Eupteryx melissae is a common leafhopper which specifically feeds on sage and other plants in the Lamiaceae family. Mallow, lemonbalm and catmint are some of its other favoured foods.
It's a true bug (Order: Hemiptera), so feeds using a needle-like feeding tube. It sucks up the liquid plant material from within the leaves.
Its feeding behaviour causes pale mottling to appear on leaves. It may seem unsightly, but all damage is purely aesthetic, with plant health remaining unaffected.
Leafhoppers are preyed upon by an abundance of predatory arthropods which are frequent garden visitors. These include lacewings, parasitic wasps, spiders, damsel bugs and ladybirds.