2024 Author: Gavin MacAdam | [email protected]. Last modified: 2023-12-16 13:38
Gray rot affects not only vegetables and fruits - beautiful flowers often suffer from it. Delightful roses are no exception. If suddenly a grayish fluffy bloom was noticed on the queen of flowers, it is urgent to take measures to get rid of this harmful scourge as soon as possible, otherwise it is unlikely that you will be able to admire the beautiful and bright flower garden
A few words about the disease
Gray rot of roses is especially active in winter under shelters. On the upper parts of the stems, one can notice gradually growing depressed specks of brownish color, which spread with lightning speed from top to bottom throughout the stem. Also, in the infected areas, a fluffy mycelium of a smoky gray color begins to grow. And as soon as it dries up a little, the formation of numerous tiny rounded black fruit bodies, otherwise called sclerotia, will immediately begin. If the ventilation under the shelters is insufficient, the rose bushes can be affected entirely, right down to the root collar.
In the summer, the ill-fated ailment attacks beautiful roses with sudden changes in temperature and with very heavy rainfall. Growing brown spots that do not have a border begin to appear on the leaves of flowers, and then a grayish bloom of fungal sporulation quickly forms on them. Gray rot is dangerous in that it instantly covers the nearby shoots with leaves. And as soon as the mushroom spores fall on the petals, tiny light-colored rounded specks begin to form on them, which turn brown after some time. As a result, the flowers are completely covered with a disgusting bloom and, turning yellow, quickly die off and rot.
Gray rot is very dangerous for eyepieces, since when wet weather is established, it almost always causes damage to the root necks.
The causative agent of this dangerous disease is the parasitic fungus Botrytis cinerea, which overwinters in the remains of plants. However, it can persist on the soil surface as well. This pathogen always overwinters in the form of sclerotia or mycelium - these small and rather dense black structures form on the infected parts of roses attacked by infection.
To a large extent, the development of gray rot is favored by an excess of nitrogen-containing fertilizers, humid and cool weather, as well as excessive thickening of the plantings.
How to fight
For the prevention of gray rot, it is recommended not only to regularly loosen the soil, but also periodically mulch it. The introduction of various fertilizers will also serve as a good service - manganese-containing fertilizers will be especially useful in this situation, contributing to the enhancement of oxidative processes in plants. The use of such fertilizers significantly complicates the reproduction of harmful fungi.
At the initial stage of the disease, it is important to try to quickly destroy all infected shoots, as well as create the most dry conditions for the remaining flowers. A good effect is also given by spraying the flower garden with a decoction of horsetail.
To quickly defeat gray rot, rose bushes are also sprayed with solutions of drugs such as Gamair, Euparen-multi, Alirin-B or Fitosporin-M. You can also use the Benlata solution for treatments - spraying it is repeated every four to five days, until plaque disappears completely on the roses.
And in the case of industrial cultivation of beautiful flowers, the plants are sprayed with "Fundazol" (0.2%) for preventive purposes and additionally watered with the same product under the root before covering the roses for the winter. These actions are repeated in the spring, as soon as the flowers are freed from shelters, as well as with the massive spread of the disease. In the most extreme case, the use of Bordeaux liquid is also allowed: roses are sprayed with a 1% solution once every couple of weeks.
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