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On-line version ISSN 1678-8052
ALVES, Everaldo B.; CASARIN, Nádia F.B. and OMOTO, Celso. Dispersal mechanisms of Brevipalpus phoenicis (Geijskes) (Acari: Tenuipalpidae) in citrus groves. Neotrop. Entomol. [online]. 2005, vol.34, n.1, pp. 89-96. ISSN 1678-8052. http://dx.doi.org/10.1590/S1519-566X2005000100013.
The knowledge of pest dispersal is crucial for understanding the dynamics of resistance to pesticides. Therefore, the main objective of this research was to study the dispersal of Brevipalpus phoenicis (Geijskes) under laboratory, greenhouse and citrus groves conditions. Dispersal studies of B. phoenicis on sandy surface conducted under greenhouse conditions showed that dispersal capacity by crawling is relatively limited. After the release of 6,000 mites in one point, approximately 3% reached distances of 40 to 50 cm from the release point. This mite moved less than 1 cm.day-1. Wind speed of 23 km.h-1 was not enough to trigger mite dispersal from the surface of citrus fruits under laboratory conditions. Wind speeds of 30 and 40 km.h-1 were capable to trigger the dispersal of less than 1% of mites on fruits. Mite dispersal studies with the use of sticky traps under field conditions also showed that B. phoenicis dispersal is limited when compared to other mite species from citrus groves. In this experiment, from a total of 2,420 and 661 mites collected from each of two citrus fields in Descalvado, region, State of São Paulo, Brazil, 0.4 and 11.8% of the mites belonged to the family Tenuipalpidae. The limited dispersal of B. phoenicis requires considerable attention in the establishment of acaricide resistance management strategies.
Keywords : Leprosis mite; acaricide resistance; aerial dispersal.