Troubleshooting
Beauregard Sweet Potato problems — and how to fix them
Beauregard Sweet Potato (Ipomoea batatas) is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Vine weevil
Larvae attack tubers underground. Use nematode biological control (Steinernema kraussei) in late summer/early autumn.
Slug damage on tubers
Surface scarring and tunnelling. Harvest promptly once mature; use ferric phosphate pellets if damage is severe.
Poor tuber set
Caused by excessive nitrogen, cold soil, or drought stress early in the season. Ensure warm soil (18°C+) at planting and use a low-nitrogen feed.
Powdery mildew
White powder on leaves in dry conditions. Ensure adequate air circulation, especially in polytunnels. Water at the base rather than overhead.
Mice and voles
Root-zone tubers are attractive to rodents. Protect with wire mesh below the bed if rodent pressure is high.
Prevent beauregard sweet potato problems before they start
Most beauregard sweet potato issues are care-mismatch, not bad luck. Dial in the basics:
Beauregard Sweet Potato problems — FAQ
Why is my beauregard sweet potato vine weevil?
Larvae attack tubers underground. Use nematode biological control (Steinernema kraussei) in late summer/early autumn.
Why is my beauregard sweet potato slug damage on tubers?
Surface scarring and tunnelling. Harvest promptly once mature; use ferric phosphate pellets if damage is severe.
Why is my beauregard sweet potato poor tuber set?
Caused by excessive nitrogen, cold soil, or drought stress early in the season. Ensure warm soil (18°C+) at planting and use a low-nitrogen feed.
Why is my beauregard sweet potato powdery mildew?
White powder on leaves in dry conditions. Ensure adequate air circulation, especially in polytunnels. Water at the base rather than overhead.
Why is my beauregard sweet potato mice and voles?
Root-zone tubers are attractive to rodents. Protect with wire mesh below the bed if rodent pressure is high.