Evolution has been kind to them. They remind me of the aliens in the Alien movies, virtually indestructible. Last year after placing my orchids outside I cheered because I thought I had won the fight. Then I decided to clean my plant stands and found that their fluffy egg cases were nestled out of sight in between the joints of the stands.
Needless to say that I have them again on my plants now that they are indoors. I have also observed that spraying them causes them to immediately lay eggs - basically anywhere, even on the lip of trays and plant stand joints. Another strange thing. I have never seen an intermediate stage. I always see the tiny ones or the adult ones, no sizes in between.
And if you are going to spray, do it when they are active - which is in the middle of the night and never in the day.
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