Dichotomous table for gallers on Buddleja davidii
by Hans Roskam
1a Malformations of vegetative parts => 2
1b Aborted flower buds contain several midge larvae. Asphondylia buddleia
2a Smaller roots with nodular swellings. Meloidogyne hapla
2b eaf blade over tip and margins usually loosely and obliquely rolled downwards; curled close to the froth-covered nymph. Philaenus spumarius