Crop: Stokes Aster

Viral causal agent belongs to the genus Tospovirus and is vectored by various thrips species

Symptoms: Chlorotic ring spots can be seen on the leaves at the early stages. These symptoms will have dark ring spots at later stages. The centers of these spots completely degrade over time and will fall off.

Management: Early detection of thrips using yellow sticky traps and active scouting methods can be effective in reducing the spread. Eliminate weeds which harbor the thrips populations. Roguing of infected plants is very important in reducing the spread of the disease through the various thrips sp. which are vectors for TSWV. Pesticide management of thrips is important to prevent secondary spread of the disease from few infected plants.

Additional reference: http://vegetablemdonline.ppath.cornell.edu/factsheets/Virus_SpottedWilt.htm