Short communication. Insecticidal activity of different extracts of Rhamnus dispermus (Rhamnaceae) against peach trunk aphid, Pterochloroides persicae (Homoptera: Lachnidae)

Abstract

Bark of Rhamnus dispermus Ehrenb (Rhamnaceae) was collected from Ash-Shoubak, Jordan, and extracted with hexane, chloroform, acetone and ethanol, respectively. The aim of this study was to test the insecticidal activity of these extracts against the peach trunk aphid (PTA), Pterochloroides persicae (Homoptera: Lachnidae), since it has been shown that Rhamnus spp. may contain compounds that can act as botanical pesticides. Three concentrations (100, 1000, and 10,000 ppm) of each dry extract were obtained by dissolving the dry extract in 0.01% solution of dimethyl sulfoxide (DMSO). Results showed that, at the highest concentration (10,000 ppm), all the extracts caused mortality in the PTA adults after 24 h of exposure. Both the acetone and ethanol extracts showed higher mortality (69 and 71%, respectively) than the hexane and chloroform extracts (40 and 56%, respectively) after 72 h of exposure at the highest concentration. In comparison, the synthetic control, Imidacloprid, killed 93% of the PTA adults. Nevertheless, extracts from R. dispermus provided valuable mortality rates for the PTA and can be used as botanical insecticides as part of the integrated pest management programs of this insect pest.Additional key words: anthraquinones, botanical insecticide, flavonoids, IPM. ResumenComunicación corta. Actividad insecticida de diferentes extractos de Rhamnus dispermus (Rhamnaceae) contra el pulgón negro de la madera, Pterochloroides persicae (Homoptera: Lachnidae)Dado que Rhamnus spp. puede contener compuestos que actúen como pesticidas botánicos, se recolectó corteza de Rhamnus dispermus Ehrenb (Rhamnaceae) en Ash-Shoubak, Jordania, y se prepararon extractos de hexano, cloroformo, acetona y etanol, para analizar su actividad insecticida contra el pulgón negro de la madera (PTA), Pterochloroides persicae (Homoptera: Lachnidae). Se prepararon tres concentraciones de cada extracto seco (100, 1000, y 10.000 ppm) disolviendo cada extracto seco en soluciones dimetilsulfóxido (DMSO) al 0,01%. En la concentración máxima (10.000 ppm), todos los extractos produjeron mortalidad a los adultos de PTA después de 24 h de exposición. A las 72 h de exposición, los extractos de acetona y etanol a 10.000 ppm produjeron una mayor mortalidad (69 y 71%, respectivamente) que los extractos de hexano y cloroformo (40 y 56%, respectivamente). En comparación, el control sintético Imidacloprid produjo la muerte del 93% de los adultos de PTA. Sin embargo, los extractos de R. dispermus producen una mortalidad apreciable en los PTA y pueden ser utilizados como insecticidas botánicos como parte de los programas de manejo integrado de esta plaga.Palabras clave adicionales: antraquinonas, flavonoides, insecticida botánico, IPM.Abbreviations used: df (degrees of freedom), DMSO (dimethyl sulfoxide), IPM (integrated pest management), LSD (least significant difference), ppm (parts per million), PTA (potato trunk aphid).* Corresponding author: ateyyat@bau.edu.jo Received: 31-03-08. Accepted: 02-12-08. Insecticidal activity of Rhamnus dispermu...

Impact of Flavonoids against Woolly Apple Aphid, Eriosoma lanigerum (Hausmann) and Its Sole Parasitoid, Aphelinus mali (Hald.)

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Identification of two entomopathogenic fungi naturally infecting Pterochloroides persicae (Cholodkovsky 1899) (Hemiptera, Aphididae) in peach orchards in Tunisia

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<b>The invasive aphid <I>Pterochloroides persicae</I> (Cholodkovsky, 1899) (Hemiptera: Aphidoidea: Lachninae) recorded on important fruit trees in Kashmir Valley, India</b>

“…(almond, apricot, peach) and Citrus species (Ciampolini et al 1997). The species is well documented with distributional records available for many regions (Blackman & Eastrop 1994;Ateyyat & Abu-Darwish 2009;Knowledge Bank-Plantwise 2015). The species is persistent (Liotta & Maniglia 1993), serious (Kairo & Poswal 1995), invasive (Ciampolini et al 1997;Bounfour et al 2005) with distributional records suggesting gradual extension towards the eastern Mediterranean and central Asia (Kairo & Poswal 1995).…”