Aphids. I find that my Kalanchoe are quite prone to them. They love the flowers. You can blast them off with water and spray with dilute rubbing alcohol. Do not expose to direct sun until the alcohol has dried. Repeat every 4-5 days.

Oh - on the rain exposure. I think it depends on your potting mix. Mine stay outside rain or shine, but I have mine in a very gritty mix because my summers are so wet. I moved them under roof, but in bright shade outdoors, when I was using a 50/50 mix of perlite and cactus & succulent soil. That stayed too wet for too long in my conditions.

Thanks! I cut off the flowers and cleaned the plants with a hose. By this afternoon there were only a few left. If they return tomorrow I'll try the diluted alcohol. I've also read about diluted neem oil. Do you have any thoughts on this?

thanks again!

Check more before you use the neem oil! I think I may have read on these forums that neem oil is toxic to Kalanchoe.

Oh, ok! Thanks. I'll check. I might be able to get away with blasting water. This morning I did another power shower.

if anyone has more insights about alcohol or neem oil, please let me know. Thanks!