Pisum, garden pea

Mines can occur also in the petioles and even in the tendrils. These can be indentified only by a study of the larvae or by breeding.

1a corridor, widening into a large blotch => 2

1b a corridor from begin to end => 3

1c galls, etc => 100

2a frass powdery, in black-green clouds along the margins of the blotch or in the end of short side branches: Scaptomyza flava

2b frass in large, widely separated black lumps: Agromyza lathyri

3a puparium in the mine, in a, usually under-surface, pupal chamber: Chromatomyia horticola

3b before pupation the mine is left through a semicircular exit slit => 4

4a frass in a broad, central green band; larva: rear spiraculum with 3 papillae: Liriomyza congesta

4b frass in black thread fragments, never in a green band; rear spiraculum with > 3 papillae => 5

5a corridor pinnately branched, main branch overlying the midrib: Liriomyza strigata

5b corridor not pinnate => 6

6a corridor usually beginning upper-surface, but further on turning lower-surface; most mines in the basal half of the leaf; corridor often follows the midrib for some stretch: Liriomyza huidobrensis

6b corridor beginning lower-surface, often remaining so till the end; mines in the entire leaf, without a tendency to follow the midrib: Liriomyza pisivora

100a Nematoda => 101

100b Acari => 102

100c Coleoptera => 103

100e Diptera => 104

100f Hemiptera => 105

100d Hymenoptera => 106

100g rust fungi => 107

100h smut fungi => 108

100i powdery and downy mildews => 109

100j other causers => 110

101 – Nematoda

101a Anguinidae: Ditylenchus dipsaci

101b Heteroderidae: Heterodera goettingiana, trifolii

101c Meloidogynidae: Meloidogyne hapla

103 – Coleoptera

103a Curculionidae: Tychius quinquepunctatus

104 – Diptera

104a Cecidomyiidae: Contarinia pisi

105 – Hemiptera

105a Aphididae: Acyrthosiphon pisum

107 – rust fungi

107a Pucciniaceae: Uromyces pisi, striatus, viciae-fabae

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe pisi var. pisi

109b Peronosporaceae: Peronospora pisi

110 – other causers

110a Bacteria, Actinomycetales: Rhodococcus fascians

Not included in the key: Amauromyza chamaebalani; Liriomyza bryoniae, trifolii.

12/04/2017