Why is My Mandevilla Plant dying (with Solution)

Why is My Mandevilla Plant dying (with Solution)

Mandevilla plant includes both tropical and subtropical species. A Mandevilla is also referred to as a rock trumpet. It does very well in the role of a houseplant.

Because it can be grown in hanging baskets, Mandevilla is an excellent choice for use as an interior plant. The Mandevilla blooms have an attractive and colorful appearance.

Are your Mandevilla plants showing some issues? What if it starts showing signals that it’s dying? Any inexperienced gardener will feel panicked.

mandevilla plant dying

Well in this post you will get answers to all your questions. After reading this post you will understand the problem of your Mandevilla plant and find a proper solution.

So, Let’s get started…


Why is the Mandevilla plant dying

Is your Mandevilla plant experiencing any kind of distress? There are a variety of reasons why the Mandevilla plant might show signs of dying.

Mandevilla often dies as a result of a lack of nutrients, poor drainage, or an infestation of pests. Aphids and bacteria that cause southern blight are other potential threats to the plant’s health. Mandevilla plants are also susceptible to anthracnose and powdery mildew, both of which are common plant diseases.

Let’s take a look at each of the issues and talk about how to resolve them.


Mandevilla Plant Common Problems

Here is a quick table,

Mandevilla ProblemsCauseSolution
Rapid yellowing or browning of leavesFusarium rotSpray fungicide
Foliage wiltBotrytis blightNeem oil or Copper salts
Leaf spotFungus and Bacteriacopper-based spray
Slow dyingBacterialno treatment available
yellowing and browning of the lower leavesSouthern wiltno treatment available

Read every problem in detail for better understanding.

Foliage wilt

Wilting of the leaves and the development of brown spots into the green leaves, are usually caused because of Botrytis blight also known as grey mold. This pest may enclose the buds and leaves and can spread decaying along stems and into the roots of the plant.

Plants that are just beginning to show symptoms of botrytis blight may benefit from treatment with neem oil or copper salts. The spores of the fungal disease may be dried out by pruning the vine and improving the air circulation in the area. 

Water directly in the base of the plant to avoid any fungal disease.

Yellow and browning of leaves

Another kind of fungal disease that may provide significant challenges for Mandevilla is known as fusarium rot. Once it has established itself, it is extremely difficult to eradicate, therefore it is important to keep an eye out for early indicators such as rapid yellowing or browning of leaves that are confined to certain portions of the vine. 

Fusarium fungus bodies will quickly block up the plant’s transport tissues if it is allowed to continue growing in its current state. As soon as you see symptoms, you should spray your plant with a fungicide that has a wide range of activity, such as propiconazole, myclobutanil, or triadimefon.

Leaf spots

Spots on leaves are caused by a wide range of fungus and bacteria that feed on the tissues of the leaves. The dots on the leaf can be brown or black, and there may or may not be a yellow circle surrounding the damaged regions. There is a possibility that some spots can expand fast until they cover the whole infected leaf, causing the leaf to disappear and fall off.

Before treating leaf spots, it is usually better to get a positive diagnosis of the cause, but if time is limited, you may try using a copper-based spray. These sprays are typically effective against both fungus and bacteria. Neem oil is considered to be one of the most effective remedies for leaf spots caused by fungi.

Slow dying

This caused due to the bacterial “pathogen Agrobacterium tumefaciens”, which is responsible for the development of crown galls, which appear as inflated tissue growths surrounding the base of the vine. 

The growth of the galls will eventually restrict the passage of fluids and nutrients away from the roots of your Mandevilla plant, which will result in the gradual decline of the plant. 

It’s possible that your plant has crown gall if it has multiple big growths that look like knobs at the base of the plant and reach all the way into the roots. There is no treatment available; in order to stop the illness from spreading, you must eliminate these plants quickly.

Southern wilt

The bacterial illness known as southern wilt, which is sometimes known as southern blight, is an uncommon but destructive condition that may have its genesis in greenhouses. As the illness progresses up the plant’s stem, the signs include yellowing and browning of the lower leaves, followed by the falling off of those leaves. 

There is no treatment available, thus infected plants will expire. If you think a plant has southern wilt, you should get rid of it so you don’t risk an infection spreading across your landscape.

Cause of yellowing Mandevilla plants

red flower

The older leaves of a Mandevilla plant become yellow and eventually fall off. This is an entirely natural process that occurs with many different types of vines.

It is quite normal for the lower leaves of the plant to become yellow over time as the plant matures. Because the plant will produce new foliage, you should relax and take pleasure in the newly grown foliage.

Let’s take a look at some of the other potential causes of the yellowing of the leaves.

Lack of Nutrient

  • It is possible for Mandevilla plants to have nutrient insufficiency if the soil is of low quality or if the pH levels in the soil are too high. They do well on soils that have a pH of 7.0 or above.
  • Conduct a pH test on the soil, and then care for your plant based on the results. There are two distinct deficiencies that might appear in Mandevilla plants if they are not properly cared for.
  • lack of Iron: If the soil does not have enough iron, the younger leaves will turn yellow first, and then the older leaves will surely follow.
  • If the plant is deficient in Zinc, Manganese, or Nitrogen, the oldest leaves on the plant will turn yellow first, followed by the leaves on the younger plants.

Poor Drainage

Poor drainage of the soil is very damaging to the plants. You need to make sure that the potting mix you use has enough drainage.

Poor drainage creates circumstances of waterlogging, which leads to the rotting of root systems. Roots that have become rotten are unable to absorb water or nutrients.

This results in the leaves of the Mandevilla becoming a yellowish color. Use a pot that has a hole in the bottom for drainage to avoid this problem.

Spider mites

A Mandevilla plant may get infested with spider mites. The presence of the web, which may be observed on the leaves, is the first indication of their infection.

The human eye is unable to detect the presence of these unwanted guests. The leaves will first become a golden color, then dry out, and finally, fall off.

Neem oil, when applied directly, is an effective treatment for removing these pests.

Learn how to get rid of spider mites in detail.

Harmful Insects

If Mandevilla is being plagued by pests like mealybugs, scales, red spider mites, or whiteflies, their leaves may become yellow as a result. The undersides of the leaves are often where these insects make their homes. 

They do this by chewing holes in the leaves and then secreting substances that may promote the development of fungi. The yellowing of the leaves is a sign to investigate whether insects are to blame. If they are, you may help get rid of the issue by using an organic insecticidal soap or a pesticide that is safe for Mandevilla.

Aphids on Mandevilla plants

Pest infestation is the most common cause of curled or twisted leaves. Boron deficiency may potentially be a factor, although it’s quite uncommon.

Aphids are the most likely culprit if you see curled leaves on your Mandevilla. Find any leaves that have been deformed by the wind.

If you see them, use a pesticide or Neem oil to kill them. You don’t want the sick plant to spread to other plants, so isolate it. Learn 7 effective methods to get rid of Aphids from the plant.

Powdery mildew on Mandeviila plant

Powdery mildew is a kind of fungal disease that looks like white dust, it spreads on the foliage of the plant. They spread themselves by the wind and begin to thrive when there is sufficient humidity; however, they do not specifically need wetness.

Because it looks like a powdery growth on both sides of the leaves, this condition is referred to as “powdery growth.” This illness is quite straightforward to identify.

To avoid the plant from experiencing any further decline, it is important to perform selective pruning on the thick growth of its foliage and to remove any injured or dead leaves. If the illness is serious, you should apply horticultural oil liberally all over the leaves that are infected.

Learn 7 effective methods to prevent powdery mildew from plants.

Finally words

The reason why your Mandevilla plant is suffering and dying is due to the fact that you are failing to provide the level of care that it is used to receiving. The plant must be exposed to a lot of sunlight and shouldn’t have too much water applied to it. Make sure the soil is completely dry before you water it again, and after each time you water it, never leave any standing water in the pot. But, don’t here is the guide on how to care for the Mandevilla plant.