Imidacloprid kills arthropods by contact or by ingestion. Organisms that eat leaves or suck juices from plant vascular tissue will be killed. It does not enter plant cells. If you spray it on spider mite bodies it will kill them. However, most preparations are soil drenches. Spider mites suck juices out of individual plant cells, not out of the vascular tissue, so they are not exposed to systemic imidacloprid. Also, spider mite webbing is a barrier to contact pesticides. A wetting agent is necessary.
Thrips are outside in the landscape in metro Los Angeles. They lay eggs in leaf litter, often far from plants. This is one reason for keeping a very clean growing area. I haven't read of them laying eggs in nor on plants. There are citrus thrips in metro Phoenix but members of our society haven't seen them on our orchids.
Last edited by estación seca; 07-17-2023 at 06:46 PM..
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