Assessment of toxicity on the basis of total phenolic content in oleander leaves (Nerium oleander L.) against Myzus persicae (Sulzer, 1776) (Hemiptera: Aphididae)

Abstract

<p><em></em><em>Nerium oleander</em> is an evergreen flowering shrub or small tree distributed widely in the Mediterranean region. It is also a source of polyphenols and cardenolides ?? with insecticidal effect which could be a safe alternative of chemical control of insect pests. In the present work, five concentrations (0 %, 1 %, 2.5 %, 5 %, and 10 %) of ethanolic extract from <em>Nerium oleander </em>leaves<em> </em>were evaluated for its insecticidal effect against 3 to 4 days old <em>Myzus persicae </em>individuals under laboratory conditions. Obtained results showed a significant insecticidal effect with 70 % of mortality at the highest concentration (10 %). Total phenolic content of leaf ethanolic extract of this plant was 1721.36 mg gallic acid equivalent 100 g<sup>-1</sup> dry matter. The results obtained suggest that we could make bioinsecticides based on leaves ethanolic extracts from <em>N. oleander</em> which rich in polyphenols for use eventually in integrated pest management.</p>

Effects of different industrial cannabis (Cannabis sativa (Linnaeus 1753) (Cannabaceae)) genotype extracts on Diuraphis noxia Kurdjumov, 1913 Myzus persicae Sulzer, 1776 and Aphis fabae Scopoli, 1763 (Hemiptera: Aphididae)

“…Yadav and Patel (2018) There are also many different studies associated with the effectiveness of extracts from different plants against these pest species. For instance, Czerniewicz et al (2018) tested the toxic effects of plant essential oils obtained from Santolina chamaecyparissus, Achillea millefolium, Tanacetum vulgare, Tagetes patula, and Artemisia absinthium on M. persicae and found LC 50 values of 0.34%, 0.34%, 0.47%, 0.61% and 0.69%, respectively, after 24 h. The ethanol extract of Nerium oleander with a 10% concentration showed 70% mortality on M. persicae nymphs (Nia et al, 2018). Mohmed (2019) indicated that Carissa macrocarpa extract, caused the toxic effect at 46.6% on A. fabae.…”