author(s)
Asmaa S Ali and Mahmoud F Ali

abstract
An investigation was carried out to evaluate the ingestion toxicity of some plant extracts of nine different species, belonging to seven families against workers of Paratrechina longicornis. Plant species were Allium sativum, Anethum graveolens, Calendula officinalis, Coriandrum sativum, Eucalyptus citriodora, Mentha viridis, nigella sativa, Rosmarinus officinalis, and Trigonella foenum-graecum. It was found that E. citriodora was the most potent one towards workers followed with A. graveolens, then M. viridis, N. sativa, T. foenum-graecum, R. officinalis, C. officinalis, A. sativum, and C. sativum, respectively. Mortality depends mainly upon the type of plant species as well as the increase of the plant extract concentration and the increase of the time of exposure. Eucalyptus citriodora was the most potent plant, recording the lowest LC₅₀ and LC₉₀ which were 33.1% and 74.1%, respectively. On the other hand, C. sativum showed the least toxicity as the dose of LC₅₀ and LC₉₀ recorded 371.5% and 3801.9%, respectively. The longest average survival period (S50) occurred with A. sativum and C. sativum recording 10 days for each, whereas the shortest one recorded 3 days with E. citriodora, compared to 22 days for control.