Larva feed on smooth tare Vicia tetrasperma and rarely on meadow vetchling Lathyrus pratensis as long as V. tetrasperma is in the vicinity. Larva forms a case from a seedpod, eating the green seeds and then using the pod as a mobile home to attack other pods.The only larva likely to cause confusion is that of the tortix moth Cydia nigricana.
Discovered as a British species at Fingringhoe Wick NR in 1973 (Emmet & Uffen, 1975), although it appears to be extinct there now, and Little Oakley, where it still survives. Very little further recording took place until the mid-1990s. Based on available knowledge, the species was given Provisional Red Data Book status.
From the mid-1990s a number of sites have been visited, some have drawn a blank but others support the moth, sometimes in good numbers. It was thought to be a sedentary species, not straying far from the coast, but it is now known to breed well inland. The Dorset record may indicate unknown colonies or migration, and the moth might be found breeding far away from north-east Essex if searched for. The inland record (at Colchester) must have been formed during the last fifteen years as the habitat before then was unsuitable.
Emmet, A.M., & Uffen, R.W.J., 1975. Coleophora fuscicornis (Zeller, 1847) (Lep.: Coleophoridea), a species new to Britain. Entomologistís Record.J.Var. 87: 259 - 266.
Gibbs, D., 2001. Coleophora fuscicornis (Zeller, 1847) (Lep.: Coleophoridea) discovered in Dorset. Entomologistís Gazette 52: 166.