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Alternative solution to powdery mildew control in cucurbits

Certis’ fungicide product, Karma (potassium hydrogen carbonate), has been granted an Extension of Authorisation for Minor Use (EAMU) to allow applications to be made on protected and indoor courgettes, cucumbers and melons for the control of powdery mildew (Sphaerotheca fuliginea and Erysiphe oronti).

Certis’ fungicide product, Karma (potassium hydrogen carbonate), has been granted an Extension of Authorisation for Minor Use (EAMU) to allow applications to be made on protected and indoor courgettes, cucumbers and melons for the control of powdery mildew (Sphaerotheca fuliginea and Erysiphe oronti).

Derek Hargreaves, independent consultant and technical officer of the Cucumber Growers Association explains the value of this to growers of these niche crops. “Cucumbers, courgettes and melons are particularly susceptible to mildew. Being short term crops, it is well-known that powdery mildew will continuously build throughout the season.

“It is common to see three crops of cucumbers grown from January to October, and by the time the third crop is planted it is not a question of if you will get powdery mildew, but rather when you will get it, so effective control measures are a necessary routine for growers.

“Although courgettes are grown as a succession crop, it is the same problem we see here. And, once powdery mildew takes hold it can be just a matter of days before widespread infection occurs,” he adds.

“The fact the Karma has been granted an EAMU for this purpose will provide growers with added security to continue to use a fungicide containing the active ingredient potassium hydrogen carbonate, which has the significant advantage of leaving no chemical residue on crops,” says Mr Hargreaves.

Karma is a fully registered plant protection product that in addition to delivering a low residue risk, also benefits from a short harvest interval as well as having a low environmental impact.

The label states that for use of Karma on indoor and protected courgettes, cucumber and melons, 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: 1941 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.