How to get rid of root mealybugs

The complete guide

Difficulty High

Frequency Low

Reproductive rate Up to 400x

Lifecycle Up to 120 days

Root mealybugs, also known as ground mealybugs, are a group of insects that attack plants by piercing their roots to feed on their sap. They resemble miniature grains of rice in shape and color. Unlike other types of mealybugs, they establish themselves solely inside the soil, making them very discreet and difficult to notice.

Tropical plants

Cacti and succulents

Orchids

Hoyas

Identifying root mealybugs

Root mealybugs look like tiny grains of rice and remain in the growing medium at all times. They are very discreet, and their symptoms can be misleading, which often means infestations become severe before they are discovered.

Early infestation

No specific symptoms

Advanced infestation

Slowed growth
Overall weakening of the plant
Discoloration or leaf drop
White substance on the inside of the pot
Presence of insects in the pot or saucer

You will need :

Dish soap
Plastic bags
Substrate

Natural predators :

Nematodes for root mealybugs

How to treat root mealybugs?

The most effective and safe strategy is to remove as many root mealybugs as possible by discarding all of the potting soil and thoroughly cleaning the roots. The treated plant can then be repotted in fresh, healthy substrate. Finally, nematodes for root mealubugs help target any remaining individuals and prevent reinfestation.

1

Remove the soil

Remove the plant from its pot over a plastic bag and carefully remove as much soil as possible. Immediately discard the infested soil.

2

Clean the roots

Rinse the roots under running lukewarm water to remove remaining soil and root mealybugs. Use your fingers to gently dislodge any remaining insects or debris.

3

Disinfect the pot

Wash the pot and saucer with hot water and dish soap. Scrub thoroughly, paying special attention to grooves and crevices.

4

Repot

Repot the plant into the disinfected pot with fresh substrate. Consider a more draining option to prevent excessive moisture.

5

Nematodes

Introduce a quarter of a nematode packet with each watering, for a total of four waterings.

A few important points

Nematodes for root mealybugs are particularly effective at treating any remaining individuals once the population has been reduced. The more thorough the initial cleaning, the higher the chances of success.
Since repotting and changing the soil causes a significant physiological shock, make sure to carry out the most complete and meticulous cleaning possible the first time.

Once the treatment is complete

Inspect the root ball regularly. If root mealybugs appear to be developing again, either the initial cleaning was insufficient or secondary sources of infestation are present. It will likely not be possible to eliminate root mealybugs without restarting the treatment.

Do I absolutely need to treat all my plants?

Root mealybugs spread quickly, and the absence of symptoms does not mean the plants are healthy. It is therefore strongly recommended to treat all plants simultaneously.

What should I do if I cannot clean the roots?

If you cannot clean the roots and replace the substrate, it will be very difficult, if not impossible, to treat root mealybugs. Consider discarding the plant or taking cuttings.