post from friend: I live in zone 10b, and my mexican lime tree is in a container and is about 5 years old. In the past 10 days, I noticed some black slime like material. Upon closer inspection, the slime is due to decomposition of flowers. I have never seen anything like this before!
Some of the leaves near the slime spots have holes munched into them, which leads me to believe this might be a pest problem?
I trimmed the places where I couldn't clean out the black slime flowers, and sprayed the tree with BTU, but I'm not sure what kind of pest this is. The same pest also appears to be trying to move into a jade succulent that is adjacent to the lime planter. If anyone has experienced something similar before and knows what this problem may be, please let me know!
Other info of note: normally watered once a week with a hose, but rainy season started here and it has been raining pretty regularly since Thanksgiving. I fertilize it with a citrus fertilizer as directed. Pot is a half-wine barrel with drainage holes drilled into the bottom. It gets part sun (I know full sun would be more ideal, but we had to move 2 years ago and our new patio unfortunately doesn't get much sun...we have it in the sunniest spot).