Even with the most careful care, diseases occasionally occur in the pasture. You can find out how to recognize these and keep them he althy in this article.
What diseases can affect willows and how to treat them?
Willows can be affected by various diseases, such as Marssonina disease, willow scab, shoot tip drought, powdery mildew and rust. To treat the pasture, infected branches should be removed and biological alternatives to chemical agents should be used.
First rule out care errors
Sometimes it is difficult to distinguish symptoms of an illness from the consequences of improper husbandry. For example, if the leaves turn brown, simple measures usually help to keep the pasture he althy, even without fungicides. The Salix genus is actually considered a very resistant plant. So check first:
- whether the pasture is sunny enough.
- whether the soil is consistently moist.
- whether the soil contains enough nutrients.
- whether the roots can spread or are prevented from growing by crusted layers of soil.
- it is a seasonal phenomenon.
Common diseases
- Marssonina disease
- willow scab
- Shoot tip drought
- Powdery mildew
- Rust
Marssonina disease
Marssonina disease is caused by the fungus Marssonina salicicola. It affects pretty much all parts of the plant, with symptoms primarily appearing on the leaves. This is where necrosis occurs, which later causes the leaves to curl up and become unsightly. If the leaves dry up or fall off early, it is usually too late to stop the infestation. Be sure to cut the tree back and make sure that all infected branches are disposed of. As a preventive measure, you should collect the fallen leaves in autumn.
willow scab
A fungus also causes the disease here: Pollaccia saliciperda. It attacks leaves, shoot tips and thick branches. Leaves lose mass but remain on the tree for a noticeably long time. If the infestation is severe, the petioles turn black. A dose of potassium and phosphorus helps the tree to strengthen its defenses.
Shoot tip drought
With shoot tip drought, it is primarily the shoots that are affected. They turn dark and dry out. Ultimately, the willow will die. Prune the tree back heavily to remove the infected branches.
Powdery mildew
Powdery mildew is known for its white spots on the top of the leaves. Fortunately, it can be combated with simple home remedies. Are helpful
- Plant broths made from field horsetail or garlic
- Water-milk or water-soda solutions
- natural predators like ladybugs
Rust
Rust appears as orange spots on the leaves. These can even die. The disease often occurs in early summer.
Chemical agents for treatment?
Fungicides are strongly discouraged as they harm both the pasture and the environment. Most of the time there are organic alternatives. Inquire at your specialist retailer.