I brought my hibiscus in for the winter and they are sitting in a window where they have done fine in the past. This year however, I have noticed what look like brown seed pods that move up the stems and attach themselves to the underside of the leaves with a weblike substance. Then the leaves begin to curl as the plant dries up. I have tried spraying and systemic poison, but nothing seems to work on these critters. I am left with picking them off every day. I can find nothing on the Internet that even looks like them. Please help!

Thrips, of which there are >5,000 species, all identifiable by experts, but that's above my pay grade. They're common on hibiscus. Often, they over-winter as eggs and February is when many species become active. There will be lots of information online about how to control them, or at least reduce their presence to levels you can tolerate.

https://www.youtube.com/watch?...

Al