why leaves yellow and look like powder on leaves

poamgosmokewhenamready

Active Member

• Jun 30, 2008

• #1

my leaves are turning yellow. i got sensi grow a and b jumpstart,carbo load ,heavy harvest summer,and piranha with distiled water and rockwool and the a weed old i have a mh 250 temps around 84 hum like 48 the showing four little leaves but why the yellow on there leaves? and they look like they got some kind of powder on them?ph anround 5.5

 

Ganjaglutin

New Member

• Jul 1, 2008

• #2

Cuz Its THC? IDK. What Color Is The Powder?

 

poamgosmokewhenamready

Active Member

• Jul 1, 2008

• #3

white a week old?

 

amsterdayum

Well-Known Member

• Jul 3, 2008

• #4

is it like dust or is it more of a solid coating?
if its more solid its proly mold or somethin and if it is mold fix it quick

 

poamgosmokewhenamready

Active Member

• Jul 3, 2008

• #5

humatiy i think i gave them some bad weather i just hope they go come back to life cause of the yellow tips and curled leves up and down the ph was to high like over 7 in rockwool so,nutes was at 1300ppm as baby a week old a mean they grew some of the stems are purple i dont guess they ill live my nutes now are at 495ppm still to high ? i just hope they will live.

 

ganjagoddess

Well-Known Member

• Jul 3, 2008

• #6

You could have powdery mildew, but i would think it unlikely.

Powdery Mildew is a spore that you pic up somewhere and transport to your growroom, if the humidity is high enough it can flourish.....

Look into neem oil, as it also helps with PM. I think they may also make a suplhur sprays that take care of it, but it is top priority to identify it correctly firct.

Post a pic or two.