More recently, experts have pointed out that the cornmeal treatment was proven effective against a specific peanut-eating fungus, not rose black spot — or, indeed, any other fungal diseases.

Black spot is a serious fungal disease named after the big dark splotches that can appear on rose leaves once the plant is infected. It can only thrive in warm, rainy conditions, so it tends to ...

As the warmer and sunnier days of spring arrive, gardeners should be alert to the rise in temperature that might encourage plant diseases such as black spot, a serious threat to roses ...

Gardening expert Cathy Wiedemann has shared how gardeners can keep roses free from black spot disease, which can take over ...

While roses are a stunning addition to every garden, they can be hit by black spot disease at this time of year and that can cause them to lose their petals. Article continues below Rose black ...

but without the black blotches typical of downy mildew and black spot, Pscheidt said. It usually hits roses during the transition into summer’s driest time, particularly when dry days are ...

The symptoms of rose black spot and the tobacco mosaic virus (TMV) are shown below. dig up and destroy infected plants wash their hands after handling infected plants wash tools that have come ...

While roses are a stunning addition to every garden, they can be hit by black spot disease at this time of year and that can cause them to lose their petals. Rose black spot is a fungal disease which ...