Plant Parasites of Europe

leafminers, galls and fungi

gallers on Forsythia

Dichotomous table for gallers on Forsythia

by Hans Roskam

1a On parts above ground => 2

1b Roots with nodular, compact swellings. F. x intermedia: Meloidogyne hapla

2a Galls on twigs => 3

2b Leaves on shoot tips ± disfigured, caused by aphids. F. suspense: Unidentified aphid

3a Rotund galls, usually situated on nodes, developing into strongly fissured woody proliferations, up to several cm large. F. suspense: Agrobacterium tumefaciens

3b Conspicuous, ± wart-like, at first succulent, later on tough galls of variable size, which develop on young shoots instead of lateral buds. Rhodococcus fascians

Last modified 26.v.2020