Symphoricarpos, snowberry

Incl. Symphoria.

1d fleck mine: lobe cae => 2

1b whitish corridor (sometimes stellate and almost a blotch) => 3

1c brown blotch: Perittia obscurepunctella

1d tentiform mine => 8

1e galls, etc => 100

2a the rings that build up the case are cut out of the lower epidermis: Coleophora ahenella

2b cur out of the upper epidermis: Coleophora violacea

3a puparium outside the mine; mine never stellate, never with a lower-surface part => 4

3b puparium in the mine; mine often stellate, always with a lower-surface part => 6

4a larva in early spring (April, less often May) in the tender leaves; larva: rear spiraculum with a thorn, within the circle of papillae: Aulagromyza cornigera

4b larva later in the season; rear spiraculum without a central thorn => 5

5a frass in discrete grains: Aulagromyza hendeliana

5b frass in a broad green band, with scattered black grains: Aulagromyza luteoscutellata

6a mine seems to consist of a number of branches, each beginning independently on the midrib; puparium greenish: Chromatomyia aprilina

6b mine consists of a number of corridors, radiating from 1 point (not on the midrib); puparium light or dark brown => 7

7a corridors relatively long, yellow-green; puparium dark brown; frass in pearl chains: Chromatomyia lonicerae

7b corridors much shorter (mine almost a stellate blotch), grey; puparium light brown; frass in discrete grains: Chromatomyia periclymeni

8a the mine, quite large, makes the leaf roll lengthwise: Phyllonorycter emberizaepenella

8b mine much smaller, rolling the leaf transversely or obliquely: Phyllonorcter trifasciella

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

102 – Acari

102a Eriophyidae: Eriophyes brownei

105 – Hemiptera

105a Aphididae: Hyadaphis foeniculi; Rhopalomyzus lonicerae

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe symphoricarpi

Not included in the key: Aulagromyza flavoscutellata; Gracillaria syringella; Perittia herrichiella.

17/12/2015