Q Where can I buy corn­meal to re­duce blackspot? A KAYE, HELSTON

Garden Answers (UK) - - Problems Solved -

A Many ‘al­ter­na­tive reme­dies’ are al­leged to pre­vent or cure blackspot on roses, but their ef­fec­tive­ness is un­proven and they may dam­age the plant. In­stead, use a tested fungi­cide, ap­plied as di­rected. Re­mem­ber that fungi­cides pre­vent fur­ther in­fec­tion so use them be­fore the dis­ease takes hold.

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