21 Oca 2025 Salı
Lethal effects of therapeutic plant extracts against rose aphid, Macrosiphum rosae (L.) (Hemiptera: Aphididae)
Abstract :The present study assayed the aphidicidal activity of five medicinal plant viz. Artemisia absinthium (Asterales: Asteraceae), Euphorbia helioscopia (Malpighiales: Euphorbiaceae), Iris germanica (Asparagales: Iridaceae), Mentha longifolia (Lamiales: Lamiaceae) and Viola odorata (Malpighiales: Violaceae) against rose aphid, Macrosiphum rosae (Linnaeus, 1785). The high reproductive capabilities of this pest species enables to develop resistance against the frequently used chemical insecticides. In the present study, aqueous extracts of these plant species were prepared and in vitro evaluation of lethal effect was carried out by no choice bioassay employing leaf dip technique at three different concentrations. For comparison, leaves treated with distilled water served as control for prepared extracts. The data was subjected to One- way ANOVA and the results revealed that all treatment concentrations varied significantly than untreated control by Duncan’s test at 5%. Furthermore, the extracts illustrated an extensive spectrum of aphidicidal activity with E. helioscopia extract inflicting highest mortality with lowest LC50. The order of toxicity of plant extracts was recorded as Mentha< Viola < Artemisia< Iris< Euphorbia. Thus, it can be concluded that these plant extracts can be developed as bio- pesticides against this intensifying nuisance of rose aphids without any major apprehension about the environmental conditions.
Aphidicidal activity, plant extracts, rose aphid, no choice bioassay, bio-pesticides