Ladybirds, cryptolaemus used to target problem mealybugs in NT frangipani trees

A tiny insect is the key to a huge problem in the Territory and is set to save some of the Top End’s prettiest trees. Find out how.

Entomologist Sachinthi Kithulgoda releases mealybug ladybirds (cryptolaemus) into a frangipani tree to target problematic mealybugs.

Native ladybirds are being used as a tool to combat mealybugs and protect the Top End’s frangipani, hibiscus, and papaya trees.

Principal entomologist Brian Thistleton said the red and black ladybirds had been introduced globally and earned a reputation as the “mealybug destroyer” internationally.

Mr Thistleton released multiple adult mealybug ladybirds and their larvae into a frangipani tree on Friday.

Principal Entomologist Brian Thistleton releases mealybug ladybirds (cryptolaemus) into a frangipani tree to target problematic mealybugs.

The release comes as part of an NT Government and Darwin City Council initiative to manage mealybug populations in Darwin suburbs.

Mr Thistleton and fellow entomologist Sachinthi Kithulgoda expect introducing the ladybird to infested areas will reduce mealybug numbers and their damage.

Ms Kithulgoda said introducing the ladybirds instead of using chemical sprays offered a long-term solution to a persistent parasite problem.

Principal Entomologist Brian Thistleton releases mealybug ladybird (cryptolaemus) larvae into a frangipani tree to target problematic mealybugs.

She said she noticed the mealybugs had “smashed” the frangipanis in her own garden and decided to try introducing her ladybird population to the garden.

“Anyone can purchase (ladybirds or ladybird larvae) online and we want to educate them,” she said.

“The cryptolaemus larvae look like a mealybug, so then (people) might spray, they might be trying to kill.

“But if they get to know that this is the larval stage and they are smashing them, then it’s good, they will keep their eye on it … and they will be really happy when they see the adult.”