Spotted lanternfly
An invasive planthopper that feeds in groups on sap from grapes, fruit trees and many other plants, leaving sticky honeydew and sooty mould.
Also known as: Lycorma delicatula
Symptoms and identification
Groups of black, white-spotted nymphs, and later grey adults with red underwings, cluster on stems and trunks. Sticky honeydew drips from plants and grows black sooty mould, leaves wilt, and plants such as grapes decline. Egg masses look like grey, mud-like smears on bark, stones and outdoor items.
Causes
The insect arrived in North America from Asia and spreads on vehicles, firewood and outdoor goods. It feeds on over 70 plant species, with a strong liking for tree of heaven, grapevines and fruit trees.
Organic treatment
Scrape egg masses off into a bag of alcohol or hand sanitiser from autumn to spring, and kill nymphs and adults by hand or with insecticidal soap. Report new infestations to the local agricultural authority.
Prevention
Check vehicles, firewood and outdoor furniture when travelling from infested areas, and remove tree of heaven, which is a favourite host. Follow local quarantine rules.
Chemical treatment (use with care)
Use an insecticide labelled for spotted lanternfly on that plant, following the label, or ask your local extension service about suitable options.