White dots on plant leaves!!

G

Gimmy-1996

New member

• Mar 28, 2018

• #1

Hi,
I’ve got some white dots on some leaves, in my local grow shop they said to me it’s powder mildew. But under microscope those dots look totally different.... I’ll post the pictures.
The picture under microscope without the white dots is a leave that looks normal, the other microscope picture with white dots is the affected leave.
I really don’t know what to do...any help would be appreciated
Thank you very much

 

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exploziv

pure dynamite

Administrator

Veteran

• Mar 28, 2018

• #2

If this gets worse or spreads then it is PM, if not could be normal. Can you give us some information about the environment you keeping them in? Like humidty, ventilation, temps.. ect.?

 

purplepassion

Member

• Mar 28, 2018

• #3

Possible thrips but your plant doesn’t really look effected much.

 

exploziv

pure dynamite

Administrator

Veteran

• Mar 28, 2018

• #4

Yeah, would be a good ideea to check the undersides of the leaves with microscope for pests or signs of pests.

 

W

Wendull C.

Active member

Veteran

• Mar 28, 2018

• #5

Use a green light to illuminate it. Pm fluoresces, at least to me under a green light when I work at night. It is how i look for pm during my bi weekly pest/disease checks.

 

Cannavore

Well-known member

Veteran

• Mar 28, 2018

• #6

I dont really see anything, imo youre good they are bulbous trichomes. Only glandular heads no stalks. There's more than one type of trichome on cannabis plants.

 

G

Gimmy-1996

New member

• Mar 28, 2018

• #7

I use a migro 100 full spectrum Led light, in a 60x60x160 cm grow box. Temperature between 24/27 Celsius in the day and 19/21 in the night. Humidity is always between 54% and 69%. The things that the only difference between the healthy leaves and the affected ones, are, under the microscope, the “bubbles” that in the affected one some are white. And there is nothing under the leaves...

 

N

noreason

Natural born Grower

ICMag Donor

Veteran

• Mar 28, 2018

• #8

I usually see at least one thread per year treating the same topic...and like every year the answers are the same

Mine is like cannavore wrote.

 

G

Gimmy-1996

New member

• Mar 30, 2018

• #9

Thank you guys for you’re replies!!!

 

T

TanzanianMagic

Well-known member

Veteran

• Mar 30, 2018

• #10

Gimmy-1996 said:

Hi,
I’ve got some white dots on some leaves, in my local grow shop they said to me it’s powder mildew. But under microscope those dots look totally different.... I’ll post the pictures.
The picture under microscope without the white dots is a leave that looks normal, the other microscope picture with white dots is the affected leave.
I really don’t know what to do...any help would be appreciated
Thank you very much

Click to expand...

It's powdery mildew, no doubt.

https://www.zeiss.com/content/dam/M...icroscopes/Stemi-508/BDI-mildew-stemi-508.jpg

The bulbous transparant and black bulbous parts are the fruiting bodies of the fungus.

 

N

noreason

Natural born Grower

ICMag Donor

Veteran

• Mar 30, 2018

• #11

They're thrics. Normal thrics...they're everywhere on plants, even from seedlings just sprouted.


If those were PM now Gimmy should see PM with naked eye and I bet he see nothing strange, isn't it Gimmy?

 

Cannavore

Well-known member

Veteran

• Mar 30, 2018

• #12

spray your stuff with a weak h202 solution if you think it's PM and then scope it out again and see if anything changes

having a good IPM (Integrated Pest Management) is crucial!