TSWV infects over 1000 plant species and causes significant economic damage to many agronomic and horticultural corps. In some areas the virus has been found to be ubiquitous in the environment as it can infect many weeds, landscape plants, and native plants. Symptoms of tomato spotted wilt differ among hosts and can be variable in a single host species. Stunting is a common symptom of TSWV infection, and is generally more severe when young plants are infected (Figure 3). Chlorotic or necrotic rings form on the leaves of many infected hosts (Figure 4), and may also appear on the fruits of some hosts (Figure 1). Necrosis may develop in the foliage of some hosts, making diagnosis based on symptoms alone difficult (Figure 5). Although TSWV is not seed transmitted, it may cause the discoloration of seed produced on infected hosts (Figure 6). Hence, tomato spotted wilt may affect both the quantity and quality of plant products. Additionally, movement of infected plant material may result in TSWV being introduced into a new setting.