Thrips?

Looks like Thrips to me, If you plants are in veg then spray em down with something that's a contact killer and repeat it every 4 days for 2 weeks to kill all the life cycles then rinse the plant off if you can. Some of the contact killers are more gentle and less resdiual is left after the treatment. so do some reserch and find something that works for you.

Hello- I have unfortunately had more experience than I care to with thrips. This does look like thrips to me. You can confirm by checking the underside of the leaves for small black dots. You can also see thrips if you look at the damaged leaves under a microscope. I remove the damaged leaves then spray with athena IPM (my fav), Neem oil, or organic insecticidal soap. Unfortunately, it is going to take multiple rounds of applications most likely. So every 2-3 days spray top and underside of leaves just before lights out. If you want to go the bug solution. I would suggest lacewings to eat the thrips and a mantis to eat the lacewings :). I have tried this too. I have had mixed success and mostly struggle with the bugs being available when I have a problem. I have read that spraying them once and then sealing inside of a bag for a few days is quick solution. But I haven't personally tried this as it seems quite severe for the plant as well. Now all of my plants get pre-treatment with IPM with each watering.

I don't have any experience with thrips. (Knock on wood!) So I can't say for sure. When I looked at it Thripswas my first thought of what it could be. The others will know for sure. I would remove the leaves heavily damaged. try to clean the tent from top to bottom. If you have extra seeds may not be a bad time to get some backups going in case things go downhill. Could do what I did when I thought I had aphids lol. I got Ladybugs. Check out my galaxy grow early flower. Even though it turned out to be practically harmless and beneficial soil mites, they just got too out of hand in population in my tent. but I freaked out not knowing exactly what they were and bought ladybugs and they loved it in my tent, and were a cool to watch. I made little homes for them with food(you have too or they will die if you don't have enough thrips, and they need some water in a paper towel too) but eventually they all died or flew away. not ideal, but way better than spraying anything but water in the plants IMO. Neem oil is okay but it stinks,and in veg perfectly awesome.but not in flower. i did end up having to spray my plants down with water to get the soil mites down and they were in flower. just want to avoid having to do that, but it can help with thrips too. If just in veg you can use a little bit of mild soap in the water. Daietemaous earth on soil in flower, and can go on leaves in veg,(dont breath in, turn fans off, then apply. Leave dry, apply after watering) will help kill them. sticky traps. i just got the fans on them right away and they dried out fine and the bud didn't have any mold issues. and never found any dead ones or anything like that in the buds. I may have smoked a ladybug turd or two but that's way better than chemical pesticides, and even organic ones like neem, although i do like neem in veg,and love neem seed meal in my soil. i think its a good preventative.it is also a great nutrient. also adding Frass to your soil will help you plants defenses, by adding Chitin. and making sure you calcium and silica uptake is good will all help the plant to be more resiliant and not as much of a target to pests. they will want to find an easier target. there are some spray out there that are mostly some mild soap mixed with some essential oils that seem okay.

The best solution is definitely Neem Oil! I’ve used it myself and I tryed everything nothing worked! Only Neem Oil. It also looks like powdery mildew. But I don’t know only from a picture. If it’s mildew remove it with some soap water very carefully leaf by leaf going from the top of the plant and working your way down. But I think it’s more likely trips. Good luck my friend and may the Neem Oil be with you 💪🏽🔥💯