Plant Parasites of Europe

leafminers, galls and fungi

gallers on genus Nicotiana

Dichotomous table for gallers on Nicotiana

by Hans Roskam

1a On roots or root collar => 2

1b ale green, spongy, bladder- or bulging expanded swellings, 5–20 mm long or more; on young plants mainly at stem base, on older ones higher on stem. Ditylenchus dipsaci

1c Stunting of growing points, curling of leaves. Myzus persicae subsp. nicotianae

2a oots with spindle- shaped or nodular swellings. Nicotiana spp.: Meloidogyne hapla

2b Conspicuous cancer-like malformations of various size, mainly on root collar, but also on higher situated stem parts. Nicotiana spp.: Agrobacterium tumefaciens

2c On the root collar, especially of N. glutinosa, less on N. tabacum occur the leafy galls Rhodococcus fascians

Last modified 18.xi.2023