I have a year old plumeria cutting that had tiny black thin bugs all over the leaves? They are not effected by insecticide? Can yo
u help? pictures
Certified GKH Gardening Expert
THRIPS!!! Go ahead and burn the house down... Ha ha!
In all seriousness, though, these can be a real problem. They do not respond well to many pesticides, and even seem to thrive once the pesticides destroy the plants further.
There is something that you can do though. I don't like recommending products or brands, but in this case there is something that will be very effective that I use as well.
This stuff is called FoxFarm: Force of Nature Miticide.
Not only does it kill thrips, but most any infestation including fungal and viral. It comes in a ready to use spray, or a concentrate.
Thrips can be beneficial when outdoors, but they have no place indoors or on container plants where they are left unchecked. This article will offer more information: https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm