Oleander aphid vs Black bean aphid
These two are easy to mix up. Here's how to tell an oleander aphid from a black bean aphid, and whether either one bites or stings.
Oleander aphid
Aphis nerii
Black bean aphid
Aphis fabae
≠The key differences
Often darker (green, red or black) with different host range and seasonally variable colours; not as consistently bright yellow-orange as Aphis nerii.
⚖︎Side by side
| Oleander aphid | Black bean aphid | |
|---|---|---|
| To humans | Non-toxic | Non-toxic |
| Size | 1.5-3 mm body length | 1.5-3 mm body length |
| Colours | Bright yellow, Orange, Black (markings) | Black, Dark brown, Dark green (occasionally) |
| Family | Aphididae | Aphididae |
| Habitat | On leaves, stems, buds and new shoots of oleander, milkweed, periwinkle and related plants; often in warm, sunny gardens and landscaping. | Gardens, agricultural fields, hedgerows and on many cultivated and wild host plants |
| Range | Native to the Mediterranean region; now widespread (cosmopolitan) where host plants are cultivated, including North America, Europe, Africa, Asia, Australia and other regions. | Widespread across temperate regions worldwide; common in Europe, Asia, North America and elsewhere |
| Active | Active spring through autumn in temperate climates; year-round in warm regions. Mostly active during daylight but remain on plants continuously. | Spring to autumn in temperate regions; multiple generations per year, active by day |
| Pest? | Yes | Yes |
🔍How to spot an oleander aphid
- Bright yellow to orange, plump aphids in dense clusters on young shoots, buds and undersides of leaves.
- Long black cornicles and black legs contrast with the yellow body.
- Presence on typical hosts: oleander, milkweed, periwinkle and related plants.
- Winged adults darker on head/thorax with clear wings when present.
🔍How to spot a black bean aphid
- Clusters of small (1.5-3 mm), shiny black or very dark brown pear-shaped aphids on stems, leaf veins and new shoots
- Short cornicles (tailpipes) visible on the back end of the abdomen when viewed closely
- Dense colonies often produce sticky honeydew and may be attended by ants
- Winged adults have a dark body with transparent wings and appear when colonies become crowded or deteriorating
?Frequently asked questions
What is the difference between an oleander aphid and a black bean aphid?
Often darker (green, red or black) with different host range and seasonally variable colours; not as consistently bright yellow-orange as Aphis nerii.
Is an oleander aphid or a black bean aphid more dangerous?
Oleander aphid: Non-toxic. Black bean aphid: Non-toxic. Oleander aphids do not bite or sting people. Does not bite or sting people.
Identification from photos is never certain: don't handle insects you can't identify, and get medical advice for bites, stings or allergic reactions.