Edema?
Ultravioletanswered grow question 8mo ago
Plants release water vapor and exchange gases, (night). When there is no airflow, the water vapor released by the leaf accumulates in a thin, still layer of air immediately surrounding the leaf surface. This layer becomes saturated with moisture, reaching 100% relative humidity. Providing even a small amount of air circulation, such as with a fan, helps move this humid air away and restores the necessary concentration gradient, allowing the plant to continue its normal functions.
Failure to do so will begin the countdown. Bacteria need three essential things to multiply rapidly: Food, Moisture, and the right Temperature, leaves provide essential water, sugars, and organic compounds like plant exudates that leak from the leaf surface. These are a primary food source for many types of bacteria, you must ensure there is airflow, or that happens.
00110001001001111Oanswered grow question 8mo ago
if that's wpm, there's no way it's just 1 leaf at the top... that looks very advanced, so the entire tent would be covered by it. Throw it all out.
This looks like more like a troll account and question.
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Organomananswered grow question 8mo ago
Does not look like mites at all, but it does look like white powdery mildew, although a few more pictures would have helped rather than just one zoomed in image.
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cangrowzanswered grow question 8mo ago
Hey Kruqkruq, that looks rather unusual for edema, as they usually start as small blisters on the underside of the leaf. Unfortunately, what’s in the picture looks a lot like powdery mildew, or – if the spots look more like tiny punctures – a massive spider mite infestation. Do a quick check:
1. Wipe test: Can you easily wipe away the white coating with your finger? Then it’s mildew. Check your exhaust and humidity (lower the RH!).
2. Underside of the leaf: Take a close look under the leaf. Do you see tiny dots crawling or fine webs? Then it’s mites.
At this stage, you should act quickly before it gets to the buds. Good luck!
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