Invasive Species Compendium

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Abstract Full Text

Spontaneous vegetation in the Horticultural Belt of La Plata hosting Thripidae (Thysanoptera) Tospovirus vectors: relative risk as an epidemiological component.

Abstract

The Tomato Spotted Wilt Virus (TSWV) is a thrips transmitted virus and a complex problem since weeds are hosts of the vectors and also of the virus, then those plant species may act as reservoir and vector support. The objective was to obtain, from a list of weeds previously known as hosts of the four vector thrips species in the La Plata horticultural belt, a categorization of relative risk as epidemiological component. Between 2000 and 2003, three sites were selected within the horticultural belt of La Plata (Buenos Aires, Argentina), where samples (total=60) were collected from flowers of 21 weeds, known as hosts of Frankliniella occidentalis, Frankliniella schultzei, Frankliniella gemina and Thrips tabaci. For their analysis, the results of the samplings were grouped in three annual seasons, in correspondence with the phenology of the greenhouse crops in the region. For the four species of thrips known as vectors, were considered the adult abundance and the presence of their larvae. It was cluster analysis, hierarchical and unsupervised, and then the DGC multivariate means test, were used to obtain the number of significant groups. From this early grouping, three risk groups (RG) were defined as a source of inoculum of these vectors: high (H), medium (M) and low (L), according to their previously known status as reproductive hosts (RH). The groups that emerged were: (H): RH of F. occidentalis, (M): RH of F. schultzei and T. tabaci, and (L): RH of F. gemina or RH of non-vector thrips. The proposal focuses on the periodic survey and early suppression of flowering of nine weed species categorized as RG (H). This involves the continuous survey of three species of weeds, to which are added other companions according to the growing season.