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Evaluation of natural products irradiated for the control of Blattella germanica (L.) (Dictyoptera: Blattellidae)



Evaluation of natural products irradiated for the control of Blattella germanica (L.) (Dictyoptera: Blattellidae)



Arquivos do Instituto Biologico Sao Paulo 71(4): 485-492



This study aimed to evaluate the effects of irradiated aqueous, hexanic and ethanolic extracts of Solanum paniculatum, Dahlia pinnata, Lycopersicon esculentum, Nephrolepis pectinata, Ruta graveolens, Ficus elastica, Lavandula angustifolia, Rhododendron simsii, Agave angustifolia, Ocimum basilicum, Coffea arabica and Hibiscus rosa-sinensis in order to identify new substances for integrated pest management (IPM) and to observe possible effects of gamma-radiation such as increase, reduction, activation and inactivation of the extracts for pest control. The effects of the extracts were evaluated by ingestion in Blattella germanica. For irradiation, an experimental irradiator of Cobalt-60 type Gammacell 220 was used. The natural products were submitted to increasing doses of gamma-radiation: 2.5, 5.0, 7.5 and 10.0 kGy. The results showed that gamma-radiation increased the efficiency of the ethanol extract of D. pinnata at a dose of 7.5 kGy, showing 48.0% efficiency on B. germanica nymphs. Gamma-radiation showed adverse effects on the aqueous extract of Ruta graveolens by decreasing its efficiency of 20.0 to 2.0% at doses of 2.5, 7.5 and 10.0 kGy, and to 4.0% at a dose of 5.0 kGy. Based on these results, it is concluded that gamma-radiation interferes with the behaviour of natural products for pest control and it can result in the increase, decrease, activation and inactivation of the extracts.

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