Leila Benfekih - Academia.edu (original) (raw)
Papers by Leila Benfekih
Biodiversitas, May 5, 2023
Natural Resources and Sustainable Development
AGROBIOLOGIA, Jun 30, 2017
AGROBIOLOGIA, Dec 30, 2017
Écologie Chimique: nouvelles contributions à la protection des cultures contre les ravageurs et 11e Conférence Internationale sur les Ravageurs et Auxiliaires en Agriculture, 24 au 26 octobre 2017, Montpellier, France, 2017
Acta agriculturae Slovenica
The aim of this study was to assess the effectiveness of the parasitoid Cales noacki Howard, 1907... more The aim of this study was to assess the effectiveness of the parasitoid Cales noacki Howard, 1907 (Hymenoptera, Aphelinidae) in the biological control of the citrus pest woolly whitefly, Aleurothrixus floccosus (Maskell,1896) in Northwestern Algeria. In particular the pest and parasitoid population fluctuations under different environmental conditions were investigated. The study was conducted by examination and sampling of whitefly adult populations on young shoots and catches as well as its parasitoid during a 12-month period by counting the parasite and infested-live larvae. Results showed remarkable variations in abundance indices and infestation rates of larvae and adults that depended on the growth flush in foliage and meteorological conditions of the region. The woolly whitefly manifested three flight periods coinciding with three growth flushes of orange sap; in autumn towards the end of September followed by mid-November with the highest average abundance of 10 individuals ...
Plants
Erigeron bonariensis and E. sumatrensis are two noxious weeds present in many parts of the world.... more Erigeron bonariensis and E. sumatrensis are two noxious weeds present in many parts of the world. Their tolerance to salinity and water deficit was analysed at the seed germination stage and during vegetative development. Seed germination was tested in solutions with different concentrations of NaCl and polyethylene glycol (PEG). Growth parameters, photosynthetic pigments, ion accumulation, and antioxidant mechanisms were analysed in plants that were subjected to increasing NaCl solutions, or severe water deficit by completely restricting irrigation. Seed germination was mostly affected by NaCl, but less by PEG in both species. E. bonariensis had a faster germination in all treatments and maintained a higher percentage of germination under the highest concentration of salt applied. Growth responses were similar in the two species, both being more affected by higher salt concentrations than by water deficit. The main differences in the responses of the two species to stress regard K+...
Soil Systems
Soil salinity represents one of the most restrictive environmental factors for agriculture worldw... more Soil salinity represents one of the most restrictive environmental factors for agriculture worldwide. In the present study, the salt tolerance of two weeds of the genus Amaranthus, A. albus and A. hybridus, the latter cultivated as green vegetable in Africa, were analysed. Both species showed a remarkable salt tolerance phenotype during germination and vegetative growth. To evaluate the percentage and rate of germination, seeds were germinated in Petri dishes in a germination chamber under increasing concentrations up to 300 mM NaCl. Higher concentrations of salt ranging from 150 to 600 mM NaCl were applied for one month to plants grown in individual pots in the greenhouse. All seeds of A. albus germinated in the control and almost half of the seeds under 200 mM NaCl, but only 4% of the seeds under 250 mM NaCl. In A. hybridus, germination was considerably lower in all treatments and was completely prevented at 250 mM NaCl. The plant growth of both species was severely affected by hi...
Sustainability, 2022
Natural herbicides based on essential oils (EOs) extracted from aromatic plants are gaining relev... more Natural herbicides based on essential oils (EOs) extracted from aromatic plants are gaining relevance in contemporary agriculture. Due to their allelopathic properties, they have an inhibitory effect on the germination and growth of different species, having, in general, the advantage of high specificity. For this reason, the analysis of the effects of these natural compounds on noxious weeds is continuously increasing. In the present study, three commercial EOs extracted from Mentha piperita L., Thymbra capitata (L.) Cav. and Santolina chamaecyparissus L. were tested on two invasive weeds with an increasing presence in southern Europe, Erigeron bonariensis L. and Araujia sericifera Brot. Five concentrations (0.125, 0.25, 0.50, 1 and 2 µL mL–1) were tested in a randomized manner for each essential oil and five replicates with 20 seeds each for E. bonariensis and 10 replicates with 10 seeds each for A. sericifera. Two higher concentrations of 4 and 8 μL mL–1 of the three EOs were app...
This study of diet and food preferences in the greg a ious phase of Dociostaurus maroccanus (THUM... more This study of diet and food preferences in the greg a ious phase of Dociostaurus maroccanus (THUMBERG, 1815), was carried out in the wild durin g the months of June and July 2010 in the region of Marhoum (State of Sidi Bel Abbes). The determination of the diet and food choice was m de by the method of faeces content analysis, which is based on the recognition of epidermises fragments of the consumed plants, using alight microscope. The results of this study show that D.maroccanus is a polyphagous species whose adult have a tendenc y to overconsume of Poaceae (Gramineae). Poaceae account for a large part in the diet of adult males and female s of the gregarious populations with over 60% of the total food spectru m, compared with the other consumed plant families which are very diverse but whose consumption frequencies are very low. Regardless of the plant species, males and fem ales show no specific food choices, especially in the consumptio n of Dicotyledons. Among Poaceae species, ...
AGROFOR, 2018
Agrochemicals are considered to be among the major environmental threats to pollinators, includin... more Agrochemicals are considered to be among the major environmental threats to pollinators, including honey bees. At the time of foraging, bees are at risk of exposure to phytosanitary treatment as a result of widespread treatment and their location, often near orchards. In Algeria, the majority of farmers systematically over-treat their orchards in order to have good quality fruits for as long as possible towards the use of an effective product. We evaluated the comparative effects of lambda-cyhalothrin and spinosad insecticide treatments on bees in tomato plots. Fluctuations of bee populations abundance were established during a 16 days period of exposure using yellow-colored plates with water placed every two days inside the experimental units. Bee populations showed very high sensitivity (0 individuals registered) to both insecticides at the homologated dose and even half dose during 10 days following application of the treatments. Depending on the estimated temporal toxicity of th...
Journal of Biotechnology, 2017
The study was conducted during four cycles of crop (spring, summer, autumn, winter) under greenho... more The study was conducted during four cycles of crop (spring, summer, autumn, winter) under greenhouse conditions. We used as experimental variants: culture on coconut and perlite substrates. Fertilization was done with chemical fertilizer (23 + 06 + 10) and a newly created organic fertilizer by USAMV Bucharest. This fertilizer is realized by biotechnological processing of wastes from stables and it is pending patent. Control variant consisted in chemical fertilization of plants. The best results were obtained at the organic fertilized variants, in both experiments. For the variants grown in January-May it has been observed a shortening of the vegetation season. Also, results showed nitrates content below standard limits. The results clearly show a favorable evolution of production and of quality plants grown with organic fertilizers. Furthermore, the new fertilizer offers the possibility of environmental protection.
Journal of Orthoptera Research, 2002
AGROBIOLOGIA, Jun 30, 2019
Biodiversitas, May 5, 2023
Natural Resources and Sustainable Development
AGROBIOLOGIA, Jun 30, 2017
AGROBIOLOGIA, Dec 30, 2017
Écologie Chimique: nouvelles contributions à la protection des cultures contre les ravageurs et 11e Conférence Internationale sur les Ravageurs et Auxiliaires en Agriculture, 24 au 26 octobre 2017, Montpellier, France, 2017
Acta agriculturae Slovenica
The aim of this study was to assess the effectiveness of the parasitoid Cales noacki Howard, 1907... more The aim of this study was to assess the effectiveness of the parasitoid Cales noacki Howard, 1907 (Hymenoptera, Aphelinidae) in the biological control of the citrus pest woolly whitefly, Aleurothrixus floccosus (Maskell,1896) in Northwestern Algeria. In particular the pest and parasitoid population fluctuations under different environmental conditions were investigated. The study was conducted by examination and sampling of whitefly adult populations on young shoots and catches as well as its parasitoid during a 12-month period by counting the parasite and infested-live larvae. Results showed remarkable variations in abundance indices and infestation rates of larvae and adults that depended on the growth flush in foliage and meteorological conditions of the region. The woolly whitefly manifested three flight periods coinciding with three growth flushes of orange sap; in autumn towards the end of September followed by mid-November with the highest average abundance of 10 individuals ...
Plants
Erigeron bonariensis and E. sumatrensis are two noxious weeds present in many parts of the world.... more Erigeron bonariensis and E. sumatrensis are two noxious weeds present in many parts of the world. Their tolerance to salinity and water deficit was analysed at the seed germination stage and during vegetative development. Seed germination was tested in solutions with different concentrations of NaCl and polyethylene glycol (PEG). Growth parameters, photosynthetic pigments, ion accumulation, and antioxidant mechanisms were analysed in plants that were subjected to increasing NaCl solutions, or severe water deficit by completely restricting irrigation. Seed germination was mostly affected by NaCl, but less by PEG in both species. E. bonariensis had a faster germination in all treatments and maintained a higher percentage of germination under the highest concentration of salt applied. Growth responses were similar in the two species, both being more affected by higher salt concentrations than by water deficit. The main differences in the responses of the two species to stress regard K+...
Soil Systems
Soil salinity represents one of the most restrictive environmental factors for agriculture worldw... more Soil salinity represents one of the most restrictive environmental factors for agriculture worldwide. In the present study, the salt tolerance of two weeds of the genus Amaranthus, A. albus and A. hybridus, the latter cultivated as green vegetable in Africa, were analysed. Both species showed a remarkable salt tolerance phenotype during germination and vegetative growth. To evaluate the percentage and rate of germination, seeds were germinated in Petri dishes in a germination chamber under increasing concentrations up to 300 mM NaCl. Higher concentrations of salt ranging from 150 to 600 mM NaCl were applied for one month to plants grown in individual pots in the greenhouse. All seeds of A. albus germinated in the control and almost half of the seeds under 200 mM NaCl, but only 4% of the seeds under 250 mM NaCl. In A. hybridus, germination was considerably lower in all treatments and was completely prevented at 250 mM NaCl. The plant growth of both species was severely affected by hi...
Sustainability, 2022
Natural herbicides based on essential oils (EOs) extracted from aromatic plants are gaining relev... more Natural herbicides based on essential oils (EOs) extracted from aromatic plants are gaining relevance in contemporary agriculture. Due to their allelopathic properties, they have an inhibitory effect on the germination and growth of different species, having, in general, the advantage of high specificity. For this reason, the analysis of the effects of these natural compounds on noxious weeds is continuously increasing. In the present study, three commercial EOs extracted from Mentha piperita L., Thymbra capitata (L.) Cav. and Santolina chamaecyparissus L. were tested on two invasive weeds with an increasing presence in southern Europe, Erigeron bonariensis L. and Araujia sericifera Brot. Five concentrations (0.125, 0.25, 0.50, 1 and 2 µL mL–1) were tested in a randomized manner for each essential oil and five replicates with 20 seeds each for E. bonariensis and 10 replicates with 10 seeds each for A. sericifera. Two higher concentrations of 4 and 8 μL mL–1 of the three EOs were app...
This study of diet and food preferences in the greg a ious phase of Dociostaurus maroccanus (THUM... more This study of diet and food preferences in the greg a ious phase of Dociostaurus maroccanus (THUMBERG, 1815), was carried out in the wild durin g the months of June and July 2010 in the region of Marhoum (State of Sidi Bel Abbes). The determination of the diet and food choice was m de by the method of faeces content analysis, which is based on the recognition of epidermises fragments of the consumed plants, using alight microscope. The results of this study show that D.maroccanus is a polyphagous species whose adult have a tendenc y to overconsume of Poaceae (Gramineae). Poaceae account for a large part in the diet of adult males and female s of the gregarious populations with over 60% of the total food spectru m, compared with the other consumed plant families which are very diverse but whose consumption frequencies are very low. Regardless of the plant species, males and fem ales show no specific food choices, especially in the consumptio n of Dicotyledons. Among Poaceae species, ...
AGROFOR, 2018
Agrochemicals are considered to be among the major environmental threats to pollinators, includin... more Agrochemicals are considered to be among the major environmental threats to pollinators, including honey bees. At the time of foraging, bees are at risk of exposure to phytosanitary treatment as a result of widespread treatment and their location, often near orchards. In Algeria, the majority of farmers systematically over-treat their orchards in order to have good quality fruits for as long as possible towards the use of an effective product. We evaluated the comparative effects of lambda-cyhalothrin and spinosad insecticide treatments on bees in tomato plots. Fluctuations of bee populations abundance were established during a 16 days period of exposure using yellow-colored plates with water placed every two days inside the experimental units. Bee populations showed very high sensitivity (0 individuals registered) to both insecticides at the homologated dose and even half dose during 10 days following application of the treatments. Depending on the estimated temporal toxicity of th...
Journal of Biotechnology, 2017
The study was conducted during four cycles of crop (spring, summer, autumn, winter) under greenho... more The study was conducted during four cycles of crop (spring, summer, autumn, winter) under greenhouse conditions. We used as experimental variants: culture on coconut and perlite substrates. Fertilization was done with chemical fertilizer (23 + 06 + 10) and a newly created organic fertilizer by USAMV Bucharest. This fertilizer is realized by biotechnological processing of wastes from stables and it is pending patent. Control variant consisted in chemical fertilization of plants. The best results were obtained at the organic fertilized variants, in both experiments. For the variants grown in January-May it has been observed a shortening of the vegetation season. Also, results showed nitrates content below standard limits. The results clearly show a favorable evolution of production and of quality plants grown with organic fertilizers. Furthermore, the new fertilizer offers the possibility of environmental protection.
Journal of Orthoptera Research, 2002
AGROBIOLOGIA, Jun 30, 2019