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Roses can also be recognized on buds
Rose diseases: When the buds are affected
For a rose lover there is hardly anything that would be more annoying than the missing rose blossom. Months of work and loving care - and then the all-consuming, rewarding flower will stay out of it or will be very meager. There are several causes for this, behind which a fungus, a virus or insect pests can get stuck. The most common reasons for missing or crippled flowers, we have put together in this article.
Fungal diseases
Fungal diseases are very common in many roses, they usually occur due to improper care, too humid or too hot weather or an unsuitable location. Many fungal pathogens infest the leaves, but can also spread to shoots and even the flowers. Once this happens, it is usually an advanced stage of the disease.
Gray horse (Botrytis)
Gray mold (often referred to as "botrytis" after its pathogen), if it attacks roses, is for good reason also referred to as "stalk and flower rot". This disease occurs only in summers with very high humidity and is reflected in the greyish mushroom turf on leaves, buds and young shoots. In addition, these plant parts form brown, dry spots - infested buds and flowers then often appear as dried. If this disease breaks down, only a radical pruning to healthy wood helps - the buds and flowers are in any case beyond saving. Never throw the clippings on the compost, but dispose of them together with the trash. In addition, avoid over-fertilization, especially with nitrogen, as this favors a settlement with the botrytis fungus.
Powdery mildew
The powdery mildew also occurs mainly in warm and humid summers and is favored mainly by a wrong siting. An infestation is initially on the leaves, but at an advanced stage expands on the shoots and buds of the rose. Infested plant parts continue to grow, but look very deformed. Buds do not open. Again, only a strong pruning and a good ventilation of the rose help, if necessary, you should plant them to a new location. Sensitive varieties of roses can be sprayed preventively with plant tonics.
Tips
If the rose buds are initially healthy, but unusually shaped and quite thick, but ultimately only a small and crippled flower grows out of it, then an attack with thrips is often the cause. These are tiny black fringed flies that prefer to colonize healthy flowers and buds. Many flowers of a rose, but only a few can be affected.