Hoya Flower Sap. If there are no flowers on the Hoya its possible there are sap-sucking bugs on it such as mealybugs or aphids. A sprinkle of ground cinnamon or powdered charcoal on the cut part of the plant will help prevent infections and attacks by sap-sucking pests.
Thankfully sooty mold is very easy to deal with. If you guessed that this milky sap is what earned the plants in this subfamily the name MILKweed youd be right. Hoya latifolia is an endangered epiphytic climber that is native to Singapore.
Hoyas are evergreen perennial creepers or vines that climb by twining.
Broadleaf Evergreen Growth Rate. They often grow epiphytically on trees with some growing terrestrially or occasionally in rocky areas. Simply wipe off the mold with a damp cloth. Hoya is a group of tropical plants with over 200 species.