Local and systemic effect of azadirachtin on host choice and feeding activity of Macrosiphum rosae on rose plants

Abstract Many studies in the last decades addressed antifeedant and repellent effects of neem ( Azadirachta indica )-based pesticides on arthropod herbivores with azadirachtin as leading active ingredient. However, results for aphids regarding repellence feeding were often contradictory mainly based laboratory self-made extracts high concentrations. Moreover, no data are available presence phloem treated plants—the tissue that most feed on. We investigated how application commercial product NeemAzal-T/S onto only one plant half (upper or lower) affects nymphs aphid Macrosiphum rosae clip cages untreated half. Results mortality indicate ingredients translocated both upwards downwards rose plants transported phloem. Furthermore, we whether has a effect M. . A choice test greenhouse well quantification honeydew excretion electrical penetration graph analysis do not show differences settling NeemAzal-T/S-treated plants. Collectively, our approved concentrations is toxicity after plants, starvation.