One pest that is often missed is scale insects. They camo themselves as little brown bumps that really look like they're part of the plant anatomy, especially on woody plants. They "glue" themselves on with waxy material so that they don't easily come off either, sometimes even scraped with edge of your nail.
They suck so much juice that new leaves yellow, curl, dry up and die.
I once lost a culinary bay plant because I didn't realize they had scale until it was COVERED with it -- they were pretending to be brown bumps on woody parts and green bumps on younger growth.
The young green nymphs are actually mobile, then they settle and glue themselves down.
Usual method of eradication is rubbing alcohol on cotton swabs.