get the little buddy back on course.

[oldskoolgrower]

I agree that it sounds/looks like some kind of pathogen, probably not fungus because of the low humidity. Humidity that low isn't really great for seedlings either though; they like it quite a bit moister than 35% for the most part, though I do not think in this case that is what is causing this.

[jcj77d]

i would also agree, looks like a pathogen of some sort. but also kinda resembles light bleaching, if these are outside & water sits on the leaves & direct sunlight hits those water spots, it can bleach the leaves, not sure if thats what it is, but throwing it out there.
Diseases of Cannabis are caused by organisms or abiotic sources. Organisms include fungi (first and foremost), nematodes, parasitic plants, bacteria, and viruses. Abiotic (non-living) causes include nutrient deficiencies, pollutants and genetic diseases. Different diseases prevail in different crops (e.g., drug cultivars versus fiber cultivars). Disease prevalence is also modulated by geography and climate. The claim that Cannabis has no diseases is not correct, Cannabis suffers over 100 diseases, but less than a dozen are serious. Serious diseases include gray mold, hemp canker, damping off, assorted leaf spots, blights, stem cankers, root rots, nematode diseases, broomrape, macro- and micronutrient deficiencies, and genetic diseases. Environmentally stressed plants become predisposed to diseases. Stress includes drought, insufficient light, untoward temperatures, or growing plants in monoculture.
Tobacco Mosaic virus - The tobacco mosaic virus can attack a wide range of plants, including tomato, pepper, eggplant, tobacco, spinach, petunia, marigold, and our beloved herb marijuana. On marijuana the virus infection causes light and dark green mottled areas on the leaves. The dark green areas tend to be somewhat thicker than the lighter portions of the leaf. The leaf mottling is seen more easily if the affected plant surface is partially shaded. Stunting of young plants is common and often is accompanied by a distortion and fern-like appearance of the leaves. Older leaves curl downward and may be slightly distorted. Certain strains of the virus can cause a mottling, streaking and necrosis of the buds. Infected plants are not killed, but they produce poor quality buds and low yields. Tobacco mosaic, is incited by a virus. The tobacco mosaic virus is very stable and can persist in contaminated soil, in infected plant debris, on or in the seed coat, and in manufactured tobacco products. The virus is transmitted readily from plant to plant by mechanical means. This may simply involve picking up the virus while working with infected plant material, then inoculating healthy plants by rubbing or brushing against them with contaminated tools, clothing, or hands. Aphids are not vectors of the virus, although certain chewing insects may transmit the pathogen.

Solution - Virus diseases cannot be controlled once the plant is infected. Therefore, every effort should be made to prevent introduction of virus diseases into the garden. Sanitation is the primary means of controlling virus diseases. Infected plants should be removed immediately to prevent spread of the pathogens. The use of tobacco products during cultural practices should be avoided to prevent inoculation of plants with the tobacco mosaic virus. Those people using tobacco or working with infected plant material should wash their hands thoroughly in soapy water before handling your plants.