Plant Parasites of Europe

leafminers, galls and fungi

gallers on Galinsoga

Dichotomous table for gallers on Galinsoga

by Hans Roskam

1a On above-ground parts => 2

1b Roots with spindle- to nodule-shaped swellings. G. parviflora: Meloidogyne hapla

2a Distortion of leaves => 4

2b Galls mainly on stems => 3

3a Initially hyaline, later on browned, glabrous ± spindle-shaped swellings of the stems on all sides or, if on one side, bent, occasionally on petioles and leaf veins, even on involucral bracts, exceptionally on adventitious roots; of various shapes and dimensions. Young plants swollen at stem base. G. parviflora: Protomyces buerenianus

3b Blunt, spongy swellings of the stems, ± uneven, at their surface, the inside with eelworms. G. parviflora: Ditylenchus dipsaci

4a Tight curling of the locally intensively green coloured leaf blade caused by a froth-covered nymph. G. quadriratiata, parviflora: Philaenus spumarius

4b Wrinkling and downward bending of the leaf blade. G. parviflora: Unidentified aphid

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