The Colorado potato beetle is the scourge of potato beds and can strip plants in days, but a time-tested home remedy—mustard plus vinegar—pushes the pests out fast without chemicals or extra costs.
The Mustard–and–Vinegar Mix
Prepare an effective spray from common ingredients:
- 100 g mustard powder
- 10 L water
- 100 ml 9% vinegar
Mix until uniform. The sharp aroma of mustard repels beetles, while the vinegar boosts the effect and makes leaves unattractive to pests.
How to Spray for Best Results
Spray in the morning on a dry day so the solution adheres to foliage. Cover plants from all sides, including the underside of leaves. For better sticking power, some gardeners add a little liquid soap to help the mixture cling and extend its action.
Results and Follow-Up
The method works on both adults and larvae. Within a few hours, beetles begin to leave the plants. To lock in the result, repeat after a few days; two treatments are usually enough.
Safety and Prevention
The solution is safe for people and does not accumulate in tubers, making it ideal for small home gardens where chemicals are unwelcome. For added prevention, plant repellent companions such as marigolds or calendula near potatoes—their scent helps deter reinfestation.
