Powdery mildew on roses
Rose and powdery mildew
L’ powdery mildew è a fungal disease that affects many species including the rose. The powdery shape of this mushroom makes it characteristic and easily recognizable, so much so that it deserves the nickname of mal bianco. L’ powdery mildew in fact when it develops on the plants covers the leaves with a powdery white patina and the più sometimes it develops quickly, quickly and intensely. Known by the scientific name of Oidium, mal bianco is caused by a fungus, Sphaerotheca pannosa, and in the rose varietyà specifies that it causes the fungus è the var. rosae.
When powdery mildew appears
Powdery mildew infestations occur from spring to autumn and there are climatic conditions that intensely favor the development of this fungus. A hot, humid climate with frequent rains è the right mix, the fuse to start a massive powdery mildew infestation. Once the infestation has started, the disease spreads quickly and quickly and only a timely intervention can be severe; limit the damage that, once the infestation has started, will still be quite evident.
Where powdery mildew settles
L’ powdery mildew of the rose begins its infestation from the più parts; young of the plant, on the shoots and on the più leaves; keep, but in a short time it also expands to the rest of the plant, spreading to every part of the shrub. The white powder that can also be seen with the naked eye è only the più part; surface of the fungus, which settles through filaments in the tissues of the plant. Settling in the powdery mildew affects the plant tissues from which the plant draws its food, thus weakening it; the plant and causing it to slowly deteriorate. The spores of the powdery mildew invade the leaves, destroying them and è for this reason that the brown spots characteristic of the infestation of white sickness appear on the leaves.
How to fight powdery mildew
L’ powdery mildew è an aggressive and fast fungus, capable of spreading very quickly on the plant but not only. The ill white è a disease that within a few weeks &became serious; able to infest also the plants that are found in the vicinity; of those already 26-agrave; haunted. In hot and humid conditions; high, the fungus reproduces at very high rates, managing to produce spores which, carried by the wind, end up on other roses where they give life to a new infestation, Il mal bianco è therefore a disease that must be fought constantly if you want to be able to control it, becauseé the speedà with which this fungus infests plants and spreads è very high. Throughout the summer and possibly also as a preventive measure, before the powdery mildew occurs in substantial form, è well perform treatments. From April-May onwards è therefore it is advisable to start the fungicidal treatments and repeat them every 10-15 days to control the fungus. There are numerous products suitable for fighting white sickness and these are mainly sulfur-based preparations or systemic fungicides. For their purchase, we recommend that you contact a specialized nursery or garden center where you will find all the necessary material.