phylloxeran

…includes aphids or plant lice, phylloxerans, coccids, scales, whiteflies, and mealybugs.

…the winter eggs of the Phylloxera plant louse. The Bordeaux mixture fungicide (copper sulfate and lime), discovered accidentally in 1882, was used successfully against vine downy mildew; this compound is still employed to combat it and potato blight. Since many insecticides available in the 19th century were comparatively weak, other…