Bulletin of Entomological Research (2015) 105, 381-389

J.F. Rosado, M.C. Picanço, R.A. Sarmento, R.M. Pereira, M. Pedro-Neto, T.V.S. Galdino, A. de Sousa Saraiva and E.A.L. Erasmo (2015)
Geostatistics as a tool to study mite dispersion in physic nut plantations
Bulletin of Entomological Research 105 (4), 381-389
Abstract: Spatial distribution studies in pest management identify the locations where pest attacks on crops are most severe, enabling us to understand and predict the movement of such pests. Studies on the spatial distribution of two mite species, however, are rather scarce. The mites Polyphagotarsonemus latus and Tetranychus bastosi are the major pests affecting physic nut plantations (Jatropha curcas). Therefore, the objective of this study was to measure the spatial distributions of P. latus and T. bastosi in the physic nut plantations. Mite densities were monitored over 2 years in two different plantations. Sample locations were georeferenced. The experimental data were analyzed using geostatistical analyses. The total mite density was found to be higher when only one species was present (T. bastosi). When both the mite species were found in the same plantation, their peak densities occurred at different times. These mites, however, exhibited uniform spatial distribution when found at extreme densities (low or high). However, the mites showed an aggregated distribution in intermediate densities. Mite spatial distribution models were isotropic. Mite colonization commenced at the periphery of the areas under study, whereas the high-density patches extended until they reached 30 m in diameter. This has not been reported for J. curcas plants before.
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Link to article at publishers website
Database assignments for author(s): Renato Almeida Sarmento, Roberto M. Pereira, Marcelo Coutinho Picanco

Research topic(s) for pests/diseases/weeds:
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Polyphagotarsonemus latus	Jatropha (crop)
	Tetranychus bastosi	Jatropha (crop)