See:
Greenhouse Plants, Ornamental - Impatiens Necrotic Spot
Symptoms Stunting and browning or necrosis of the central part of young gloxinia plants, resulting in death. Ringspots, veinal necrosis, and chlorotic or necrotic brown line patterns in zigzags may develop on leaves of mature plants. Local lesions may show in as little as 2 days after thrips feeding.
Reference Daughtrey, M.L., Jones, R.K., Moyer, J., Daub, M.E., and Baker, J.R. 1997. Tospoviruses strike the greenhouse industry: INSV has become a major pathogen on flower crops. Plant Disease 81:1220-1230.