A Survey of Tospoviruses in Bulgaria

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Abstract
A survey of tospoviruses present in Bulgaria was conducted during three vegetation periods. A total of 258 different virus isolates were obtained from tobacco, tomato, weeds and ornamentals in the open fields and from glasshouses. Virus isolates were identified by inoculation to test plants and serology as Tomato spotted wilt virus (TSWV). No indications were obtained that other Tospovirus species were present in Bulgaria. In addition the transmission ability and efficiency of several Bulgarian populations of Thrips tabaci (Lind.) and Frankliniella occidentalis (Perg.) was determined. The experimental results indicated that Bulgarian TSWV isolates are transmitted with high efficiency by F. occidentalis and that only arrhenotokous and not thelytokouse populations of T. tabaci could transmit TSWV.

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