Control scale on mandevilla

I have just received your question Smara Fetila as follows: “Can someone help me please??? What is this? It’s killing my mandevilla, this pest is not mobile, it’s clinging to the plant and it’s at every knot of leaves, and spreading pretty quickly”. Smara Fetila also included a photo of her mandevilla

Scale On Mandevilla
Scale On Mandevilla

Mandevilla Bug Infestations And Cures

They are not highly susceptible to diseases, but insects may attack them. There are four common types of insects affecting Mandevilla are the following

  • Mealybugs
  • Scale
  • Spider mites
  • Whiteflies
Mandevilla Boliviensis With Mealy Bugs
Mandevilla Boliviensis With Mealybugs

How to recognize the scale on the mandevilla

The first sign of scale: The scales appear to be bumps or irregularly growing on the leaves/stems and surrounding area of mandevilla. The bumps on the leaves and stems can vary in size and color due to the stage of development. When they start to feed mandevilla or dipladenia, the scales remain motionless and difficult to treat.

Scale usually appear in dry places, not wet. Some scale produce honeydew, like mealybugs, but insecticidal soaps will rarely take them out due to their hard coverings.


Scale harm to mandevilla

The scales use their mouths like tubes to draw resin from the inside of the stem and leaves. They release a sticky, mold-like substance that forms black mold.

Yellowing, early deciduous and slow growth are all the results of scale damage.

Prevention of scale on mandevilla

In their crawling stage, scales are removed using horticultural oil. Heavily infected stems are cut off to prevent the insects from spreading to healthy portions of the plant.

You can try:

  • You can scrape them off with your fingernail which can be a very tedious task.
  • Try some horticultural oil on a Q-tip and dab on individual adult scale. The oil will kill scale by suffocation.

Neem oil can be used weekly. Use 1 oz. (2Tbsp) of Neem Oil , 1 1/2 teaspoon of dishwashing detergent to 1 gallon of water. Persistent spraying is important.

A stronger option is Orthene (a systemic pesticide). It renders the whole plant as poisonous and insects die after feeding on it. It smells bad and should be used with extreme caution. (Never indoors). There are several systemic houseplant insect controls (B0nide, Bayer)available that can be used indoors for potted houseplants.

For all chemical products-make sure you follow manufacturers direction for safe and effective usage.

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