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New downy mildew control option in lettuces

Growers of protected and indoor lettuces now have the flexibility to use an alternative fungicide for the control of downy mildew (Bremia lactucae).

Growers of protected and indoor lettuces now have the flexibility to use an alternative fungicide for the control of downy mildew (Bremia lactucae).


Ian Gillott, independent vegetable consultant, explains that an Extension of Authorisation for Minor Use (EAMU) has been granted for the use of Karma (potassium hydrogen carbonate) on this important crop.

“This is good news for lettuce growers. Downy mildew is a big problem for the sector. Once the disease has taken hold it can brand entire crops unsalable, which ultimately has devastating consequences for growers.  Therefore, managing the risk of the disease is vital to ensure these adverse effects are not seen.

“Growers of fresh vegetables and salads are constantly looking for alternative ways of controlling crop pests and maintaining crop yields. Therefore, the authorisation of this EAMU for Karma to control downy mildew is very positive news,” he says.

Karma, a fully registered plant protection product, is specifically formulated to deliver a low residue risk; short harvest interval; and eradicant activity.  “For fast growing edible crops, the fact that Karma only has a one day harvest interval and has no issue surrounding maximum reside levels will resonate with growers.”
 
The label states that for use of Karma on indoor and protected lettuces, the maximum individual dose is 3kg/ha. Growers can make a maximum of eight applications per crop per year providing the maximum total dose of 24kg/ha/crop isn’t exceeded.

 
Extension of Use


This extension of the authorised use provides for the use of Karma in respect of crops and situations, other than those included on the product label. No efficacy or phytotoxicity data have been assessed and as such the ‘extension of use’, is at all times done at the user’s choosing, and the commercial risk is entirely theirs. Users must be in possession of a copy of the Extension of Authorisation Number: 1940 of 2015 for full details of product extension prior to use.

Karma® is a registered trademark of Certis Europe BV. Karma® contains potassium hydrogen carbonate. MAPP no. 16363. For more information please contact the Certis technical hotline on 0845 3730305.