Lilac is prone to fungal diseases
Fungi in particular are targeting lilacs, which are susceptible in this regard: an infection threatens after a strong pruning, if the fresh wounds cannot close quickly enough or if the cutting tool has not been disinfected before use. But also a location that is too humid (perhaps with heavily compacted soil), damp weather, Heavy frost in winter or highly nitrogenous fertilization can prevent fungi from penetrating and growing favor. Brown leaves Mainly cause these pathogens:
- Lilac disease or lilac blight (Pseudomonas syringae)
- Leaf spot disease (Ascochyta syringae)
also read
- Lilac gets yellow leaves - causes and countermeasures
- Lilac has brown spots on the leaves - causes and their elimination
- Lilac is losing leaves - what helps?
With both causes, only a strong pruning deep into the healthy wood will help. Only cut with disinfected tools on a dry, frost-free and as warm as possible day.
Brown spots often come from the lilac terminator moth
the Lilac terminator moth
or lilac moth (Gracillaria syringella or Caloptilia syringella) occurs not only on lilacs, but also on other woody plants. An infestation is due to the feeding points on the leaves, which are black-brown in color and irregular. If you look closely, you should also see caterpillars in early summer. Later the leaves dry up and fall off. Fighting is primarily possible when the leaves are emerging, in which case you should spray the lilac several times with neem.Tips
If you have your Lilacs in a bucket cultivate it, you should not only prune it back above ground about every two years: the roots also need to be pruned by approx. one third. Otherwise, the plant will soon no longer have enough space in the bucket and will acknowledge this with poor growth, a lack of flowers and brown leaves.
