According to a Pest Management Science Study, all of these oils specifically repel wasps and hornets:
– clove
– pennyroyal
– lemongra
– ylang ylang
– spearmint
– wintergreen
– sage
– rosemary
– lavender
– geranium
– patchouli
– citronella
– roman chamomile
– thyme
– fennel seed
– anise
– peppermint