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Articles by Lamya Ahmed Al-Keridis
Total Records ( 2 ) for Lamya Ahmed Al-Keridis
  Abdel-Raheem, M.A. and Lamya Ahmed Al-Keridis
  Background and Objective: Bemisia tabaci (B. tabaci) is the most widespread insect pest of broad range of greenhouse and field crops. It is a serious threat to crop production due to direct damage. The aim of this study was to study the virulence of three entomopathogenic fungi against Whitefly, Bemisia tabaci. Materials and Methods: This study was carried out during 2 successive seasons (2015 and 2016). In this study trading compounds of entomopathogenic fungi, Bio magic (Metarhizium anisopliae), Bio power (Beauveria bassiana) and Bio catch (Verticillium lecanii) were used. Three concentrations were used (1×107, 1×108 and 1×109 spores mL–1). Data were analyzed by one-way analysis of variance and followed by a least significant difference (LSD at 5%, p>0.05). Results: Under laboratory conditions V. lecanii, B. bassiana and M. anisopliae mortalities were happened after 3 days from treatment. The maximum percent of mortality (100%) was occurred after the 6th day from treatment with the 3rd concentration in all isolates. The 3rd concentration (1×109 spores mL–1) was the highly toxic in V. lecanii, B. bassiana and M. anisopliae to the adult of B. tabaci compared with the other two concentrations. Under field conditions the 3rd concentration (1×109) also was the best concentration against whitefly after the third application in V. lecanii, B. bassiana and M. anisopliae. The percent of reduction was ranged between 52 and 100% in all concentrations. V. lecanii was more virulence than B. bassiana and M. anisopliae against B. tabaci. Conclusion: These results confirmed that V. lecanii, B. bassiana and M. anisopliae isolates are promising agents for whitefly control in the field.
  Rania Ali El Hadi Mohamed , Souheila Nagmouchi , Lamya Ahmed Al-Keridis and Rebai Benammar
  Background and Objective: Chemical insecticides have some limitations in vectors control such as the emergence of resistance in vector mosquitoes to conventional synthetic insecticides. It aimed to evaluate the larvicidal efficacy and phytochemical potential of Azadirachta indica, Cymbopogon citratus and Allium sativum L. against Culex quinquefasciatus fourth instar larvae. Materials and Methods: The plants were screened and evaluated for their phytochemical composition and larvicidal effects on C. quinquefasciatus larvae. Results: The bioassay results showed that the effects were dependent on time and concentration of the extract used. Results showed the least lethal dose value for ethanolic extract of C. citrates (72 h exposure) and the highest value for aqueous extract of A. indica (24 h exposure). Chi-square values were significant at p<0.05. Phytochemical analysis showed phytochemicals such as alkaloids, flavonoids, cardiac glycosides and resins in all the three plants. However, tannins were absent in A. indica and A. sativum, while balsam was only present in A. indica. Saponins, balsam and phenols were not found in A. sativum. Phenols were also absent in C. citratus. Terpenes, steroids and resins were absent A. indica. Conclusion: Findings of this study revealed that these herbal extracts constitute an effective eco-friendly approach for the control of C. quinquefasciatus larvae.
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