Evaluating the efficacy of oxalic acid control products for the management of Varroa destructor under Australian conditions

Summary

Effective and affordable control of Varroa destructor is essential for maintaining honey bee health, supporting the viability of beekeeping enterprises and sustaining pollination services in Australia. Increasing resistance to synthetic acaricides has driven interest in non-synthetic alternatives such as oxalic acid (OA). Although OA has well-established miticidal activity, its effectiveness is highly dependent on application method, environmental conditions and brood presence. In warm climates where brood is present year-round, including most Australian regions, conventional OA dribble and sublimation methods exhibit reduced efficacy and often necessitate repeated applications, thereby increasing labour and operational costs.
Sustained-release OA: glycerine formulations delivered via cellulose strips offer a potential means of extending mite exposure across multiple brood cycles. Despite the widespread informal use of OA by beekeepers internationally, the purity and composition of OA used in these strips, the potential effects of impurities on colony health, and their field performance under Australian conditions remain poorly characterised. Commercial products such as Aluen CAP have also not been independently evaluated in local commercial apiaries. This project will conduct replicated field trials in commercial settings to compare the efficacy of different OA strip formulations against V. destructor. Mite infestation will be monitored using repeated alcohol washes at baseline and at two-weekly intervals, with final treatment efficacy confirmed using amitraz. Secondary measures will include colony strength, brood area, queen status and honey production. The resulting data will provide robust, locally relevant evidence to support informed decision-making on effective and affordable Varroa control under Australian conditions.

Program

Honey Bee

Research Organisation

Southern Cross University

Objective Summary

The objective of this project is to determine the effectiveness of oxalic acid (OA) and glycerine strip formulations for controlling Varroa destructor under Australian conditions. It will assess the efficacy of OA strips, how long they remain efficacious and their impacts on colony heath, queen bees and honey production.