Heracleum [Apiaceae]

HERACLEUM. Hogweeds. [Apiaceae]

Three species of Heracleum are recorded in Britain. These include the native Hogweed (H. sphondylium) and Giant Hogweed (H. mantegazzianum).

Seven Diptera miners, the agromyzids Ophiomyia heracleivora, Phytomyza heracleana, Phytomyza pastinacae, Phytomyza sphondyliivora and Phytomyza spondylii, and the tephritids Cryptaciura rotundiventris and Euleia heraclei are recorded on Heracleum in Britain, although those of Cryptaciura rotundiventris require comfirmation.

British records of Pegomya solennis (= versicolor) on Heracleum are discounted by Griffiths (1982) as probable misidentifications of the tephritid Euleia heraclei.

The agromyzid Melanagromyza angeliciphaga is recorded boring stems of Heracleum and other Apiaceae in Britain and elsewhere.

Hogweed
Heracleum sphondylium

Elsewhere the polyphagous agromyzids Liriomyza lutea, Liriomyza strigata, Phytomyza angelicae, Phytomyza heracleana, Phytomyza pastinacae, Phytomyza spondyli, Phytomyza sphondyliivora and Ophiomyia heracleivora and the tephritid Euleia heraclei are recorded mining Heracleum.

Elsewhere the agromyzid Liriomyza lutea is recorded feeding in the seed heads of Heracleum.

Elsewhere the agromyzid Melanagromyza limata is recorded on Heracleum, but its life-style is unknown.

Elsewhere the agromyzid Napomyza carotae is recorded on Apium. In larval transfer experiments in Switzerland found that the larvae of Napomyza carotae developed normally in Apium, Heracleum, Pastinaca and Petroselinum.

One non-Diptera leaf-miner is recorded on Heracleum in Britain (see below).

Elsewhere one additional non-Diptera leaf-miner is recorded on Heracleum (see below).

A key to the miners recorded on Heracleum is provided in Bladmineerders van Europa. This includes Euleia heraclei, Liriomyza strigata, Pegomya vanduzeei, Phytomyza heracleana, Phytomyza pastinacae, Phytomyza spondyli, Phytomyza sphondyliivora, Epermenia chaerophyllella but not Ophiomyia heracleivora.

N.B. The key to mines below includes mines recorded on Astrantia and Heracleum (Apiaceae).

Key for the identification of the mines of British Diptera recorded on
Heracleum

Note: Diptera larvae may live in a corridor mine, a corridor-blotch mine, or a blotch mine, but never in a case, a rolled or folded leaf, a tentiform mine or sandwiched between two more or less circular leaf sections in later instars. Pupation never in a cocoon. All mining Diptera larvae are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall. The larvae lie on their sides within the mine and use their pick-like mouthparts to feed on plant tissue. In some corridor miners frass may lie in two rows on alternate sides of the mine. In order to vacate the mine the fully grown larva cuts an exit slit, which is usually semi-circular (see Liriomyza huidobrensis video). The pupa is formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).

1a > Stem miner: An external mine on stem or leaf stalk. Pupation either at leaf base or beneath epidermis of main stem.

On Heracleum in Britain and continental Europe. Widespread in south, but not common, in Britain. Widespread in continental Europe.

Ophiomyia heracleivora Spencer, 1957 [Diptera: Agromyzidae].

1b > Leaf miner

2a > Leaf miner: Interparenchymal mine.

2b > Leaf miner: Mine not interparenchymal.

3a > Leaf miner: A regular greenish inter-parenchymal blotch mine, frequently delimited by two veins, appearing somewhat mottled as a result of small deeper areas of feeding through the upper parenchyma. Puparium black.

On Heracleum in Britain and this and other Apiaceae elsewhere including Heracleum in Britain. Widespread in Britain and continental Europe. Also recorded in the Republic of Ireland.

Phytomyza heracleana Hering, 1937 [Diptera: Agromyzidae].

3b > Leaf miner: Mine inter-parenchymal, greenish-yellow, not always readily visible, an irregular linear-blotch.

Mine of Phytomyza sphondyliivora on Heracleum
Image: Rob Edmunds (British leafminers)

On Heracleum, in Britain and elsewhere. Widespread in England. Also recorded in continental Europe.

Phytomyza sphondyliivora Spencer, 1957 [Diptera: Agromyzidae].

4a > Leaf miner: A large blotch, yellow or brown, preceded by a short corridor that in the end mostly is completely overrun. Generally several larvae share a mine. Especially in fresh mines the green primary and secondary feeding lines are well visible. Pupation outside the mine. Puparium yellow.

On numerous genera of Apiaceae and possibly some Asteraceae in Britain and elsewhere, including Heracleum in Britain. Throughout the British Isles. Also recorded in the Republic of Ireland and most of the Palaearctic region, as far east as Afghanistan.

Euleia heraclei (Linnaeus, 1758) [Diptera: Tephritidae].

4b > Leaf miner: A large blotch, yellow or brown, preceded by a short, in the end mostly unrecognisable corridor. Generally several larvae in the mine. Especially in fresh mines the green primary and feeding lines area well marked. Pupation outside the mine.

On Angelica and possibly Arctium and Heracleum in Britain. Widespread but very rare in Britain. Also recorded in the Republic of Ireland and throughout Europe, except in the south.

Cryptaciura rotundiventris (Fallén, 1814) [Diptera: Tephritidae].

4c > Leaf miner: Corridor mine.

5 > Leaf miner: A conspicuous, whitish linear mine. Pupation external.

Most records require confirmation, since the two names have been treated as synonyms and distinct species. Recorded on ? Astrantia, ? Heracleum and ? Pastinaca in Britain and Heracleum, Levistium and Pastinaca elsewhere. Widespread and common throughout the British Isles. Also recorded in the Republic of Ireland. Widespread in continental Europe.

Phytomyza spondylii Robineau-Desvoidy, 1851 [Diptera: Agromyzidae].
OR
Phytomyza pastinacae Hendel, 1923 [Diptera: Agromyzidae].

Key for the identification of the mines of British
non-Diptera recorded on Heracleum

Note: The larvae of mining Coleoptera, Hymenoptera and Lepidoptera may live in a corridor mine, a corridor-blotch mine, a blotch mine, a case, a rolled or folded leaf, a tentiform mine or sandwiched between two more or less circular leaf sections in later instars. Larva may pupate in a silk cocoon. The larva may have at least six legs (although they may be reduced or absent), a head capsule and chewing mouthparts with opposable mandibles (see video of a gracillarid larva feeding). Larvae of Hymenoptera and Lepidoptera usually also have abdominal legs (see examples). Frass, if present, never in two rows. Unless feeding externally from within a case the larva usually vacates the mine by chewing an exit hole. Pupa with visible head appendages, wings and legs which lie in sheaths (see examples).

1a > 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 (Bladmineerders van Europa).

Recorded on numerous genera and species of several plant families, including Heracleum, in Britain and elsewhere. Widespread in Britain and continental Europe. Also recorded from the Channel Is.

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

1b > 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 (British leafminers). 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 (Bladmineerders van Europa).

Recorded on Angelica sylvestris, Anthriscus sylvestris, Daucus carota, Heracleum sphondylium and Heracleum sativa 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, Silaum, Sium latifolium, Sison amomum and Torilis elsewhere. Widespread in Britain and continental Europe.

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


	Last updated 05-Feb-2012 Brian Pitkin