What is this!? 400x mag HELP

Vittles

Vittles

Member
Hi am new to riu but really impressed with the site. Hope some of you clever people can help...
Coming to the end of this years grow and found something weird on a few buds of one plant (only two left now)
Background info:
Organic soil-based grow.
Outdoors until 20.Oct now indoors under HPS400 + fan + humidifier.
Kept at temp range 19-24 C
Kept at humidity range 47-57%
Plants flowering 6 weeks now, hairs mostly red, trichomes 70% milky, none yet amber.

Plants are hybrid, mainly indica genetics, but with some sativa parentage.

Thought this was mold at first and cut away infected branch, which was one of the lowest, and was affected in three places. Now having magnified, it looks weird.

Frame 1&3 show same detail, but with different focus. Frame 1 shows adjacent leaf, which is unaffected. You can see the trichomes with clear space between them. Frame 3 shows focus on foreground, where the space between the trichomes has been covered by white growth. Strangely it also seems tubular in structure like the trichomes, but much thinner. Frame 4 shows closeup of trichomes covered by this other stuff.
Mold? Strange trichome growth?

Any ideas much appreciated! Thanks

:confused:
 

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Vittles

Vittles

Member
Hey GrowTech & New Growth thanks for getting back to me. Stupidly, when I saw the stuff I wanted to play it safe and cut away anything that looked affected. Went thru the trash (as you do) but all I could find was this little piece - and bear in mind it's a day old now. It basically looked like someone had poured loads of icing sugar over those leaves...

Er yes dbo it does, but I'm pretty sure that's not it....
 

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D

dbo24242

New Member
Vittles said:
Hey GrowTech & New Growth thanks for getting back to me. Stupidly, when I saw the stuff I wanted to play it safe and cut away anything that looked affected. Went thru the trash (as you do) but all I could find was this little piece - and bear in mind it's a day old now. It basically looked like someone had poured loads of icing sugar over those leaves...

Er yes dbo it does, but I'm pretty sure that's not it....
Click to expand...
Looks like dank herby but up close it looks a lil wierd, Idk man.
 
Vittles

Vittles

Member
BubbaKushy said:
kinda looks like some weird trichomjke development u recently have any extended dark periods?
Click to expand...

No not with this particular plant. Just the switchover from outside/sun to inside/HPS.
Actually there was one day last week when the timer didn't work and they had a 24h period of darkness.
You think it may have something to do with dark or light cycles?
 
jeff f

jeff f

New Member
i think its just weird seepage of trich juice. almost appears like its oosing out the sides of those microscopic hairs that line the leaves. i say smoke it. but if you die, dont come bitchin to me ;-)
 
B

BubbaKushy

Active Member
Vittles said:
No not with this particular plant. Just the switchover from outside/sun to inside/HPS.
Actually there was one day last week when the timer didn't work and they had a 24h period of darkness.
You think it may have something to do with dark or light cycles?
Click to expand...
yup i think a dark period may be the result of this :)
 
Vittles

Vittles

Member
BubbaKushy said:
yup i think a dark period may be the result of this :)
Click to expand...
oh I have nothing against the odd short(!) blackout ;-)

Altruism said:
looks like trichomes to me, get a friend to smoke some and make sure.
Click to expand...
Good idea, no shortage of those when there's free smoke around :fire:

jeff f said:
i think its just weird seepage of trich juice. almost appears like its oosing out the sides of those microscopic hairs that line the leaves. i say smoke it. but if you die, dont come bitchin to me ;-)
Click to expand...
Sure does look very trich-like right? Dont worry, if there's life after the big toke I'm sure I'll have better things to do :-P
 
Vittles

Vittles

Member
It's back! So today I noticed what looks like a return of the mystery stuff. Its sort of in the same area as it was last time - towards the lower part of the plant. One photo shows where on the plant (red arrows). The other pic is unmagnified and the area with growth is circled red. The other pic is a collage of a few pics of mold I found on the web: cheese mold, blue mold, white mold... Similar tubular translucent structure. What do you guys think?
 
Vittles

Vittles

Member
RESULT!

Had a tip from a really helpful grower, and subsequent research on the web makes me think I've got to the bottom of this. Because it might be of interest to other growers, I'm putting that info into this thread....

Here's just a few of the things I've found out: (mostly from the University of Rhode Island horticultural program)

The disease is most commonly observed on the upper side of the leaves - yep that's the case with my plant.

Young, succulent growth is usually more susceptible than older plant tissues. Succulent tissue is the most susceptible to infection. - that would explain why its only on the bud leaves and not the fan leaves.

Powdery mildews produce mycelium (fungal threads) that grow only on the surface of the plant. They never invade the tissues themselves. The fungi feed by sending haustoria, or root-like structures, into the epidermal (top) cells of the plant - that is a perfect description of the what can be seen on the magnified pictures of my plant.

The lower leaves are the most affected, but the mildew can appear on any part of the plant that shows above the ground. As the disease progresses, the spots get larger and thicker as massive numbers of spores form, and the mildew spreads up and down the length of the plant (from wikipedia) - again exactly as seen on my plant.

They also list a couple of tips and I thought I'd paste them in here, just in case someone else ever has the same problem: (especially the first point is interesting for growers, I think, based on the life cycle of our special plants and when we feed them which ferts)

Once the disease becomes a problem:
• Avoid late-summer applications of nitrogen fertilizer to limit the production of succulent tissue (which is more susceptible to infection)
• Avoid overhead watering to help reduce the relative humidity or water in the early morning to let the tissue dry as soon as possible.
• Remove and destroy all infected plant parts (leaves, etc.). For infected vegetables and other annuals, remove as much of the plant and its debris in the fall. This decreases the ability of the fungus to survive the winter. Do not compost infected plant debris. Temperatures often are not hot enough to kill the fungus.
• Selectively prune overcrowded plant material to help increase air circulation. This helps reduce relative humidity and infection.
• An alternative nontoxic control for mildew is baking soda combined with a lightweight horticultural oil. Researchers at the University of Rhode Island have confirmed that a combination of 1 tablespoon baking soda plus 2.5 tablespoons oil in 1 gallon of water is effective against powdery mildew on roses. Use of this combination on other crops is still experimental.

I've now cut away all that I could find, but expect it to come back in places so will try and get hold of horticultural oil and apply to the lower part of the plant.

Thanks a lot everyone for your help and input.

Stay safe
 
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