Last modified: May 20, 2019, 1:06 p.m.
S. myopaeformis is not a rare species in Belgium and can be very common, especially in older orchards.
S. myopaeformis is a medium sized species (14–26 mm). The completely black wings and the red band on the abdomen –which is very slender with the males– are typical for this species. The base of the wings is not diffusely covered with orange-red scales (in contrast with S. culiciformis that is often confused with this species). The female is similar to the male but lacks the slender abdomen. The palps are ventrally pure white in the males and brown to black in the females which is another very useful characteristic distinguishing it from S. culiciformis. In the latter, the palps are ventrally bright orange. The proboscis is, as in all species of this genus, well developed and functional.
The males are very well attracted to the pheromone developed for this species and are best lured in early afternoon although the optimal time span is very weather dependent.
The egg is elliptically shaped and light orange-brown.
The eggs are deposited in crevices in the bark near cancerous swellings, grafts or wound edges. The larva lives between the wood and bark often at the transition zone between dead and living tissue. The caterpillar often lives in a flat mine that is very moist because of the abundant plant juice. In many cases this sap colours the larva with pink and brown stains. In Belgium, the larva of S. myopaeformis hibernates mostly once but in unfavourable conditions a second wintering is possible. After wintering, a cocoon is constructed made from gnawed plant particles spun together and with a silken lining at the inside. It is not uncommon that the cocoon is located under semi-erect bark pieces.
The adults have been observed from mid May till late August.
The larva lives under the bark of a variety of trees, especially old fruit trees of the Rosaceae family, mainly in Malus domestica (and other Malus species) but also in Prunus spp., Crataegus spp., Sorbus spp. and Pyrus spp.