Additional research to determine the efficacy of Ambitious for controlling Psa on mature Hayward vines is now available on the R&D section of the KVH website.

Ambitious currently holds a limited label claim for the control of Psa in kiwifruit. An application to ACVM for a full label claim will be made this season. Work is still needed to better understand the mode of action of this product.

The efficacy of Ambitious 10SL on mature Hayward Vines for controlling Pseudomonas syringae actinidiae, by Fruitfed Supplies
Trials testing the efficacy of Ambitious for controlling Psa on mature Hayward vines showed Ambitious was effective in reducing the severity of leaf spotting and performed similarly to Actigard. Ambitious did not appear to show any efficacy on reducing the levels of bud rot and bud loss.

• Click here for the report.

Ambitious 10SL efficacy on Psa disease on Hayward kiwifruit 2014-15, by HortEvaluation
Trials at two high inoculum sites in the Bay of Plenty showed application of Ambitious mid-season (between budbreak and flowering) significantly reduced Psa leaf spot on mature Hayward kiwifruit vines. No significant differences in percentage flowers retained, fruit set or reject fruit type were observed between trial and control plots.

• Click here for the report.