It is not uncommon for forsythias to be affected by the insidious Monilia peak drought or the Verticillium infection. Then act quickly.
Your forsythia (forsythia) in the garden is just a sad sight? Does it wilt away even though you actually water and fertilize the plant regularly? The shrub may then be infected by the pathogen Monilia laxa or by a Verticillium infection. Here you will learn how to recognize these diseases and what measures you can take to protect the individual plants and your garden.
Top Monilia drought: clinical picture and immediate treatment
If your forsythia suddenly withers at the tips during or after flowering, you are probably infected with the fungus Monilinia laxa. The wilted Monilia drought stretches over 20 to 40 centimeters on the branches. It captures flowers and leaves that either fall off the plant directly or remain limp.
Measures against the Monilia peak drought:
➭ In damp weather, the fungus can sometimes be recognized as a yellowish to gray coating on the branches. But don't worry, if you cut back the affected branches immediately, it promises very good chances of healing. To do this, you can cut at least 15 centimeters beyond the visible diseased area into the healthy wood. At the time of flowering, you can also use fungicides.
Dispose of the cut plant parts in the organic waste bin or residual waste. Do not throw the branches on the compost. The pathogens can hibernate there and return to your garden when using the humus.
➭ Check fruit trees in your garden for a possible infestation by Monilia laxa, which can also show up as a drought or as a fruit rot. You can recognize fruit rot by the ring-like brown discoloration of the fruit. In the case of stock fruits such as apples, these discolorations can also be shiny black and ultimately cover the entire fruit.
➭ Make sure that your forsythia is not loosely planted with a not too timid cut. In the case of single plantings, also make sure that the bushes are as far apart as possible.
Verticillium infection: clinical picture and immediate treatment
If the wilt of your forsythia does not appear on the tips, but first on older, inner parts of the plant, there may be a Verticillium infection. This dangerous disease comes from the fungi Verticillium dahliae or Verticillium albo-atrum and is a little more difficult to treat. An exact diagnosis is unfortunately only possible by laboratory examination.
Measures against a Verticillium infection:
➭ There is a test that gives you indications of a possible illness. To do this, remove the bark from an affected branch. If you notice brownish veins running along the wood, a Verticillium infection is very likely. It is best to cut the affected shrub radically immediately. Also remove any fallen leaves and once again dispose of all plant material in the residual waste or the organic waste bin.
➭ If the same symptoms reappear after pruning the forsythia, you should remove the entire forsythia to protect your garden and also replace the surrounding soil. The Verticillium infection can spread to many different plants and leads to complete death if the treatment is unsuccessful.