What is the primary host range for the Tomato spotted wilt tospovirus?

The primary host range for the Tomato spotted wilt tospovirus includes lettuce, tomatoes, and ornamentals. This virus is known for its ability to infect a wide variety of plant species, but these specific plants are particularly susceptible and are often used as indicators of viral presence in agricultural and ornamental settings.

Lettuce is a major agricultural crop that can suffer significant yield losses due to infections. Tomatoes are also economically important and exhibit symptoms such as leaf spots and fruit discoloration when infected with the virus. Ornamentals, which include various decorative plants, are particularly impacted since they can facilitate the spread of the virus in gardens and landscapes.

The other choices include plant species that, while they may be capable of becoming infected, do not represent the primary host range of the Tomato spotted wilt tospovirus. Each of these plants may suffer from a different spectrum of diseases or viruses, but the specificity of the pathogen's primary hosts lies with the group identified in the correct option. Understanding this specificity is crucial for effective pest management and control strategies in agriculture and horticulture.