kalanchoe with unknown pest

Hello, this is a pest that invaded my kalanchoe after I had overwatered it for a few weeks. I am not completely sure what is it, though I narrowed it down to gnats or scale bugs. I stopped watering the plant, pruned most of the branches, I use insecticide (mostly consisting of soap) but they keep on appearing.

I keep the flower in a mostly dark, hot (25 C) room. Any tips how to dix it and care properly welcomed!

Thank you


If the potting soil was too wet for a while, then it might be fungus gnats, but they don't really look like that, although a magnifying glass would be useful for you to use. Image and information on managing fungus gnats here https://www.almanac.com/pest/fungus-gnats

It might just be aphids though, so using a proper insecticide that treats for those might be more effective, particularly a systemic one. I am curious as to why you are keeping this plant 'mostly in the dark' though - those sorts of conditions do not make for healthy plants.


Further to your comment: first, direct sunlight is not the same thing as bright daylight or even just daylight. Most (though not all) indoor plants do not appreciate hot sunlight through a window, but may tolerate some sunlight in winter; otherwise, the general rule is to give them bright or medium daylight, depending on the plant and its requirements. In the case of Kalanchoe blossfeldiana, it does appreciate some sunlight, particularly in winter, see here https://www.thespruce.com/growing-kalanchoe-plants-1902982.

In respect of the insects present on the plant, they do not look like scale insects, but, as I said, might be aphids or fungus gnats. Scale insects are usually affixed to the plant and don't move, although the 'crawlers' (baby scale) look different and do move, but they don't fly. Which insecticide you can use depends on what's available where you live - I'm in the UK, so what's here might not be something that's on sale where you are. That said, most insecticides do treat for aphids as a minimum, but all should carry a list of precisely what they do treat usually on the exterior packaging - the main difference is between systemic or contact. The latter only treats what's on the plant when you spray (like a home made soap spray does) whereas a systemic gets into the sap stream of the plant and keeps the bugs off for up to two weeks.

  • I read somewhre that the plant shouldnt be exposed to direct sunlight. How can I tell the differense between gnats and scales, and what would be the proper insecticide for aphids – deckoff Dec 7 '19 at 12:05
  • See updated answer – Bamboo Dec 7 '19 at 13:16
  • Thank you for updating yur answer – deckoff Dec 8 '19 at 15:35

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.