The twice-stabbed lady beetle you found is not a pest at all but a beneficial insect eating the true pest. The black leaf mold, known as sooty mold, indicates a sucking insect — in this case a soft scale. Scale insects look nothing like what we think of as insects. They spend most of their lives hiding under a tiny turtle-like shell and sucking plant sap. Then they excrete a sweet liquid called honeydew, which drips on the leaves below. Sooty mold grows on the honeydew. On your leaf underside is the actual scale insect — an oval with a white, cottony egg sack trailing behind it. This is cottony camellia scale. In winter, use a dormant oil spray. In mid-June, monitor leaves for crawlers (the scale's immature, mobile first stage), which have no protective shell. Unless there are lots of lady beetles eating the insects already, apply an insecticidal soap or summer rate of horticultural oil on all leaf surfaces. We don't recommend other pesticides, to protect beneficial insect populations. Rain will wash off the mold eventually.