aphis

Aphis species

Three species of Aphis have been recorded on lettuce in Australia. The winged adults are difficult to tell apart and should be referred to an expert.

Apterae are a little easier:

1.	Dorsum of abdomen with large dark patch	Cowpea aphid, Aphis craccivora Koch
	Dorsum of abdomen pale	2.

2.	Cauda and siphunculi both dark	Spiraea aphid, Aphis spiraecola Patch
	Cauda pale; Siphunculi dark	Melon aphid, Aphis gossypii Glover

Hosts:
All three Australian species of Aphis can be found on a wide variety of hosts although cowpea aphid has a preference for Fabaceae.

Distribution:
Widespread in most areas of the world.

Further information: on Aphis gossypii can be found on the PaDIL website.

Document 5411, submitted 12 December 2005
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