Because the room was getting way to hot with all the lights on and no aircon, I had to switch to external air. I switched two days after I started flowering cycle. Plants are now 5 days into flowering light cycle. Its ebb and flow, rockwool, SOG. I think the temperature switch was pretty extreme. A difference of about 15 degree celsius and co2 difference of 1000ppm.
Pretty much the day after switching to external air some plants are looking really sick and nearly all show more or less sings of the same issue on their leaves. The cubes are still very moist after two days. Normally I had to give them water every day. (Maybe the cubes are still so wet because I dont need to use the dehumidifier with the external air now). On the photo you can see the worst cases. It is like the most weak plants show the worst signs. I need to find out what it is, so I know if it spreads or get worse.
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Can you tell me what is that? Is it a fungus, is it some pest or some nutrient problems (maybe some sort of nutrient burn from switching to low metabolism) or maybe it was just to hot before? Maybe the there was too much nutrients pulled in the leaves when it was hot because of high metabolism and when switching temps to cool temperatures this amount is now toxic to the plants.
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I need to decide what to do, is it an option to put the plants back into vegetative life cycle until they recovered? Or should I leave them into flowering cycle (already 5 days). I dont want to mess up the yield. What are my options now to still get a good yield? What happens to plants in flower which are stressed, will the flower period be slowed down and prolong or is there a fixed amount of time in flower available and all the time the plant is sick in that time is lost? What happens normally when you transition to flower, are there any visible signs? Because to me it seems these plants are doing nothing now, maybe just regressing and waiting for a pest to come
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Also after switching to external air I am already finding small flies in my grow rooms, it also seems something ate some holes in the leaves. Is there some sort of pre filter needed that I need to put on the air intakes or how can I make sure I dont pull in the pests with the air? Is it normal to find insects in the room. Do I need to act already, I dont want to get a pest problem also.