Organic status granted for new fungicide designed to aid apple scab control

A new fungicide for controlling apple scab (Venturia inaequalis) has been granted organic status.

Karma was a contact fungicide with preventative and useful curative control, said Certis technical officer for speciality crops Alan Horgan. The product was launched this March.

"The organic approval of this product is great news for growers and makes sense, as the active is approved as a food-grade additive and therefore has no MRL requirements."

The products contains potassium hydrogen carbonate and incorporates ‘wetters and stickers’ to improve coverage and rainfastness, he said.

"It has a multi-site mode of action, which inhibits the chance of any resistance problems developing. It inhibits mycelia growth and causes the total collapse of spores through a combination of dehydration, pH and specific bicarbonate/carbonate ion effects."

Horgan said to maximise Karma’s efficacy, growers should use the product during periods of leaf wetness, while avoiding the flowering stage up to 10mm fruit stage or during the last five weeks before anticipated harvest.

"Karma should be applied in at least 400 litres of water per hectare to achieve a thorough coverage of the crop," he said.

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