El objetivo de este trabajo fue analizar el marco político institucional en el que se desarrolla ... more El objetivo de este trabajo fue analizar el marco político institucional en el que se desarrolla la Extensión Universitaria. Se analizaron las políticas de extensión que implementa la UNLP y la Facultad de Ciencias Naturales y Museo. Si bien en ambas instituciones se observaron acciones concretas para fomentar su desarrollo, la falta de jerarquización impide que esta función de la educación superior sea financiada y adquiera la dimensión que merece. La ausencia de materias formativas curriculares que orienten y sustenten dicha práctica y el papel protagónico del programa de incentivos docentes, con la figura del “docente-investigador”, representan uno de los principales obstáculos que impiden el crecimiento de este pilar de la educación superior. Aún así, los datos empíricos indican que existe una tendencia hacia el incremento de las propuestas de proyectos de extensión.The aim of this work is to analyze the institutional and political framework in which the University Extension wor...
The aim of this work is to introduce different theoretical and educational approaches by which ru... more The aim of this work is to introduce different theoretical and educational approaches by which rural Extension can be conceived. In this case, these approaches are then applied to make a self-criticism of the carried out extension activities. We see that we often reproduce old practices of Extension, without obtaining the appropriation of the knowledge by producers. For this it is necessary to generate a space of greater communicative interaction through the establishment of dialog relationships, subject to subject, which will take to the integration of scientific and local knowledge.
The aim of this work is to analyze the institutional and political framework in which the Univers... more The aim of this work is to analyze the institutional and political framework in which the University Extension works. For this purpose, the politics of the Extension Department of the UNLP and the Natural Sciences and Museum College were analyzed. Though concrete actions to promote its development were observed in both institutions, the lack of hierarchy prevents this function of superior education from acquiring the dimension that it deserves. The absence of courses orienting and supporting these practices in the formative curricula together with the protagonist role of the educational incentives’ program, and its “investigator-teacher” figure, represent one of the main obstacles which impede the growth of this pillar of superior education. Nevertheless, the empiric data indicate a tendency toward the increase of the extension projects.
Revista de la Sociedad Entomológica Argentina, 2014
We report for the first time from Argentina Typhlodromus ( Anthoseius ) transvaalensis Nesbitt f... more We report for the first time from Argentina Typhlodromus ( Anthoseius ) transvaalensis Nesbitt from Capsicum annuum L. and Lycopersicum esculentum L. (Solanaceae) in Concordia, Entre Rios. Morphometric parameters of Argentine specimens are provided.
Neoseiulus californicus (MG) is a phytoseiid that can provide biological control of Tetrany... more Neoseiulus californicus (MG) is a phytoseiid that can provide biological control of Tetranychus urticae Koch. The effectiveness of phytoseiids for biological control depends on different attributes including their ability to survive conditions of food shortage. Newly N. californicus copulated females were singly introduced into an arena for 10 days and were either provided with or deprived of food (all stages of T. urticae) during the first 48 or 96h. Food deprivation reduced adult survival (control: 100%, 48h: 83% and 96h: 62.5%) and the proportion of reproducing females, while the pre-reproductive period increased with increasing starvation. The number of offspring produced by females of age x that effectively laid eggs after the periods of starvation was not significantly different from the control in all cases they levelled at approximately 2.9 eggs per reproducing female. Expressing the mean number of eggs laid per female in physiological age (days after starvation), differences were observed in the second and third days denoting the effect of starvation in the fecundity recovery period. The net reproduction rate during the first 10 days of adulthood was 18.22, 8.91 and 1.95 female eggs/female/10 days, for the control, the 48 and the 96h starvation treatments, respectively. The overall effect of food deprivation was mainly due to a reduction in adult survivorship and in the proportion of reproducing females. The negative effect on the net reproductive rate during the first 10 days of adulthood could reduce the capacity of N. californicus to prevent population increases of T. urticae in the short-term. Notwithstanding, this effect would be mitigated because this predator is capable of feeding on alternate food sources such as pollen, different mites and insect eggs.
Revista De La Sociedad Entomologica Argentina, Jun 1, 2014
Primer registro de Typhlodromus (Anthoseius) transvaalensis (Acari: Phytoseiidae) de la Argentina... more Primer registro de Typhlodromus (Anthoseius) transvaalensis (Acari: Phytoseiidae) de la Argentina RESUMEN. Se cita por primera vez de la Argentina a Typhlodromus (Anthoseius) transvaalensis Nesbitt (Acari: Phytoseiidae) sobre Capsicum annuum L. y Lycopersicum esculentum L. (Solanaceae) en la localidad de Concordia, Entre Ríos. Se proporcionan datos morfométricos de los ejemplares argentinos.
Trophic breadth niche, prey preference and developmental time of an unidentified Balaustium sp. (... more Trophic breadth niche, prey preference and developmental time of an unidentified Balaustium sp. (Acari: Erythraeidae) were studied under laboratory conditions. The prey offered consisted of immature and adult stages of Tetranychus urticae Koch, Bemisia tabaci (Gennadius), Frankliniella occidentalis (Pergande) and Macrosiphum euphorbiae (Thomas). The breadth of the trophic niche increased as mites developed. All active stages of Balaustium sp . consumed more than one kind of prey. Adults were the most generalist while larvae can be considered oligophagous. Larval instar significantly selected T. urticae eggs, deutonymphs substantially chose whiteflies, and thrips nymphs and adults were non-selective, eating any type of prey they could catch. Details of the development of the different stages are provided.
Argentina has over 100 years of experience in classical biological control, mostly based on the i... more Argentina has over 100 years of experience in classical biological control, mostly based on the importation of biological control agents (BCAs) against arthropod pests. We present the state-of-the-art of the importation regulatory framework from the last 30 years to date. We also applied a part of a recent developed environmental risk assessment (ERA) methodology to analyze retrospectively the potential negative effects on non-target species of 15 BCAs (12 parasitoids and three predators) imported since 1996 in Argentina, supported by the published literature (Tier 1 Scoping Assessment and Tier 2 Screening Assessment). We demonstrated that the previously imported species could have negative effects on nontarget species [Adverse Effect risk characterization [ 5 for ERA categories 2 (Reduction of native natural enemies), 3 (Reduction in herbivory) and 4 (Reduction in valued species)], which would be worth evaluating with a Definitive Assessment (Tier 3) and field research to determine if any were actually occurring. We discuss some suggestions for government organizations, state officials and decision makers, scientific researchers, and biological control practitioners to improve the current evaluation for the introduction of new BCAs into Argentina.
A redescription of adults of Lasioseius cynari Chant, 1963 is presented based on the examination ... more A redescription of adults of Lasioseius cynari Chant, 1963 is presented based on the examination of paratype specimens deposited at the Canadian National Collection of Insects and Arachnids, Canada and on specimens from Argentina. The paratype specimens originated from Italy were collected from globe artichokes (Cynara scolymus L.) and the specimens from Argentina were collected from the same host and from artichoke thistle (Cynara cardunculus L.), both Asteraceae. This is the first report of this species after its original description, and a new host record of this species on C. cardunculus.
Revista de la Sociedad Entomológica Argentina, 2021
The association between the ectoparasitic mite, Erythraeus Latreille (Acari: Prostigmata: Parasit... more The association between the ectoparasitic mite, Erythraeus Latreille (Acari: Prostigmata: Parasitengona) and the psyllid Russelliana adunca Burckhardt (Hemiptera: Psylloidea) is reported for the first time. Larval erythraeid mites are not common on psyllids, therefore this first report adds a new host association and widens the distribution of the mite in South America.
El objetivo de este trabajo fue analizar el marco político institucional en el que se desarrolla ... more El objetivo de este trabajo fue analizar el marco político institucional en el que se desarrolla la Extensión Universitaria. Se analizaron las políticas de extensión que implementa la UNLP y la Facultad de Ciencias Naturales y Museo. Si bien en ambas instituciones se observaron acciones concretas para fomentar su desarrollo, la falta de jerarquización impide que esta función de la educación superior sea financiada y adquiera la dimensión que merece. La ausencia de materias formativas curriculares que orienten y sustenten dicha práctica y el papel protagónico del programa de incentivos docentes, con la figura del “docente-investigador”, representan uno de los principales obstáculos que impiden el crecimiento de este pilar de la educación superior. Aún así, los datos empíricos indican que existe una tendencia hacia el incremento de las propuestas de proyectos de extensión.The aim of this work is to analyze the institutional and political framework in which the University Extension wor...
The aim of this work is to introduce different theoretical and educational approaches by which ru... more The aim of this work is to introduce different theoretical and educational approaches by which rural Extension can be conceived. In this case, these approaches are then applied to make a self-criticism of the carried out extension activities. We see that we often reproduce old practices of Extension, without obtaining the appropriation of the knowledge by producers. For this it is necessary to generate a space of greater communicative interaction through the establishment of dialog relationships, subject to subject, which will take to the integration of scientific and local knowledge.
The aim of this work is to analyze the institutional and political framework in which the Univers... more The aim of this work is to analyze the institutional and political framework in which the University Extension works. For this purpose, the politics of the Extension Department of the UNLP and the Natural Sciences and Museum College were analyzed. Though concrete actions to promote its development were observed in both institutions, the lack of hierarchy prevents this function of superior education from acquiring the dimension that it deserves. The absence of courses orienting and supporting these practices in the formative curricula together with the protagonist role of the educational incentives’ program, and its “investigator-teacher” figure, represent one of the main obstacles which impede the growth of this pillar of superior education. Nevertheless, the empiric data indicate a tendency toward the increase of the extension projects.
Revista de la Sociedad Entomológica Argentina, 2014
We report for the first time from Argentina Typhlodromus ( Anthoseius ) transvaalensis Nesbitt f... more We report for the first time from Argentina Typhlodromus ( Anthoseius ) transvaalensis Nesbitt from Capsicum annuum L. and Lycopersicum esculentum L. (Solanaceae) in Concordia, Entre Rios. Morphometric parameters of Argentine specimens are provided.
Neoseiulus californicus (MG) is a phytoseiid that can provide biological control of Tetrany... more Neoseiulus californicus (MG) is a phytoseiid that can provide biological control of Tetranychus urticae Koch. The effectiveness of phytoseiids for biological control depends on different attributes including their ability to survive conditions of food shortage. Newly N. californicus copulated females were singly introduced into an arena for 10 days and were either provided with or deprived of food (all stages of T. urticae) during the first 48 or 96h. Food deprivation reduced adult survival (control: 100%, 48h: 83% and 96h: 62.5%) and the proportion of reproducing females, while the pre-reproductive period increased with increasing starvation. The number of offspring produced by females of age x that effectively laid eggs after the periods of starvation was not significantly different from the control in all cases they levelled at approximately 2.9 eggs per reproducing female. Expressing the mean number of eggs laid per female in physiological age (days after starvation), differences were observed in the second and third days denoting the effect of starvation in the fecundity recovery period. The net reproduction rate during the first 10 days of adulthood was 18.22, 8.91 and 1.95 female eggs/female/10 days, for the control, the 48 and the 96h starvation treatments, respectively. The overall effect of food deprivation was mainly due to a reduction in adult survivorship and in the proportion of reproducing females. The negative effect on the net reproductive rate during the first 10 days of adulthood could reduce the capacity of N. californicus to prevent population increases of T. urticae in the short-term. Notwithstanding, this effect would be mitigated because this predator is capable of feeding on alternate food sources such as pollen, different mites and insect eggs.
Revista De La Sociedad Entomologica Argentina, Jun 1, 2014
Primer registro de Typhlodromus (Anthoseius) transvaalensis (Acari: Phytoseiidae) de la Argentina... more Primer registro de Typhlodromus (Anthoseius) transvaalensis (Acari: Phytoseiidae) de la Argentina RESUMEN. Se cita por primera vez de la Argentina a Typhlodromus (Anthoseius) transvaalensis Nesbitt (Acari: Phytoseiidae) sobre Capsicum annuum L. y Lycopersicum esculentum L. (Solanaceae) en la localidad de Concordia, Entre Ríos. Se proporcionan datos morfométricos de los ejemplares argentinos.
Trophic breadth niche, prey preference and developmental time of an unidentified Balaustium sp. (... more Trophic breadth niche, prey preference and developmental time of an unidentified Balaustium sp. (Acari: Erythraeidae) were studied under laboratory conditions. The prey offered consisted of immature and adult stages of Tetranychus urticae Koch, Bemisia tabaci (Gennadius), Frankliniella occidentalis (Pergande) and Macrosiphum euphorbiae (Thomas). The breadth of the trophic niche increased as mites developed. All active stages of Balaustium sp . consumed more than one kind of prey. Adults were the most generalist while larvae can be considered oligophagous. Larval instar significantly selected T. urticae eggs, deutonymphs substantially chose whiteflies, and thrips nymphs and adults were non-selective, eating any type of prey they could catch. Details of the development of the different stages are provided.
Argentina has over 100 years of experience in classical biological control, mostly based on the i... more Argentina has over 100 years of experience in classical biological control, mostly based on the importation of biological control agents (BCAs) against arthropod pests. We present the state-of-the-art of the importation regulatory framework from the last 30 years to date. We also applied a part of a recent developed environmental risk assessment (ERA) methodology to analyze retrospectively the potential negative effects on non-target species of 15 BCAs (12 parasitoids and three predators) imported since 1996 in Argentina, supported by the published literature (Tier 1 Scoping Assessment and Tier 2 Screening Assessment). We demonstrated that the previously imported species could have negative effects on nontarget species [Adverse Effect risk characterization [ 5 for ERA categories 2 (Reduction of native natural enemies), 3 (Reduction in herbivory) and 4 (Reduction in valued species)], which would be worth evaluating with a Definitive Assessment (Tier 3) and field research to determine if any were actually occurring. We discuss some suggestions for government organizations, state officials and decision makers, scientific researchers, and biological control practitioners to improve the current evaluation for the introduction of new BCAs into Argentina.
A redescription of adults of Lasioseius cynari Chant, 1963 is presented based on the examination ... more A redescription of adults of Lasioseius cynari Chant, 1963 is presented based on the examination of paratype specimens deposited at the Canadian National Collection of Insects and Arachnids, Canada and on specimens from Argentina. The paratype specimens originated from Italy were collected from globe artichokes (Cynara scolymus L.) and the specimens from Argentina were collected from the same host and from artichoke thistle (Cynara cardunculus L.), both Asteraceae. This is the first report of this species after its original description, and a new host record of this species on C. cardunculus.
Revista de la Sociedad Entomológica Argentina, 2021
The association between the ectoparasitic mite, Erythraeus Latreille (Acari: Prostigmata: Parasit... more The association between the ectoparasitic mite, Erythraeus Latreille (Acari: Prostigmata: Parasitengona) and the psyllid Russelliana adunca Burckhardt (Hemiptera: Psylloidea) is reported for the first time. Larval erythraeid mites are not common on psyllids, therefore this first report adds a new host association and widens the distribution of the mite in South America.
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