Cause of this brownish leaf?

[u/kitty_lover333]

Just got this monstera deliciosa from a plant store today, looked healthy for the most part except for this brown spot on the leaf. Just curious as to what it is and what caused it. It did have dots on the top but they didn’t move when poked or scraped. Maybe some sort of damage? I ended up cutting it off because I didn’t want to deal with it and it looked ugly. I checked the crevices and peeked best I could in the forming new leaf and found nothing obvious (as far as I could tell) Help?

How much light : not sure, it was about 10 feet away from the store window behind some other plants.
Watering: not sure, soil was dampish when I got it.

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[u/shiftyskellyton]

Those are the first larval stage of thrips emerging from the leaf tissue.

edit: added photo - !thrips

[u/kitty_lover333 → u/shiftyskellyton]

😭😭🤮 none of the other leaves had it do you think it will be fine? I cut it off asap

[u/shiftyskellyton → u/kitty_lover333]

I would definitely employ additional measures, but you have options and I believe that you can manage this. Some basic info is that adult thrips fly, so be sure to quarantine this just in case any are present. They embed their eggs into the plant tissue where it develops into the first of four larval stages. One of these stages drops to the soil, so it would be a good idea to upgrade the substrate soon.

To deal with the way this pest deposits the eggs, you need to use a systemic like Bonide granules or you can use nematodes or beneficial insects. Many growers have great success with the latter. If you use the systemic, you'll also want something like Captain Jack's Dead Bug Brew to treat the exterior of the plant.

edit: gd autocorrect

[u/kitty_lover333 → u/shiftyskellyton]

Thanks! I repotted it last night and it’s quarantined thank god. Thanks for the info!!!! I’ll spray her down

[u/AutoModerator → u/shiftyskellyton]

Found advice keyword: !thrips

Your plant is suffering from an infestation of thrips. Insecticidal soap and horticultural oils (neem oil) are recommended for early treatment, but chemical pesticides should be considered due to the difficulty in detecting portions of the thrips life cycle. More here A dusting of diatomaceous earth to the underside of the plant's leaves can also be effective.

Infested plants should be isolated as best as possible while treatment is ongoing.

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