Requires 48 h dew at 20-25 C for severe infection. Ex Austria, Hungary, Switzerland. La mine roots.
Ad eat young leaves.
Ex Austria, Hungary. Not est AB, SK but surviving in field cages. Reduced spurge flowering in MB on moist clay river bank where it survived flooding for 3 weeks. La mine roots. Reduced spurge at two AB sites on coarse soil with high water table, but A. nigriscutis commoner.