Although frangipanis are pretty hardy, there are some pests and diseases which can affect them, kado untuk sahabat fungus, level, frangipani rust and stem rot.
Leaves affected by fungus or mold can be sprayed with a copper based fungicide and white oil solution. If you prefer organic solutions, try a combination of milk powder and white essential oil or detergent.
Keeping plants well nourished helps prevent fungal infections. Potash is specially good for improving disease level of resistance in frangipanis.
Leaves affected by hemispherical level dark to light brown bumps that are glossy, easy and hemispherical. Leaves may have a black sooty coating.
Scale can be treated by spraying with white essential oil in spring to early summer months. If you like organic solutions, try encouraging natural predators to your garden, such as ladybugs, the scale eating caterpillar, and parasitic wasps. Many vegetation attract ladybugs including daisies, zinnias, and zucchini.
There is a new disease attacking frangipanis in Australia called frangipani rust. It is most noticeable in late summer and early autumn. An orange to yellow powdery substance (in fact pustules) appears on the lower of leaves. They rupture and spread spores which pass the disease to other plants close by. The upper sides of the leaves are brownish and discoloured. Severe infections may cause the leaves to drop prematurely and will lead to the death of small vegetation, however larger trees appear to suffer no ill effects (apart from leaf drop).
To control frangipani rust try using a fungicide (such as Mancozeb) in the warmer weeks to slow the development of the disease. Disposing of all fallen leaves in winter season and spraying the tree and the region beneath the tree with a fungicide may slow the reappearance of frangipani rust next season.
The good news is that lately some frangipani trees have developed a resistance to rust, so that it may be on it's way out.
Stem Rot & Black Tip Dieback
As frangipanis lose their leaves over winter season, soft, withered stems could become visible. It's a condition called stem rot' and it's quite common in trees which have been stressed by frosts, drought, insufficient sunlight or just the usual age.
The easiest method to keep it under control is to just prune off any diseased growth, but when you do, it is critical to make sure you cut it right back to good, healthy tissue.
Dying tip growth is commonly referred to as black suggestion dieback. Some newer deciduous cultivars and evergreen frangipanis are particularly prone to the disease.
Commercial frangipani growers suggest the problem is usually worse in areas where fruit-spotting bug and beetle activity is usually high. This is because any insect attack on the end of the plant predisposes it to a secondary dieback infection.
Affected plants typically reshoot under the damaged part of stem. If vegetation appear unsightly or you are concerned that the rot can be advancing down the stem, use sharp pruners to cut back to clean tissue. Be sure to use warm water or household disinfectant to clean pruners between cuts so as to minimise potential disease transfer.