Tiny black spots on stem and leaf veins

firsttimeARE

Well-Known Member

• Sep 3, 2013

• #1

I've been battling temps and humidity for the past week. 85F @ 75% without dehumidifier and 92F @ 60% with the dehumidifier

Weird freak heat wave we've been having.

I notice these black spots on the leaf stems and it goes up the leaf on all the veins.

I obviously cannot control the heat/humidity or else I would.

I'm just wondering what these spots are.

I look at them under a microscope and they just look like stem discoloration. I notice that most of them start where a stem hair is(you know those tiny white hairs on the stems).

 

hexthat

Well-Known Member

• Sep 3, 2013

• #2

sounds like mold

 

firsttimeARE

Well-Known Member

• Sep 3, 2013

• #3

Can the plant be salvaged? Its on the stems on the lower part of the plant.

 

firsttimeARE

Well-Known Member

• Sep 3, 2013

• #4

Its on my vegging plants also. Looking down the stalk I see round cloudy balls. They look like trichomes at the perfect time to cut. There aren't many. But at 100x I can see them.

I've been scanning the plant pretty well and haven't seen any webbing or mites. No classic leaf damage like mites would leave. Either I'm noticing the start of an infestation or these black spots are something else.

I'm thinking maybe some sort of systematic fungus. It's pretty much on every plant I have in the room on the lower portion of the plant.

 

firsttimeARE

Well-Known Member

• Sep 4, 2013

• #5

Anyone else have a suggestion?

 

firsttimeARE

Well-Known Member

• Sep 25, 2013

• #6

Temps and humidity is normal for the past 3 weeks. Spots seem to be spreading up the plant via stems.

Not sure what it is. If I scrape at the stem with my fingernail theres no discoloration underneath the epidermis.

The plants in veg no longer have the spots, except where they were before. Meaning its not spreading there.

 

firsttimeARE

Well-Known Member

• Sep 25, 2013

• #7

It almost looks like when a phosphorus def. fades away back to green stems but leaves these dots of purple. The plant did have a phosphorus def. as a clone and while I was on vacation it just had straight water(ended up hermie due to stress from lack of food).

 

firsttimeARE

Well-Known Member

• Oct 4, 2013

• #8

Anyone have a clue? I can't find anything on the internet or here.

Its definitely not bugs.

 

M

miduke420

New Member

• Dec 31, 2013

• #9

im having same problem, did you ever figure out what it is?

 

Cpappa27

Well-Known Member

• Dec 31, 2013

• #10

A picture says a thousand words my friend. Could be black spot fungus cause the high humidity and temps you had are perfect conditions for it to thrive. Heres the link I looked at for ya http://www.gardeningknowhow.com/plant-problems/disease/black-spot-fungus.htm good luck my friend.

 

firsttimeARE

Well-Known Member

• Feb 3, 2014

• #11

Not sure what it was. Definitely not that black spot fungus as none of the leaves were affected.

I'm still alive after smoking the buds if that counts for anything.

It never stopped progressing, but never got on buds or leaves. Just on petioles and stems.

I honestly have no clue what it was, the whole stem was purple as a clone from a phosphorus deficiency. Maybe it was the remnants because it didn't look like anything physical was on the surface, just discoloration of the stem in spots. They followed a linear pattern.