Zorvec™ active application advice for 2024
October 2024 Statement
Corteva are aware that a sample submitted to JHI through the Fight Against Blight (F.A.B) monitoring programme has been confirmed as EU46 which has been linked to OSBPI resistance. We understand that the trial site has been burned down, and that the tubers will be disposed of responsibly. This management, along with the remote location of the site from other potato growers and the late occurrence of the infection, reduces risk of further spread. No further examples of EU46 have emerged in the 1500+ samples submitted under FAB, nor been reported in Corteva’s own trial sites, where our latest guidance has been followed. Indeed there have been no reports of less than expected efficacy from users in 2024. Corteva and our industry partners will continue to monitor the situation, reviewing best practice advice accordingly and will update users ahead of next season. With the EU46 strain now having been reported in GB, it is even more important that those utilising Zorvec™ active containing products in their blight programme follow the latest best practice advice.
Products containing Zorvec™ active deliver highly effective disease control against potato Late Blight.
Zorvec remains a highly effective product for the control of Late Blight.
Corteva have a robust monitoring programme in place for the UK & Ireland, but no breakdown of efficacy to Zorvec in the field has been found.
Mancozeb remains registered in the UK and is a useful anti-resistance tank-mix partner.
Corteva strongly advise following the 2024 application advice when recommending and applying Zorvec products.
Corteva potato fungicides containing Zorvec™ active registered for use in the UK: Zorvec Endavia, Zorvec Entecta
View a printable A4 version of Corteva's Zorvec active application advice here.
Best practice application advice for 2024
· Apply Zorvec products in strict alternation with effective chemistry of a different mode of action, other than CAA (benthiavalicarb, mandipropamid, dimethomorph)
· The post-Zorvec application interval to the following non-Zorvec containing spray should not exceed 7 days.
· In curative situations (disease evident or confirmed in local area) Zorvec co-formulations should be applied in tank-mix with a partner fungicide containing a curative active ingredient e.g. cymoxanil or propamocarb.
· Sprays containing Zorvec should not exceed 20% of the total number of sprays applied to a crop.
· 2 sprays per crop if the expected programme is less than 15 sprays.
· A single crop should not receive more than 3 spays containing Zorvec products.
· Whilst still available, tank-mixing Zorvec products with mancozeb is recommended.
Additional for seed crops & home saved seed
· Zorvec applications must always be applied with a full rate of a curative fungicide e.g. cymoxanil.
· A single crop should not receive more than 2 sprays containing Zorvec products and these 2 sprays should not exceed 20% of the total late blight programme.
USE PLANT PROTECTION PRODUCTS SAFELY. Always read the label and product information before use. For further information including warning phrases and symbols refer to label.
© 2024 Corteva.