An infestation of Pyemotes tritici, the straw itch mite, apparently caused dermatitis on the arms and trunks of four workers in south-central Michigan who had unloaded a shipment of brome seed bags. Sampling of bag surfaces and contents indicated that mites occurred inside and on the surface of brome seed bags, but not in bags of other seed present at the site. One bag of fescue in contact with brome seed bags had mites on its surface. Pyemotes tritici densities on the brome seed bags ranged from 0.7 -5.6 per cm , while infestations in brome seed ranged from 0.08-0.33 mites per ml of seed. An insect repellent containing DEET was effective in preventing mite bites.
Walker, Edward D. and Landis, Douglas A.
"Straw Itch Mite, Pyemotes Tritici, Infestation in Brome Seed Related to Acute Dermatitis in Michigan Granary Workers,"
The Great Lakes Entomologist: Vol. 27
, Article 8.
Available at: https://scholar.valpo.edu/tgle/vol27/iss2/8