Check these first
- Look for tiny holes in the fruit.
- Check the ground for fallen shriveled berries.
- Inspect the leaves for wilting or brown spots.
Likely causes
Blueberry Maggot
Most likelyHow to tell: Fruit becomes soft and mushy before it is fully ripe. You might see tiny exit holes on the skin of the berry.
What to do: Hang yellow sticky traps in the bush to monitor and catch adults. If infestation is heavy, use an organic spinosad spray according to label directions.
Mummy Berry Fungus
Most likelyHow to tell: Berries turn into hard, shriveled, black mummies instead of ripening. The leaves and shoots may also wilt and turn brown.
What to do: Remove and destroy all mummified berries from the ground and the bush. Do not compost them, as the fungus will survive to infect next year.
Find out what's wrong with your blueberry
The list above covers the usual causes. Pocket Botanist looks at a photo of your actual plant and tells you the likely cause, how serious it is, and what to try first. Identification and a health check are free.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
When to worry
It is serious if you lose a large portion of your harvest. If you only see one or two affected berries, simply remove them immediately.
Stopping it coming back
Clean up all fallen fruit and debris under the bush every autumn. This breaks the life cycle of both pests and fungi.
Blueberry: pests? Check yours with a photo
Every plant is a little different. Take a photo of your blueberry and Pocket Botanist tells you which cause is most likely, how serious it is, and what to try first. A few checks a day are free. Save the plant and you get care reminders timed for it.
Scan with your phone's camera to get the app
Or go to pocketbotanist.app/get on your phone
Get the app · Or check it from a photo now, free
Questions people ask
- Are the berries safe to eat if they have maggots?
- Most people prefer to discard them. If you find a maggot, the fruit is likely compromised and will not taste good.
- Can I prevent mummy berry with a spray?
- Yes, a fungicide labeled for mummy berry, applied from bud break through bloom, can help. However, sanitation is the most effective way to stop it.
Guides to these causes
More problems with Blueberry
- Why are my highbush blueberry leaves turning yellow?
- Why does my highbush blueberry have spots on its leaves?
- Why is my highbush blueberry not producing flowers?
- How do I know if my highbush blueberry has root rot?
- Why is my highbush blueberry bush drooping?
- Why are my highbush blueberry leaves getting brown tips?
- Why is my highbush blueberry dropping its leaves?
- Why is my highbush blueberry growing so leggy?
- Why are my blueberry bush leaves curling?
This article was generated with AI on from the plant’s care profile and is general information, not horticultural advice. Read about how we build these guides.

