Abstract

GONZALEZ, M.F et al. Estudios preliminares de la perla de la vid Margarodes vitis (hemiptera: margarodidae) en viñedos de La Consulta, Mendoza, Argentina. RIA. Rev. investig. agropecu. [online]. 2016, vol.42, n.2, pp.161-167. ISSN 1669-2314.

The ground pearl, Margarodes vitis (Philippi), is a subterranean sucking plant insect that feeds on the roots of Vitis vinifera. Damages are shown as a progressive decline, causing the death of the plant. Study of insect spatial patterns provides critical information to implement an Integrated Pest Management program. The aim of this study was to determine the lifecycle, symptoms related plants insect-number / kg soil and spatial pattern of the insect. Twice a month samplings were carried out, between September 2012 to March 2013 in La Consulta, Mendoza.The samples were processed in laboratory and the number of cysts / 1000 g soil was registered. Females and eggs, but not first instar nymphs were observed from late November to early January. Several dispersion indexes were applied .The a and b coefficients of Taylor's Power Law and á and â of the Iwao´s Regression coefficients were also estimated. Always, M. vitis showed an aggregate pattern. An analysis of Spearman´s correlation coefficient showed that significant differences (P< 0.0001) occurred between number of cysts and damage scale. This information is useful to develop sampling plans and control strategies.

Keywords : Population dynamics; Spatial pattern; Taylor´s Power Law; Spearman´s coefficient; Iwao´s Regression.

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