Plant Parasites of Europe

leafminers, galls and fungi

gallers on Bassia

Dichotomous table for gallers on Bassia

(incl. Kochia)

by Hans Roskam

1a On parts above ground => 2

1b Side roots with nodular swellings, up to 3 mm long and 2 mm broad. B. scoparia: Meloidogyne hapla<

2a Malformation caused by animals => 3

2b Malformation caused by false mildews => 5

3a Shoot tip stunted => 4

3b Pod-shaped upwards folds on slightly thickened and discoloured, partially sickle-curved downwards curved halves of leaf blade. B. scoparia: Hayhurstia atriplicis

4a Gall consists of a rotund tuft of olive-coloured leaves, 10–15 mm across; leaves longer and more pubescent than normal ones, covered with abundant, long, whitish hairs. Leaves inserted on a shortened twig, succulent, one- or multi-chambered. Each chamber contains a single whitish larva. B. muricata: Stefaniola houardi

4b Terminal leaves and vegetative buds, which are transformed into small one-chambered galls, and inflorescence primordia, with long, dense pubescence; infected organs united into a tuft, about pea- to hazelnut-size, usually rotund, sometimes elongated. B. prostrata: Kochiomyia kochiae

5a Upper side of the leaf with lemon yellow spots. Underside with a brown down of erect conidiophores that apically are dichotomously branching several times, each branch ending in a conidium. B. prostrata: Peronospora kochiae-prostratae

5b Similar malformation, spots pale and down greyish purple. B. scoparia: Peronospora kochiae-scopariae

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