How is mallow rust expressed in hollyhocks?
A fungus, the Puccinia malvearum, is responsible for the mallow rust. It leaves ugly yellow spots on the top of the leaf. On the underside of the leaves, these spots are reddish and raised, like small pustules. Mallow rust often occurs in spring. The fungus can even be in the plant overwinter.
also read
- Is the hollyhock susceptible to disease?
- Is the hollyhock hardy?
- Does the hollyhock often suffer from pests?
This is how you can prevent mallow rust
Prevent the mallow rust before your Plant hollyhocks. Choose the Location carefully. It should get as much sun as possible and not be too humid. Plant the hollyhocks at a sufficiently large distance from the neighboring plant, it should be approx. 40 cm.
Also the right one care contributes to prevention. Water your hollyhocks especially during the summer Heyday regularly, even daily if necessary. Make sure, however, that no waterlogging occurs. If the ground is too firm, you can loosen it up a little and mix in a little sand or gravel. With poor soil fertilize Your hollyhocks once or twice a month.
It is also often recommended to cut off the first green leaves in spring, as this is the time when rust hits particularly often. One is also helpful Cut back in the autumn. Although the green above ground disappears in winter, the rust fungus can spread unhindered during the rotting period. You can spray your hollyhocks with a broth made from horsetail or with compost stock.
The most important tips against mallow rust:
- prevent in time
- sunny, not too humid location
- sufficient plant spacing
- water regularly
- fertilize in nutrient-poor soil
- remove the first leaves in spring
- Sprinkle with horsetail broth or compost stock
Tips
If you have discovered the first signs of mallow rust on your hollyhock, you should react quickly, the fungal spores are very robust and persistent.
