Mandevilla Pests and Diseases

You should always be on the lookout for pests and problems with your Mandevilla and all of your plants.

This is especially true when preparing to bring your Mandevilla plant indoors for the winter.

This preparation time provides the perfect opportunity to treat effectively for the most common Mandevilla pests:

Aphids
Scale insects
Mealybugs
Red spider mites
Whiteflies


Common Mandevilla and Dipladenia Pests


Aphids typically attack plants weakened due to inadequate care or poor location.

If you find these tiny little bugs on your Mandevilla, try to getting rid of aphids with a strong spray of water. Follow this up with treatment using insecticidal soap or neem oil.

Take steps to remedy any problems in plant care or location to prevent reinfestation.





Mealybugs collecting under leaves and scale insects on Mandevilla usually show up on thirsty plants. Lack of proper watering in summertime or low humidity indoors in wintertime can attract them.

Correct problems with your watering and humidifying routines and treat with a neem oil insecticide spray.

If you see webbing on the backs of the leaves, check for an infestation of spider mites. These insects turn up when conditions are too hot for the health of the plant.

Treat with neem oil and relocate your plant to a cooler, more sheltered location.

Frequent examination of your plants will help keep these pest problems under control.

Be sure to look your plants over thoroughly every few days.

Perform a particularly thorough inspection before overwintering Mandevilla.

More on Mandevilla Winter Care

Be sure to check the undersides of leaves and examine stems and leaf axils for any sign of unwanted insects, larvae, and eggs.

Prune off diseased or infested portions of the plant. Use a strong spray of water to knock the pests off and then follow up with an appropriate treatment.

It’s always best to use the gentlest and most natural effective solution possible. This is why we recommend neem oil, an entirely natural oil very effective against:

Battling powdery mildew outbreaks
Plant Scale
Colonies of Mealybugs
Aphids
Thrips
Spider Mites
This safe, natural product is a must-have for any flower and/or veggie gardener. Buy Neem at Amazon.

In addition to insect pests, Mandevilla plants may be subject to problems such as fungus and/or yellowing, dropping leaves.

The fungus is a sign of excessive watering. It may also be a sign of inadequate ventilation.

Adjust your watering schedule and take great care not to water-log the plants.

Prune the plant to help air circulate through its leaves.

Some yellowed and dropped leaves are a natural part of the growth and life cycle of the plant.

Don’t be alarmed by this unless your plant is losing a significant amount of foliage. If this is the case, your plant may be too cold.

Move it to a warmer, more sheltered setting and/or turn up the thermostat.

Does Deer Eat Mandevilla Plants?
We’ve been asked this question: “Is Mandevilla deer resistant?”

In our research, we have found several references on the websites “stating” that Mandevilla is deer resistant.

However, the Mandevilla is not listed as a deer-resistant plant or vine in the Rutgers University New Jersey Agricultural Experiment Station deer resistant database. [source]

With the many Mandevilla colors, species, along with the many new hybrids, there probably are some varieties which are deer resistant and some which are not.

At this time we cannot offer an authoritative source to answer the question if the Mandevilla plant is deer resistant or not.

source