Neotropical Entomology (2004) 33, 613-617

Sheila A. Mourão, Júlio C.T. Silva, Raul N.C. Guedes, Madelaine Venzon, Gulab N. Jham, Claudinei L. Oliveira and José C. Zanuncio (2004)
Seletividade de extratos de nim (Azadirachta indica A. Juss.) ao ácaro predador Iphiseiodes zuluagai (Denmark and Muma) (Acari: Phytoseiidae)
[Selectivity of neem extracts (Azadirachta indica A. Juss.) to the predatory Mite Iphiseiodes zuluagai (Denmark and Muma) (Acari: Phytoseiidae)]
Neotropical Entomology 33 (5), 613-617
Abstract: The relative toxicity of the leaf, seed and oil neem cake extracts of Azadirachta indica A. Juss (neem) to the predatory mite Iphiseiodes zuluagai (Denmark and Muma) (Acari: Phytoseiidae) was evaluated. To verify the relative toxicity of these extracts on the predatory mite, discriminating concentrations of the extracts were determined for adult females of Oligonychus ilicis (McGregor) (Acari: Tetranychidae), through the method of concentration-mortality. Coffee leaf disks with 3.5 cm of the diameter were put floating on water and impregnated with dry residue of the extracts. Concentrations of neem extracts which caused mortality (99%) of O. ilicis, after 72h of exposition, were 277.4; 520.9 e 10.9 mg/ml for leaf, seed and oil neem cake, respectively. The discriminating concentration of extract of oil neem cake for O. ilicis females was highly toxic to I. zuluagai; while extract of leaf and seed were selective to the predatory mite.

A toxicidade relativa dos extratos de folha, semente e óleo de torta de Azadirachta indica A. Juss (nim) ao ácaro predador Iphiseiodes zuluagai (Denmark and Muma) (Acari: Phytoseiidae) foi estudada em laboratório. Foram determinadas concentrações discriminatórias (CLs99) dos extratos de folha, semente e óleo de torta de nim para fêmeas adultas de Oligonychus ilicis (McGregor) (Acari: Tetranychidae), através de bioensaios de concentração-mortalidade. Arenas com 3,5 cm de diâmetro, confeccionadas com folhas de cafeeiro flutuando em água, foram impregnadas com resíduo seco dos extratos e usadas para se estimar a seletividade ao ácaro I. zuluagai. As concentrações dos extratos de nim que mataram 99% de O. ilicis, após 72h de exposição foram: 277,4; 520,9 e 10,9 mg/ml, para folha, semente e óleo de torta, respectivamente. A concentração discriminatória do extrato de óleo de torta de nim para fêmeas adultas de O. ilicis foi altamente tóxica ao ácaro I. zuluagai, as dos extratos de folha e de semente foram seletivos.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Raul Narciso C. Guedes, José Cola Zanuncio, Gulab Newandram Jham

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
health/environmental effects of pesticides
Research topic(s) for beneficials or antagonists:
resistance to pesticides

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Oligonychus ilicis	Coffee (Coffea)	Brazil (south)
Iphiseiodes zuluagai (predator)	Oligonychus ilicis	Coffee (Coffea)	Brazil (south)