Form filled out and pictures

[40AmpstoFreedom]

SOIL:

How long has this problem been going on? 5-6 days
What STRAIN are you growing? Sour Bubble
What was the establishing technique? seed
What is the age of your plants? day 54 flowering
How long have they been in the soil mixture they are in now? 54 days
How Tall are the plants? 30-40 inches
What PHASE (seedling, vegetative or flower) are the plants in? flowering
What Technique are you using? SOG
What size pots are you using? 3 gal one plant per containe
What substrate/medium are you using? What brand of soil mixture are you using? Promix BX + miracle grow gardening soil
What Nutrient's are you using? All organic blazeoneups mix used, Fox Farm Cha Ching 1/4 tsp gal once, and Tiger bloom 1 tsp gallon 3 days ago. Cal Mag + 5-6 watering throughout flowering.
What is the pH of the "RUN-OFF"? 5.8-6.0 might test this again after calibration...
What method of pH test was administered? pH pen
How often are you watering? 3-4 days
What size bulb are you using? 1k watt
What is the distance to the canopy? 25 inches
What is your RH Factor? 45-65% lately its been raining a ton for two weeks caused some white mold to form on inside of one of my GF x BB but thats another issue and I've fixed it.
What is the canopy temperature? 76-85
Is the grow substrate constantly wet or moist? no
Is your water HARD or SOFT? Tap water
Are you using water from a water softener? no
Has plant been recently pruned, cloned or pinched? no
Have any pest chemicals been used? If so what and when? no
Are plant's infected with pest's? no

Plenty of ventilation intake and out + fans moving air.

This appeared to have started at the top and worked its way to the mid section. I am not really concerned about losing the plant or anything but really curious as to what it is so I can maybe prevent it next time if I grow this strain again. It's not happening to any other plants in the tent just 1 or 2 sb's currently.

 

[AlwaysLearning]

Hey sorry to see youre having problems. That is powder mildew, and it can be very bad. There are ways to help though. First a fungaflor bomb will kill the spores. Second a sulfur candle or burner will make them more difficult to come back, however you probably want to wait until after flowering for this. Another product that works great is Dutch Masters Zone and Penetrater. And finally increasing air flow and/or lowering humidity could help prevent this from happening again. I really hope this helps. Best of luck to you.

Always Learning

 

[shaunmulok]

That sucks 40 i have never had it but a mate had it and good airflow and low humidity in flowering under 50%rh is the best prevention like AlwaysLearning said, Good Luck and get onto it quick
shaun

 

[40AmpstoFreedom]

Wow damn...that sucks...will be usng the zone and penetrator on everything I guess...Thanks alot for letting me know what it is!

 

[HeadyPete]

Hi 40amps

The high humidity and almost certain cold temps (what is the lowest spike your temps reach at night/lights out?) are what's allowing the PM to grow...

You can spray all that shit on your plants or you can keep the temps consistent in the happy zone and keep the humidity down to truly stop PM from starting in the first place...you can't keep the spores out of your garden.

Water and hydrogen peroxide (3%) will kill that PM and not leave a residue.

 

[40AmpstoFreedom]

Thanks I have had really bad bud rot too...been using zone+penetator and it seemed to have eradicated it we will see tho!

 

[HeadyPete]

bud rot is caused by warm temps, high humidity and lousy air circulation... perhaps the common thread here....increase/improve ventilation/air circulation

 

[cellardweller]

40Amps..
try some Greencure for powdery mildew. from what I have read it raises the ph of just the leaves and not the soil, so it is able to kill off the mildew.

 

[ridgedogs]

I used Seranade on my plants in bud and it seems to have knocked the PM out. That was about three weeks ago and they are almost done now. It smells really strong like vinegar but doesn't last for more than a day. It's organic too.
For what it's worth I saw you are using Cal Mag in bloom. I found better results using it only in veg. Some times in bloom it would cause some burning on the leaves and some to distort/mutate . It has nitrogen in it so can cause stretching and prolong bloom time.

 

[AlwaysLearning]

Glad to hear that Zone and Penetrator are working for you. There is a link here https://www.icmag.com/ic/showthread.php?t=43220 where several people are using it with success, might be able to find a thing or two written by Mark that will help you dial in the correct dosage for your needs. Hope this helps.

Always Learning