Plant Parasites of Europe

leafminers, galls and fungi

gallers on Phlox

Dichotomous table for gallers on Phlox

by Hans Roskam

1a On roots or on root collar => 5

1b On parts above ground => 2

2a Malformations on vegetative parts => 3

2b nflorescence ± half-globularly clustered as result of shortening of axis. Development of flowers stunted, usually unopened. P. paniculata: Unidentified dipteran

3a Causers on outside of malformations => 4

3b Single or all shoots of a plant strongly shortened by eelworms living inside the tissue, variously swollen, leaves ± curved and curled, partially strongly reduced, narrowed, almost thread-like. Shoot tuft- to broom-like. P. amoena, paniculata, etc.: Ditylenchus dipsaci

4a Leaves strongly rolled and curled over their tips, locally deep green. Phlox spp.: Philaenus spumarius

4b Malformations of leaf blades caused by aphids. P. paniculata: Unidentified aphid

5a On root collar => 6

5b Roots with small swellings bearing several side roots. P. paniculata, etc.: Meloidogyne hapla

6a Considerable proliferations with only small partitioned surface. P. paniculata: Agrobacterium tumefaciens

6b Clustering of crook-backed branched, markedly shortened, fleshy thickened shoots. P. paniculata, etc.: Rhodococcus fascians

Last modified 17.v.2020