Brassica growers are being warned to keep their eyes open for ring spot.
Agronomist Martin Christopher said that the disease, which is caused by the fungus Mycosphaerella brassicola, is a particularly disfiguring one in many over-wintering crops such as sprouts and cabbages.
“Downy mildew can escalate when the weather is appropriate, as it has been already this year. White blister (Albugo candida) is also becoming much more widespread, particularly in the south east and can spoil both yield and quality of summer cauliflowers and summer sprouting broccoli,” he explained.
Christopher proposed that growers use Signum as it is a more benign material which naturally falls into the early slot when the crop can be heat stressed. “You want to avoid using aggressive fungicides which could dewax the crop,” he added.
Signum has a label recommendation in Brussels sprouts, cabbages and cauliflowers, and SOLAs for protected and outdoor leafy brassica crops grown for baby leaf production, outdoor and protected Chinese cabbage, outdoor collards including spring greens and outdoor kale.
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