Spider mites. Fingers crossed no early signs spotted for a while. Check cyms regualry as these are the first to get attacked. With it so rife and with widespread resistance I am suprized many have not encountered it. Barely visible to the eye so roll my eyes when people say theyve got them. Lethal to all plant collections. Dry and hot ideal conditions and breed fast fst fast. Lay eggs after 36 hrs old! And yes meant hours! So here summers out and in, and inside icold season as heating drys air and is perfect for them.
easy to research if needed.! Have observed that many US states suffer bad. Travel by air, and all contamination methods even bees birds moths and butterflies. Even that brand new plant you just acquired. Its a big stigma in horticultural/ agricultural circles. Not an insect so insecticides are waste of money and time. Miticides and prevention measures essential. Those naughty naughty plants that some grow get plagued by them and forums a plenty worrying about their......erm.......................stock!
Also this autumn just gone, a harmful pathogen wiped out most of my Stanhopeas. Nothing else affected and preferable over spider mite thats for sure.