Scouting for Tobacco Thrips and Tomato Spotted Wilt Virus
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Collapse ▲When to scout for tobacco thrips and tomato spotted wilt virus
Tobacco thrips are not primary pests in tobacco and are of most significant concern as vectors of Tomato Spotted Wilt Virus (TSWV). TSWV infections cause the most damage to plants when they occur within the first six weeks following transplant, although symptoms from infections occurring during this time may not develop for a few weeks after infection.
What part of the plant to scout for thrips and TSWV
Tobacco thrips are visible on leaf surfaces in the first three to four weeks following transplant. TSWV symptoms can be highly variable but often begin as leaf lesions. If the infection becomes systemic, the bud may be infected, and the plant often exhibits “classic” bilateral wilting. TSWV infection can confirmed via the NCSU Plant Disease and Insect Clinic.
TSWV infected plant. Photo: Hannah Burrack
How to scout for thrips and TSWV
Thrips are very small and may require a hand lens or magnifying glass to observe. When the thrips are young, they are yellow, and wingless. However, direct scouting for thrips may not provide an accurate picture of the population. Thrips population models are more effective at determine when thrips generations (or “flights”) may occur.
A magnified picture of a tobacco thrips. Photo: Robert M. McPherson, University of Georgia, Bugwood.org
Thrips and TSWV thresholds
There are no economic thresholds for thrips and TSWV rescue treatments in tobacco, as all management tools are preventive. Preventative management is recommended in locations where TSWV incidence is greater than 10% infection without intervention.