sticky, honey like substance on some leaves of lemon tree brought back indoors after being outside for summer. what is causing it. How can I treat it?
The latter are like small flattened pale-green scales attached to the leaf veins usually. They can be scraped off with a toothpick and wiggle a bit.
Take the lemon back outdoors on a callm day and thoroughly spray all the stems and foliage with a houseplant insecticide. Leave it for a few hours and take it indoors.