In article , Stephen Howard
writes

Aphids exude a sweet, sticky substance called honeydew - I expect the
wasps are attracted to it in the same way as they're attracted to the
traditional wasp trap...jam and water in a jar.

A decent spot of rain should go some way to resolving the problem,
such as it is.

Regards,



No it doesn't! Well not on our red oak it doesn't, the rain certainly
didn't seem to wash off the sticky honeydew. (Hence my thread about
wasps in oak tree)
--
Janet Tweedy
Dalmatian Telegraph
http://www.lancedal.demon.co.uk