The light brown apple moth, a native of Australia and New Zealand, has been widely regarded as a potentially serious global threat to horticulture and agriculture. The potential for biological control of this pest depends on the identification and efficacy of natural enemies. Classical biological control programmes aimed at the LBAM have been under way primarily in North America and Europe, with the release of several parasitoids from Australia and New Zealand. Augmentative biological control strategies involve mass-rearing and release of natural enemies, particularly egg parasitoids, have also been used in New Zealand, the United States, and Australia.

Indigenous parasitoids

Studies indicate that native parasitoids in the invaded regions can potentially suppress LBAM populations. Indigenous species can possess specific adaptations to the local environment, climate, and host population, making them better suited to provide natural control. Several indigenous parasitoids have shown promising results in managing LBAM populations:

Encarsia pergandiella: This parasitoid is indigenous to North America and attacks LBAM eggs. Studies indicate that it has the potential to suppress LBAM populations and can establish successfully in new environments.

Diachasmimorpha longicaudata: This indigenous parasitoid is widespread throughout the Americas. It attacks the immature stages of LBAM and has been found to cause significant levels of parasitism in some regions.

Anagyrus pseudococci: This indigenous parasitoid is commonly found in tropical and subtropical regions, including parts of the United States and South America. It targets various soft scale insects and has shown potential in managing LBAM as well.

Utilizing indigenous parasitoids:

Combining the release of indigenous parasitoids with other control measures, such as cultural practices, chemical control, and mating disruption, can contribute to an integrated pest management (IPM) strategy for LBAM. Integrating indigenous natural enemies can enhance the effectiveness of biological control programmes, reduce reliance on synthetic pesticides, and promote biodiversity and ecosystem health.

It's crucial to conduct thorough studies and risk assessments before implementing any biological control strategies. The potential impact on non-target insects, including native beneficial species, must be carefully considered. Researchers, entomologists, and regulatory authorities work together to evaluate the suitability of indigenous parasitoids for controlling invasive species and develop science-based biological control programmes that minimize ecological risks.