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What are those long oval yellow insects?


I’m fighting with those for literally years. I spend a lot of time treating my plants to prevent bugs. I spray them with 1:4 surgical spirit/water ratio (didn’t seem effective), now with child safe insecticide every time I see them, and with neem oil monthly. No effect at all. This spring I repotted all my plants, and they have got the same insecticide treatment, shower, all soil off, bare roots, to make sure they can’t hide anywhere. Haven’t bought new plants since to make sure they are sterile. They aren’t. To figure out another treatment, I finally have to figure out what are those. I checked the common houseplant pests, and yellow aphids are the closest, but they aren’t having black legs. They are both on the underside, and upper side of the leaves. From nowhere 5-6 up to 1mm long ones appear in a week. They definitely suck out the water from the plants, because they stop growing, leaves drying out, and I just can’t water them enough. Visible damages look like this:

As you can see they really like calatheas, usually leaving dracaenas, yuccas alone. They also really like pepperomias, and heavily attacked a strelitzia Reginae.

any help would be much appreciated

Posts

  • BobTheGardenerBobTheGardener Posts: 11,385
    A trowel in the hand is worth a thousand lost under a bush.
  • ObelixxObelixx Posts: 30,090
    Vendée - 20kms from Atlantic coast.
    "The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
    Plato
  • Not happy based on what I’m reading about them, but at least I know who they are. Thanks!
  • I’m reading about biological treatment for them with a predator amblyseius cucumeris. Anyone has any experience with that on houseplants? What happens with them once there are no more thrips? Do they start eating the plant, or just die because nothing to eat?
  • BobTheGardenerBobTheGardener Posts: 11,385
    edited July 2021
    I've used amblyseius species predatory mites on indoor spider mite infestations with good results.  I believe they can feed on pollen once the thrips are all gone, so may still be around for a while to protect against more thrips coming in from outdoors, if you have flowers in bloom.

    A trowel in the hand is worth a thousand lost under a bush.
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