Bougainvillea Plant Pests: Learn More About Bougainvillea Loopers

Image by Sam Fraser-Smith

By Heather Rhoades

Few plants better represent warm weather climates than the bougainvillea, with its bright bracts and lush growth. Many bougainvillea owners may find themselves at a loss when suddenly their healthy bougainvillea vine looks as though a mysterious night-time intruder has eaten away at all the leaves.

This damage is caused by bougainvillea loopers. While not deadly to the plant, their damage is unsightly. Learn how to control the bougainvillea looper caterpillar below.

What Does a Bougainvillea Looper Caterpillar Look Like?


Bougainvillea loopers are small worm-like caterpillars that are commonly called “inchworms.” They will move by bunching up their body and then stretching back out, as though they are measuring the space.

The bougainvillea looper caterpillar will be yellow, green or brown and will be found on bougainvilleas, but may also be found on plants from the same family as the bougainvillea, such as four o’clocks and amaranthus.

These bougainvillea worms are the larva of the somber carpet moth. This moth is small, only about 1 inch wide, and has brown wings.

Signs of Bougainvillea Caterpillar Damage

Normally, you will not know you have bougainvillea loopers until you see their damage. These bougainvillea plant pests are very hard to spot, as they tend to blend into the plant and will feed only at night, while hiding deep in the plant during the day.

The signs that you have bougainvillea looper caterpillar is mainly damage to the leaves. The edges of the bougainvillea leaves will look chewed on and have a scalloped edge. A heavy infestation may even result in tender shoots being eaten and even complete defoliation of the affected bougainvillea vine.

While the damage may look terrible, bougainvillea caterpillar damage will not kill a mature, healthy bougainvillea vine. It may be a threat to a very young bougainvillea plant though.

How to Control Bougainvillea Looper Caterpillars

Bougainvillea loopers have many natural predators, such as birds and omnivorous animals. Attracting these animals to your yard can help keep the bougainvillea looper caterpillar population under control.

Even with natural predators, bougainvillea loopers can sometimes multiply faster than the predators can eat. In these cases, you may want to spray the plant with a pesticide. Neem oil and bacillus thuringiensis (Bt) are effective against these bougainvillea plant pests. Not all pesticides will have an effect on bougainvillea loopers, though. Check the packaging of your chosen pesticide to see if it affects caterpillars. If it does not, then it will not be useful against the bougainvillea looper caterpillar.

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