|scientific name Profenusa canadensis |
common name Hawthorn leaf miner, Cherry leaf miner
Unknown for adults, larva feeders on ornamental hawthorn and in cherry orchards.
Unknown in Canada, in New York state from late April to early May.
Adults: Small sawflies. 4.0 mm long. Mostly black, ventral surface of antennae occasionally whitish. Male thorax yellow-orange, black meso- and metanotum and yellow-orange abdomen. Female thorax black, posterior margin of pronotum white and abdomen black. All sawflies of this group posses an ovipositor modified to be used as a saw to facilitate the deposition of eggs under the surface of leaves. The serrula (teeth) of the lancet (saw) differs from other North American Profenusa, lobe-like and without basal teeth. (Smith 1971).
Larvae: Broad at anterior end tapering to posterior, slightly dorso-ventrally flattened and white. 6 instars, length and head widths as below for instars 1 -5;
Length (mm) Head Width (mm)
1st 1.2 - 2.3 0.36 - 0.42
2nd 2.6 - 3.0 0.48 - 0.55
3rd 3.2 - 4.3 0.63 - 0.73
4th 4.5 - 7.2 0.80 - 0.90
5th 6.5 - 7.5 0.92 - 1.07
6th similar in length to 5th, head 0.90 – 1.05 mm (Adapted from Parrot and Fulton 1915). Ventral surface of thorax lacking the dark markings found on other North American Profenusa. (Smith 1971).
Parrot and Fulton (1915) and Hamilton (1943) described the life history for this species in New York state. Adults emerge in late April or early May and mate soon after. Females deposit eggs at the leaf margin and towards the bottom portion of the leaf, and may prefer newly unfolded leaves. Eggs hatch 5 - 10 days later and larvae begin to feed with in the leaf. Larvae mine towards the tip of the leaf (Parrot and Fulton 1915). Development to final instar takes 3 - 4 weeks. Larval feeding creates a blotch shaped mine that is more apparent on the upper surface. The under surface may later crinkle and turn brown. Pupation occurs underground, the larvae exit the leaf via a hole cut in the upper surface and construct a cocoon of earth and ‘cement' (Parrot and Fulton 1915) several centimetres deep.
Not of concern, an occasional minor pest throughout its range.
Larvae feed on members of the Rosaceae are recorded from Crataegus (hawthorn) and Prunus (Cherry) from one variety, English Morello. Interestingly, other cherries are not recorded as a host, even when grown in orchards alongside English Morello. (Parrot 1915).
Quebec, Ontario south to Washington DC and west to Iowa, Missouri, Arkansas, Texas, Alberta.
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