Although frangipanis are pretty hardy, there are several pests and kado unik, kado ulang tahun unik which can affect them, predominantly fungus, scale, frangipani corrosion and stem rot.
Fungus, Mold & Powdery Mildew
Leaves affected by fungus or mold could be sprayed with a copper centered fungicide and white oil solution. If you like organic solutions, try a combination of powdered milk powder and white oil or detergent.
Keeping plants well nourished aids in preventing fungal infections. Potash is specially good for improving disease resistance in frangipanis.
Leaves affected by hemispherical scale dark to light dark brown bumps that are glossy, smooth and hemispherical. Leaves may possess a black sooty coating.
Scale could be treated by spraying with white oil in spring to early summer. 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 which includes daisies, zinnias, and zucchini.
There is a new disease attacking frangipanis in known as frangipani rust. It is most noticeable in late summertime and early autumn. An orange to yellow powdery substance (in fact pustules) appears on the underside of leaves. They rupture and spread spores which pass the disease to other plants nearby. The top sides of the leaves are brownish and discoloured. Severe infections could cause the leaves to drop prematurely and will lead to the death of small plants, however larger trees appear to suffer no side effects (aside from leaf drop).
To control frangipani rust use 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 recently some frangipani trees have built up 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 disorder called stem rot' and it's quite common in trees that have been stressed by frosts, drought, lack of sunlight or just the usual age.
The easiest method to keep it under control is to basically prune off any diseased development, but when you do, it's important to be sure you cut it right back to good, healthy tissue.
Dying tip growth is commonly referred to as black tip dieback. Some newer deciduous cultivars and evergreen frangipanis are particularly prone to the disease.
Commercial frangipani growers suggest the problem is worse in areas where fruit-spotting bug and beetle activity is certainly high. The reason being any insect attack on the tip of the plant predisposes it to a second dieback infection.
Affected plants typically reshoot under the damaged portion of stem. If plant life appear unsightly or you are concerned that the rot is certainly advancing down the stem, use sharp pruners to cut back to clean tissue. Be sure to use hot water or household disinfectant to clean pruners between cuts so as to minimise potential disease transfer.