Girl_Scout

@NegotiatedBubble, yea I'm not a big fan of hanger strings everywhere either! Not bad! Do you get those props from usual gardening stores?

@jomolhari, yeii they are :heart_eyes:

@Josephmother, thank you :blush:

@Girl_Scout, it's all about the MERV rating for the filter being used. You can pay for a pre-built fan+filter, but I prefer to make a homemade one because I'm cheap like that. Taping a box fan to a square filter is the most basic, but box fans cannot not pull very much air through a high MERV filter. Grow exhaust fans are higher intensity. You can make a box out of cheap rigid foam board insulation from the local hardware store and tape the fan/filter to that box. I found one site that says powdery mildew spores are about 1-3 microns, but I would research that more. Looking at the below chart, it looks like MERV 8+ is a starting point. In general, the higher a filter’s MERV rating, the stronger a fan must be in order to pull air through that filter.     What is a MERV rating?     epa․gov/indoor-air-quality-iaq/what-merv-rating

@NegotiatedBubble, thank very much for the detailed info as always :blush: I might go for it in the next cycle! Yet I don't know how useful it will be with opening the tent few times a day :thinking_face: probably better then without it Ps sorry for replies as fast as pigeon post! extremely busy period of life is here :smiley:

@NegotiatedBubble, sounds very reasonable as well! could you recommend some in particular? I don't know much about them.. I see the models and pricing vary greatly. I see appearance of bud rot this time is luck of care from my side. The tent is very crowded and I've been postponing defoliation. I'm finally taking decision to reduce the amount of plants next time :grinning:

@Girl_Scout, a few more thing help fight powdery mildew: Lowering the temps. Danger zone for Powdery Mildew is 62% - 93% RH and 77°- 87° (25°C - 30°C). For Botrytis (bud rot), it’s all about the RH, since it grows in low temps. I have never tried it, but what about running a HEPA filter in the grow? Theoretically, these PM spores are floating around waiting to germinate on one of your plants. Why not catch them in a HEPA filter to reduce the count? More of a long term solution, but various strains are bred for PM and disease resistance. Outdoor strains are of interest since one cannot control the conditions.

@jomolhari, which one? On buds even? Luckily after I cut this one, no more signs of rot Thank you :blush: I am happy observing the beauty

@NegotiatedBubble, yes.. not they are not

@Girl_Scout, quite a height difference. Are they F1 seeds?

@NegotiatedBubble, this is extremely useful!!! Thank you!! I'll read more about it

@Girl_Scout, Silica helps big time with powdery mildew. Also, when a pest "punches" into the leaf to drink, it chews on a mouth full of glass and moves on.      "as a rule of thumb silicon dioxide is glass so soluble silica goes into the plants and really strengthens cell walls we we know this from many      years of study one of the huge things it does is disease resistance you can almost eliminate powdery mildew with ample silica in the root      zone we've seen it multiple times growers had an outbreak of powdery mildew and you say what's going on well it turns out their silicon injector      broke and it stopped and the disease came back”            Bruce Bugbee: Indoor hemp production      youtu[dot]be/0I6awuKSp2c?t=2003       I am using the USU Crop Physiology Laboratory soilless media recipe this time around. It has calcium and silica (Wollastonite powder). I am also using potassium silicate in the feed. Potassium silicate also makes a very awesome emulsifier for neem oil spray. In the US, I get a pound of Agsil16H for 25 USD from Build A Soil:      buildasoil․com/products/agsil16h-potassium-silicate       I am not sure if silica would help with bud rot (Botrytis), but potassium silicate is still a cheap thing to add that is effective on several fronts.

@NegotiatedBubble, yes indeed! Ritual beheading :grinning: thank you :blush: hope so too! Do you know, is there something that can prevent mold other then more powerful dehumidifier?