Abstract
Amblyseius tamatavensis has been reported from over 20 countries around the world, and is also widely distributed in Brazil. It has been reported as potentially useful for the control of Bemisia tabaci, a pest/vector insect of great economic importance worldwide. Some studies have reported some biological differences among phytoseiid populations. The objective of this work was to compare 14 populations of different regions of Brazil (from the states of Alagoas, Goiás, Minas Gerais and São Paulo; straight line distance between northern and southern extremes of 2,560 km) in relation to the predation and oviposition potential when fed with eggs of B. tabaci biotype B. The morphological characterization of these mites showed that the population from Olhos d'Agua das Flores (Alagoas state) and a population from mixed origin maintained in the laboratory for about 5 years were constituted by mites with larger dorsal and ventrianal shield dimensions and presented the highest rates of daily predation (respectively 7.9 and 7.0 eggs/ female) and oviposition (1.2 and 1.1 eggs/ female). A positive and significant relationship was observed between mean population predation and oviposition rates. The results suggest that subsequent efforts should focus on exploring the variability of mites of these two populations in relation to predation and oviposition potential, in order to select a new, more promising population to control B . tabaci biotype B.
Highlights
Introduction1995; de Barro et al 2011; Lourenção et al 2015) and transmitting about 128 plant viruses (Hogenhout et al 2008)
The measurements of the 14 populations are compatible to those reported in the original description (Blommers 1974) of A. tamatavensis
The differences observed are compatible with the expected intraspecific variation of a continuous structure, suggested by Tixier (2012) to be ca. 20% around the average for the phytoseiids
Summary
1995; de Barro et al 2011; Lourenção et al 2015) and transmitting about 128 plant viruses (Hogenhout et al 2008) The control of this pest/ vector is mainly performed using pesticides. There is a growing concern about maintaining or improving the quality of agricultural products and environment, searching for less harmful methods for controlling pests, including biological control. In this context, some predatory mites of the family Phytoseiidae have been used for the biological control of B. tabaci (Calvo et al 2015)
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