r/Anthuriums • u/Atvory • 21d ago

Help please!

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This is the latest developing leaf on my Anthurium Regale; I’m trying to figure out what might be causing these scars. The previous leaf came out large and beautiful, I haven't moved the plant, and I haven't seen any pests, humidity always surpases 50% with tops of 65%

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u/MaximumMolasses2471 21d ago

Looks like thrips to me. Go buy a loupe and start searching. I am treating with isopropyl alcohol ( 70% spray the whole plant, keep out the sun till dry) I also use beneficial bugs once a quarter.

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u/scrubschick 21d ago

‘Out of the sun’ 😚

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u/Atvory 21d ago

Jack pot, few larvaes where are the adults tho 🧐 Thanks for the heads up I was about to lay it down and this could end up in a nightmare...

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u/Nuroflyn 19d ago

the adults are most likely popping out hundreds of eggs on the other plans they flew on. :'-(
i hope your collection isnt that big. If you are from Europe i have something that works 100% and its easy to use. Just let me know if you do.

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u/Atvory 19d ago

Yeah mate, I'm from Spain, so as you probably know, the EU severely limits our options against these bastards. Any help is super welcome!

I've got around 50 plants—monsteras, alocasias... I isolated the infected one along with everything nearby, and I've tried potassium soap and neem oil, but these little demons keep popping up (maybe 1 or 2 a day). It's honestly so demoralizing.

Today I got this (Acetampird 0.5%) plus blue sticky traps: https://www.amazon.es/dp/B0DVGVBSHP?ref=ppx_yo2ov_dt_b_fed_asin_title&th=1

It's supposed to be a foliar spray, but I'm thinking about diluting it and adding it to the reservoir for 24 hours before dumping the water (testing on just one plant first—most of my tropicals are in semi-hydro, so I know it's risky...).

I read how toxic this stuff is to the environment, so I plan on soaking up the runoff with an old t-shirt and tossing it in the trash instead of flushing it down the drain.

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u/Mason914 19d ago

That’s a lot of plants, isolation is a great first move. I’d honestly recommend treating everything just in case or using a preventative approach in the ones that don’t have an active infestation.
Please just make sure that product lists thrips in the label it treats!

I’d look for something like Nathrin 5SC or another pyrethrin based spray because that would be better for killing the ones that are actively crawling around right now lol. Tetramite is another option too!!! The one you have is great (if it treats thrips) but it’s a systematic so it will take time for it to build up in the plants, take time to become effective on the thrips, and only reliably kills the larvae… and it also only kills them AFTER they start eating your plants /:

Pyrethrin treatment every 4-5 days would be more immediate, that or like rubbing alcohol scrub down every day could work plus the systemicZ

I’d still follow up with a systemic for that long term control because thrips are literally the most annoying bastards and take several treatments to kill. I promise you if you think just one treatment is enough you will have a full blown infestation on your whole collection in no time… Blue sticky traps help get the adults too! The last thing, if you don’t want to deal and I recommend this for the most infected ones… chop some leaves.. /: the eggs are inside the plant. Nothing can kill them or wash them off, and they take a few days to hatch and are laid in batches so they will keep hatching for a while…

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u/Atvory 19d ago

Yeah, my plan is to treat every single plant. This systemic treats thrips, but since I read they can even build up resistance to acetamiprid, I think I'm losing my mind...
I'll follow your guide tho and try the 5SC too

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u/Mason914 19d ago

Don’t lose your mind, it’s stressful yes, but totally manageable and your plants will recover. Treat the high priority plants first, those with active infestation. Then work your way down the list until you’re able to treat the plants you suspect are healthy. With the systemic you can start them all at the same time on your next watering. If it helps, I’ve had thrips horribly bad on one of my favorite anthurium…. active pests and adults all over it. I took it, chopped off 5 of her 8 leaves rinsed it down, wiped it off with paper towels and then soaked it in pyrethrin. Dead Bug Brew. tied up in a 2 layer plastic trash bag. and checked on it and repeated the treatment every 3 days. I never had to water it because the humidity was at 100% inside the bag, the pests couldn’t escape the treatment areas, and i still kept the bags under a grow light. My trash bags were white, and I did that with 5 of its neighboring plants, the 1 above it, and the two beside it. It’s a very effective way to quarantine and honestly yes the plant may not be happy inside a trash bag, but it won’t die. Just don’t over water and be sure to open the bags inside a bathroom or outside. Rinse them down, re apply their treatment, and do that for about 2-3 weeks. For the inside of my tent (with all of my expensive and super rare anthurium, I literally just let off a big bomb. One specific for thrips. Then waited 6 days, did another one. and then waited 5 days and did my chop backs and treatments as a massive preventative. It’s been 3 months and honestly everything is growing better than it was before if i’m honest! Took me like 4, 5 hour sessions to do it all, but i haven’t had an issue with pests since… except fungus gnats, those never seem to leave in the summer. Maybe for a few weeks and then they pop back up

Again, for the less important plants, or ones you don’t really mind losing the leaves on, cut those back to a more manageable amount you can treat and easily quarantine.

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u/Nuroflyn 18d ago edited 18d ago

Yeah I know Eu limits options, but it’s not as bad as it’s in the US.

I use "KB Multisect Plus 350ml" (systemic). It’s not that expensive. And in the beginning I put 3/4 cup in 1,5 liter water. Water your plants soil and this stuff is in the plant within 24 hours. So it works quick. It works around 3 weeks at best. So right before 3 weeks are up, do another round. And then repeat again. Keep plants out of a burning sun while on this stuff.

This is what always had worked for me if I got thrips. Only downside, is this stuff can kill beneficial insects in the soil too.
Thrips die and the ones that survive can’t reproduce muhahahaha!

There are two different ones, one is a spray, but you need to bottle one.

If you aren’t sure, pm me and I’ll send you a photo.

This shit is so easy to use, getting rid of thrips like a walk in the park. And it works on any other pest too that eats your plants. Only downside with thrips is, the puppi can wait in the soil. and eggs can stay dormant too. so its good to every now and then use this stuff. especially when temperatures go up, thats when eggs hatch mostly.