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1 March 2014 Soil Quality Influences Efficacy of Melia azedarach (Sapindales: Meliaceae), Fruit Extracts Against Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)
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Abstract

Hexane extract of chinaberry, Melia azedarach L., unripe fruits obtained from different municipalities of Goiás State, Brazil, were evaluated on the southern cattle tick, Rhipicephalus (Boophilus) microplus (Canestrini), engorged females. Hexanic extracts were assayed in decreasing concentrations from 0.25 to 0.0156% to determine effects on egg production and hatching. Efficacy on engorged females decreased as a result of the extracts from Goiânia (100%), Professor Jamil (97.5 ± 3.0%), Pirenópolis (95.1 ± 2.4%), Morrinhos (86.8 ± 9.4%), Caturaí (41.8 ± 29.3%), and Bela Vista de Goiás (17.1 ± 0.9%) municipalities. Canonical redundancy analysis indicated that the extract bioactivity was positively correlated with soil Ca2 , Mg2 , and P and negatively correlated with silt, K , potential acidity, and organic matter. This study demonstrates that M. azedarach hexanic extract can dramatically reduce R. (B.) microplus reproductive capacity and that efficacy is strongly influenced by differences in soil constituents between collection sites.

Lorena A. D. De Sousa, Deomar P. Da Costa, Pedro H. Ferri, Allan T. Showler, and Lígia M. F. Borges "Soil Quality Influences Efficacy of Melia azedarach (Sapindales: Meliaceae), Fruit Extracts Against Rhipicephalus (Boophilus) microplus (Acari: Ixodidae)," Annals of the Entomological Society of America 107(2), 484-489, (1 March 2014). https://doi.org/10.1603/AN13167
Received: 23 October 2013; Accepted: 1 December 2013; Published: 1 March 2014
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