Powedery Mildew, Too cold or too humid?

[CrackLemonade]

I am getting sporadic mildew on random nugs. I can't tell if its too cold or too humid. My grow book says that anything under 76F will trigger mildew Someone at the grow shop told me because I run my lights at night, the early morning dew/humidity is hurting me. I have a 6 inch blower, blowing strait from outside to the low end of the room. He then recommended a filter or pantyhose to stop the water. I know that filters and pantyhose don't filter humidity, but the label on the on of the filter says its stops mold and mildew.

Will a filter help with this mildew?
Should I raise the temps 5 deg F?
Also the last 3-4 days humidity in my area has climbed on average 15%, could that be the cause?

What is your experience level? (first timer, novice, experienced...) SOME WHERE BETWEEN NOVICE AND EXPERIENCED

Your Equipment:
.1) Type and wattage of lights. (MH, HPS, CFL's, tube fluorescents, LED's) HPS 1000WATT
.2) Distance from tops? 36 INCH
.3) Reflector type? (cool tube set-up, bat wing, enclosed reflector, bare bulb...) COOL TUBE/SQUARE HOOD
.4) Is there a consistent fresh air supply?2 BLOWERS ONE FROM INSIDE HOME ONE FROM OUTSIDE
.5) Do you have an exhaust fan and a circulation fan? 900CFM FAN PULLING AIR FROM THE ROOM THROUGH HOOD THEN OUTSIDE AND 18 OSC FAN
.6) What are the bulb wattages, kelvin ratings, and schedule?1000 WATT SUPER HPS

Your medium:
.7) Specific brand and type of soil, (coco, peat based soilless...) and anything you've added to it. (vermiculite, perlite, worm castings...)HYDROTON
.8) Size of container.2 GAL FLOOD DRAIN BUCKETS
.9) Did you use peat pucks (or similar) to root clones or germinate seedlings?I USED ROCK WOOL TO CLONE, ROCK WOOL PREPED WITH 5.5PH WATER

Your nutrients and water:
10) Source of water? (tap, bottled or filtered) What's it's ph before adjusting?TAP 7.2
11) Method of checking water ph. (ph pen, test strips, aquarium test kit...)HANNA COMBO PH/EC/PPM/TEMP
12) Method of adjusting water ph. (phosphoric acid, white vinegar, hydrated lime, PH Up...)PH UP AND DOWN MAD FARMER
13) Specific brand and N-P-K ratio for each bottle. List dosages (quantity per gallon) and current feeding schedule.GH LATE FLOWER BREW AS PER DIRECTIONS
14) How often are you watering between feedings, and how much per watering?EVERY 3 HOURS DURING DAY EVERY 4 AT NIGHT
15) Any additives or tea's? (Superthrive, CalMag, molasses, Mother's Earth...)1 TABLE SPOON PER 5 GAL MOLLASSES
16) Are your ph levels stable, or do they fluctuate?PH DROPS TO SLOWLY
17) What is your ingoing water's ph? ...your runoff ph?5.8 TO 5.6/5.7
18) Do you foliar feed? If so, with what, how often, and at what time do you spray?NOPE FOILER FEEDING

Your growroom:
19) Indoors or outdoors?INDOORS
20) What size of closet, room or hut?ROOM
21) What are the temps and humidity levels while lights are on? ...With lights off?69F - 77F HUMIDITY IS 65% - 75%
22) Have you seen signs of insects in the growroom?JUST FOUGHT SPIDER MITES WITH FLORAMITE THERE ALL GONE

Your strain:
23) What strain are you growing? (Indica dominate or Sativa dom?)LAVENDER SUPER SILVER HAZE ARE THE AFFECTED STRAINS THE HEADBAND IS FINE
24) From seeds or clones? CLONES
25) Is this an autoflower strain?NOPE

CrackLemonade Reviewed by CrackLemonade on 06-12-2010. Powedery Mildew, Too cold or too humid? I am getting sporadic mildew on random nugs. I can't tell if its too cold or too humid. My grow book says that anything under 76F will trigger mildew Someone at the grow shop told me because I run my lights at night, the early morning dew/humidity is hurting me. I have a 6 inch blower, blowing strait from outside to the low end of the room. He then recommended a filter or pantyhose to stop the water. I know that filters and pantyhose don't filter humidity, but the label on the on of the filter Rating: 5

[G13budsmoker]

humidity is to high, get it down to 40-50% in flowering... also you say you have an 6" inlet fan but do you have an exhaust fan? you need good air circulation. dont raise the temp any more, you dont want it above 84, keep temp between 70-80. hope this helps :thumbsup:

[sarah louise]

humidity... powdery mldew can occur during cold or warm weather... still air and high humidlty are the conditions for pm outbreaks.

to treat the problem... 1 oz of bicarb soda, a couple of drops of insecticidal soap and 1 gallon of water - mix and spray plants lightly, either lift the lights or move the plants out until dry. Don't treat at lights out... the plants need to dry off quickly.

Prevention - REDUCE HUMIDITY

keep extraction fans going during lights out... if this makes it too cold, put extraction on a timer set for 15 mins on and 15 off

reorganise your watering so that you are not putting so much water out during the dark period.

[laphter]

I have used Bonide with great results. It is organic, Neem oil and water based. If the outbreak is not too bad run it on a 14 day cycle, but once every 7 days works fine. What size fan are you running? And at what speed? I found that as long as my ladies can handle it, I run my circulation fan pretty high. It keeps the spores from setlling and will also keep the pests from being able to hang out and cause damage. Not to mention it gives the plants a great workout.