Nasturtiums (Tropaeolum spp.) are edible flowering perennials suited to cultivation in USDA Hardiness Zones 9 to 11. They may be grown as annuals in all temperate regions.We link to vendors to help you find relevant produ
How to Identify and Manage Black Spot on Roses
06.06.2023 - 21:08 / gardenerspath.com / Kristine Lofgren
How to Identify and Manage Black Spot on Roses Diplocarpon rosaeIf you want to see a rose gardener cry, all you have to do is say these two words: black spot.
Sooner or later, it seems like everyone who raises roses will encounter this exasperating disease. It’s not just unattractive, it can reduce the health and vigor of your plant.
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Beyond the characteristic purple-black spots on the leaves, the fungus known as Diplocarpon rosae can also cause the foliage to drop.
In warm, humid places like Great Britain and the Pacific Northwest, it has caused a serious decline in the health of many rose gardens.
It’s so bad sometimes that certain gardeners have given up on roses.
I can’t tell you how many people I know who have pulled their roses or decided not to plant them because they don’t want to have to tangle with black spot.
It’s a no-good, very bad disease. Here’s what we’re going to talk about to help you deal with it:
Rose growers know that black spot is bad news. It’s one of the most destructive diseases out there. But it doesn’t have to ruin your day.
What Is Black Spot?Black spot is a fungal disease caused by the pathogen Diplocarpon rosae.
The fungal spores need warm temperatures and moisture to reproduce and spread. Wet spring and fall weather is just the thing, particularly when the temperatures are between 75 and 85°F.
As conditions change to become less favorable for the fungus in the summer, your plant might recover, but don’t be fooled.
The disease will come back in the fall unless you take steps to get rid of it.
Black spot probably won’t kill your plant, but it might make you want to step in and finish the job.
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