Rose Diseases
Roses are relatively quite hardy compared to most flowering plants, however as they can be among your most prized plants you still do need to pay them attention if you’re to keep your roses as healthy as possible. I will describe below the most common rose diseases and their best controls.
Prevention Is Better Than Cure
There’s a reason why we remember old sayings; it’s because they’re usually true and this is no exception. Unfortunately most rose diseases can’t be cured entirely; at best you can halt their progress. So let’s look in depth at prevention
Location
You can prevent most problems by preventing the on set of damp and fungus. Locate your rose where it will get plenty of sunshine, minimum six hours per day and prune it to provide an open center for adequate air circulation. This is especially the case with climbing roses, don’t jam then against a wall or surface. The more air circulation the better. Also take into account how you water your roses; they should only need watering once a week so in most climates you shouldn’t have to water them at all. Over watering can again cause damp and in turn disease. If you do water, do so only at the base and leave the leaves dry.
Recognition
Vigilance is your watchword, check your roses as often as possible, daily if you can, this should be a pleasure rather than a chore, the more time I spend with my roses the better. You’re simply looking for things out of the ordinary, there are far too many diseases to list every single one here but here’s a list of the, ‘most wanted’.
Black Spot; as the name suggests, small black spots with a yellowy outer edge develop on the upper side of the leaf resulting in the whole leaf turning yellow and dying. Most common in humid areas, a fungus whose spores develop in water and then live in the cane. This does unfortunately make this very hard to control. Aggressive pruning in early spring is best, basically removing as much as you dare without actually killing the plant, using a fungicide before any new growth appears. Destroy fully any infected parts totally.
Botrytis Blight, another of the rose diseases causes the failure of buds and flowers to open. Discoloration occurs making leaves and flowers yellowy brown and limp. Mainly prevalent in spring, this fungus thrives in moist, cool air. Again you will only halt its progress by removing and thoroughly destroying all infected parts
So although once your rose is infected you can’t successfully eradicate the problem entirely it can be controlled. However you can prevent so many problems by adhering to location rules and type of plant choice. Be most aware that if you don’t allow damp you help to prevent disease.
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