Crinkly curling shiny leaves

[Shedman]

I have 5 plants 4 weeks into grow using 50/50 perlite/cocco medium in 15lt autopots with air domes.
Nutrient is kept at ph6
all plants have been treated exactly the same and are growing well but 1 is not growing right and is something i have not seen before
the leaves appear "shinier" than the others as if a snail has crawled across them, the surface also appears rougher or more crinkly and the edges of the leaves are starting to roll up.
The very young leaves also sen to show same symptoms to a lesser degree that then worsen as leaf gets older.
Leaves eventually get papery dry and die off.

Anybody got any idea as to whats going on.

[SoOrbudgal]

Canoe/taco leaf heat or bugs look real close underside. Hopefully someone else will chime in.

[Shedman]

Many thanks for your suggestion
I have looked up broad mites and some pictures of plants that have them and I think you may be right.
its very early in the grow and I am not an organic grower so I am going to treat em with some nasty chemical insecticides. By the time they are harvested any residues will have dissapated
some regular dosing with some pyrethrin based bug buster will hopefully do the trick.
unless you have any other effective solutions.

[9fingerleafs]

I think those could be russet mites

[Shedman]

Many thanks for your suggestion
I have looked up broad mites and some pictures of plants that have them and I think you may be right.
its very early in the grow and i am not an organic grower so I am going to treat em with some nasty chemical insecticides.
By the time they are harvested any residues will have dissapated
some regular dosing with some pyrethrin based bug buster will hopefully do the trick.
unless you have any other effective solutions.

[9fingerleafs]

Actually have zero experience with them

[Catfish22]

Looks like heat stress. Is there a heater or heat source, even outside your tent, that is closer to that plant?

[gbauto]

If your environment is on point, then I'd have a CLOSE look for mites.
Wettable sulfur will zap them in veg.

[dilvish]

just remember that pesticides don't diminish if you don't rinse them off. They get absorbed through the soil and the leaves. If it's a bug problem, be absolutely sure before treating the issue. the most organic way I know of is either neem oil or Diatomaceous Earth (Food Grade). sprinkle it on the topsoil and spray diluted onto the leaves (about 1 tsp per litre). Leave it on for a day and then spray it off with clean lukewarm water.

This could also be heat stress. if one or more plants are closer to the heat source than the others then that could be the issue. dry leaves cupping/canoeing s a sure sign of heat stress.

[Shedman]

doubt if its heat stress as they are growing in an outside shed in middle of winter. I have to put heater in shed to keep temp around 20 degrees centigrade as it is and this particular plant is no nearer any heat source than the others.

[dilvish]

the light can also be a heat source. have you actually got a thermometer to see how hot it gets in there? Heat stress with leaves cupping can be a combination of too high heat, humidity and too bright/strong of a light. If the leaves get dry and papery that crispiness it the result of heat stress especially if the tips are curling up..