Zespri has three ALT-aligned projects investigating biological control options, and one which is focused on reducing chemical input by optimising application dosage and timing.

Zespri aligned three discovery projects investigating biological control solutions for the kiwifruit bacterial disease Pseudomonas syringae pv. actinidiae (Psa) with the aim of providing alternative tools to kiwifruit growers for more sustainable Psa management in the future. Having a range of tools with different mode of actions not only reduces reliance to copper and bactericide but also forms part of the industry resistance management strategy.

All three projects have been completed. One of the projects led by University of Waikato identified some marine bioactives in the organic acid family with inhibitory activity against Psa. The outcome and background methodology of this project have been shared with ALT, which led to a broader pan-sector project funded by ALT. The new project screened a range of commercially available acids against common pathogens in the New Zealand horticulture industry.

The other two biological options include a phage- and a bacteria-based active. Zespri continues to pursue these internally.