Although the pimpinelle is quite robust and unresponsive, it can still be infected by diseases and pests. Read here what these are and how you can provide first aid.The pimpinelle is not completely immune to pests. A healthy and properly cultivated pimpinelle (Sanguisorba minor) resists most pathogens and pests. However, the plants occasionally suffer from downy mildew and aphids.
No fear! This does not necessarily mean the death of your plant. With the right first aid measures, you can counteract pests and diseases. There are even preventive measures to protect against repeated infestation.
Overview of diseases and pests of pimpinelle
Downy mildew: the harmful “bad weather fungus”
Downy mildew is one of the "bad weather fungi" that feel good in a damp environment. You can identify the infestation by a white or gray coating on the underside of the leaf. In addition, the tops of the leaves can be discolored brown, orange or violet. If no treatment is given, the symptoms spread to the flowers and stems and ultimately destroy the pimpinelle.
Prevent and actively fight
The right preventive measures do not offer complete but very extensive protection of the Pimpinelle against downy mildew. What should I do?
- use a fertilizer that emphasizes potassium and not nitrogen
- Maintain generous planting and row spacing of 30 centimeters
- Do not plant pimpinelle in full shade
- Do not plant pimpinelle in moist locations
- irrigate the soil, do not water the leaves of the pimpinelle
If you find powdery mildew on the pimpinelle despite these measures, you can use effective fungicides that are also suitable for herbs and vegetables. Follow the manufacturer's recommendations strictly. As biological alternatives we recommend, for example:
- Nettle brew
Aphids: the sucking pests
Aphids feed on plant sap. You add suction damage to the leaves of the pimpinelle, which you recognize as yellow discoloration. In addition, aphids leave their excrement as sticky honeydew on the pimpinelle. If the infestation continues, the leaves will shrivel and eventually curl up. The tiny aphids themselves can be seen as green, gray, yellow or black dots on the underside of the leaves when you look closely.
Prevent and actively fight
Make life difficult for aphids around your pimpinelle:
- Create reproductive opportunities for beneficial organisms (dead wood hedges, lacewing boxes)
- Maintain planting and row spacing of 30 centimeters
- Do not plant pimpinelle in monoculture
- Place plants with essential oils such as lavender in the neighborhood
- fertilize with potassium
If you still discover aphids on the pimpinelle, shower the plant vigorously. As astonishing as it sounds: the way back is almost insurmountably long for a flightless aphid that was sprayed only 25 centimeters away from the pimpinelle. In addition, remove all leaves visibly glued by honeydew. Rapeseed oil-based preparations and potash soap are effective and beneficial to the beneficial effects.