The leaf and stem mines of British flies and other insects
 

(Coleoptera, Diptera, Hymenoptera and Lepidoptera)

by Brian Pitkin, Willem Ellis, Colin Plant and Rob Edmunds

 

CHAEROPHYLLUM. Chervils. [Apiaceae]


Four species of Chaerophyllum are recorded in Britain. These included the native Rough Chervil (C. temulum) and the introduced Broad-leaved Chervil (C. aromaticum), Golden Chervil (C. aureum) and Hairy Chervil (C. hirsutum).

Four British miners are recorded on Chaerophyllum.

A key to the European miners recorded on Chaerophyllum is provided in Bladmineerders van Europa.



Key for the identification of the known mines of British
insects (Diptera and non-Diptera) recorded on Chaerophyllum


1a > Leaf-miner: A short, narrow, linear mine, generally closely following margin of leaf segment; in very small sections of a leaf producing a secondary blotch (Spencer, 1972b: 89 (fig. 302), 92; Spencer, 1976: 401 (fig. 702), 402).

Upper-surface corridor, in the end widening so strongly that within the limited space of an umbelliferous leaf often a secondary blotch is the result. The upper-surface mine is preceded by a short lower-surface corridor, made by the first instar larva during the first part of this stage (Allen, 1956a). It is difficult to observe, also because it tends to follow the leaf margin. Frass in two untidy rows of isolated grains. Before pupation the larva leaves the mine through a semicircular exit slit in the lower epidermis.

A narrow mine, follows leaf marginand forms secondary blotches .

Phytomyza chaerophylli puparium
Phytomyza chaerophylli puparium
Image: © Willem Ellis (Bladmineerders van Europa)

On Anthriscus, Chaerophyllum, Conopodium, Daucus, Torilis and possibly Sison in Britain and additional Apiaceae elsewhere. Common and widespread throughout Britain. Also recorded in the Republic of Ireland and widespread and common throughout much of Europe.

Phytomyza chaerophylli Kaltenbach, 1856 [Diptera: Agromyzidae].

1b > Leaf-miner: Young larvae make small, full depth blotch mines, almost without frass. Older larva live externally on the plant under a light web . Initially forms a small blotch mine and may later feed in a slight web. In coastal areas may continue mining throughout the larval stage .

On Daucus carota and Pimpinella saxifraga, but not yet on Chaerophyllum, in Britain and Anthriscus caucalis, Athamanta cretensis, Daucus carota, Meum athamanticum, Pimpinella saxifraga, Thapsia villosa and Torilis arvensis subsp. neglecta elsewhere. East Cornwall, Isle of Wight and West Cornwall and Britain. Widespread in continental Europe.

Epermenia aequidentellus (Hofmann, 1867) [Lepidoptera: Epermeniidae].

1c > Leaf-miner: The larvae are often gregarious and feed on the underside of the leaf causing a 'windowing' effect as they eat the mesophyll and lower epidermis. This effect can be seen from the top of the leaf as it discolours . Short, small, irregular, sometimes widened corridor. Mostly a number in a leaf, concentrated in the axils of the midrib and the primary side veins. Each larva makes a number of mines. Often the larva protrudes with its rear end out of the mine, causing most frass to be ejected. While moving, at the leaf underside, silken threads are produced, in wich grains of frass may be trapped. Older larvae live free and cause window feeding, often in a group under a light spinning.

Polyphagous. On Angelica sylvestris, Anthriscus sylvestris, Daucus carota, Heracleum sphondylium and Heracleum sativa, but not yet on Chaerophyllum, in Britain and Aegopodium podagraria, Angelica archangelica subsp. litoralis, Angelica sylvestris, Anthriscus caucalis, Anthriscus cerefolium, Anthriscus sylvestris, Apium graveolens, Berula erecta, Carum carvi, Chaerophyllum hirsutum, Chaerophyllum temulum, Cicuta virosa, Conium maculatum, Daucus carota, Heracleum sphondylium, Levisticum officinale, Oenanthe, Pastinaca sativa, Peucedanum, Pimpinella saxifraga, Seseli libanotis, Sium latifolium, Sison amomum and Torilis elsewhere. Widespread in Britain and continental Europe.

Epermenia chaerophyllella (Goeze, 1783) [Lepidoptera: Epermeniidae]

1d > Leaf-miner: In the first instar the larva mines the leaves, forming short, irregular, blotch-like mines, but in later instars it lives externally, feeding in spun leaves and often twisting those of tender shoots. Larval head light-brown or yellowish brown, edged with black postero-laterally, ocellar area blackish; prothoracic plate black edged with whitish anteriorly; abdomen dull dark green; pinacula distinct, black, sometimes brownish but with black bases to setae; anal plate large, black (Bradley et al., 1973). Small, full depth mine without a definite shape; little frass. Some silk is deposited in the mine. The larva soon leaves the mine and continues feeding among spun leaves.

Polyphagous. On numerous genera and species of several plant families, but not yet Chaerophyllum, in Britain and elsewhere. Widespread in Britain and continental Europe. Also recorded from the Channel Is.

Cnephasia incertana (Treitschke, 1835) [Lepidoptera: Tortricidae].



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