Euonymus, spindle tree

fam. Celastraceae

1a a branching corridor; main section on top of the midrib; larva remains in the mine till just before pupation: Liriomyza strigata

1b small or large blotch; larvae soon leave the mine to live free => 2

1c galls, etc => 100

2a blotch small, full depth; older larvae, often in large numbers, in a collective spinning: Yponomeuta cagnagella

2b blotch large, upper surface; free-living larvae in a rolled leaf: Gracillaria syringella

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: Cecidophyes psilonotus; Stenacis euonymi

105 – Hemiptera

105a Aphididae: Aphis fabae

105b Diaspididae: Chionaspis salicis

107 – rust fungi

107a Melampsoraceae: Melampsora euonymi-caprearum

109 – powdery and downy mildews

109a Erysiphaceae: Erysiphe euonymi, euonymicola

110 – other causers

110a Bacteria, Rhizobiaceae: Agrobacterium tumefaciens

110b Lepidoptera, Sesiidae: Synanthedon tipuliformis

Not included in the key: Scythropia crataegella.