Abstract
Tobacco thrips, Frankliniella fusca, which is a vector of Tospovirus, is a serious pest of tobacco, peanuts, and cotton in the United States. It was said that immigration of the adult thrips from weed hosts into crop fields is a cause of TSWV epidemy in the field. Recently this pest thrips was introduced into Japan. We investigated survival rate, developmental time, and fecundity of a Japanese strain of F. fusca on leaves of tobacco, peanut, and green bean at 18°C. Thrips could not complete larval development on 3 Nicotiana species, N. tabacum, N. gossei, and N. rustica. On the other hand, survival rate from hatching to adult emergence on peanut and green bean is 78% and 86%, respectively. A female adult thrips lived during about 25 days and deposited 101 eggs on green bean, but died within 10 days without ovipositing on Nicotiana spp. The tobacco is not a reproductive host plant that permits tobacco thrips to propagate, but an adult food source that is susceptible of TSWV.
Highlights
Tomato spotted wilt virus causes economic losses to many cultivated crops
Tomato spotted wilt virus (TSWV) is vectored exclusively by several thrips species, including the tobacco thrips, Frankliniella fusca, which are commonly observed on tobacco plants in USA [2] [3]
Cultures of F. fusca can be kept on green bean pods and whole green bean plant, [11] [12] [14]-[16]
Summary
Tomato spotted wilt virus (family Bunyauirdae, genus Tospovirus) causes economic losses to many cultivated crops. Tomato spotted wilt virus (TSWV) has a wide host range that includes several hundreds of plant species. TSWV is vectored exclusively by several thrips species, including the tobacco thrips, Frankliniella fusca, which are commonly observed on tobacco plants in USA [2] [3]. It was suggested that there is little potential for secondary spread of the virus for populations on tobacco plants. They suppose that adults of tobacco thrips immigrate into tobacco fields from weed host in early season [1] [9] [10]. We investigated suitability of tobacco plants as host plants of F. fusca in comparison with peanut and green bean, using leaf discs
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