Articulos

1. Dinámica de la Biomasa y Productividad Primaria Aérea Neta de un Pastizal de "Flechillas" de Sierra de la Ventana (Buenos Aires, Argentina). J.L. Frangi, N.E. Sánchez, M.G. Ronco, G.S. Rovetta y R.L. Vicari. Bol. Soc. Arg. Bot. Vol. XIX (1-2): 203-228. 1980.

2. Efecto del fuego sobre la composición y dinámica de la biomasa de un pastizal de Sierra de la Ventana (Buenos Aires, Argentina). J.L. Frangi, M.G. Ronco, N.E. Sánchez, R.L. Vicari y G.S. Rovetta. Darwiniana, Vol. 22 (4) : 565-585. 1980.

3. Variaciones estacionales de la fauna de Acrídidos en un pastizal sucesional de la Provincia de Buenos Aires (Argentina). N.E. Sánchez. Rev. Soc. Entomol. Argent. 39 (3 4): 227-234. 1980.

4. Estimación de atributos poblacionales en Laplatacris dispar Rehn (Orthoptera: Acrididae). N.E. Sánchez. Neotrópica, 26 (76): 247-256. 1980.

5. Estudio preliminar sobre la selectividad alimentaria en especies de Acridios de la Provincia de Buenos Aires (Argentina).R.A. Ronderos, M.O. Arriaga y N.E. Sánchez. Rev. Soc. Entomol. Argent. 40 (1 4): 73 82. 1981.

6. Análisis preliminar de las variaciones numéricas de una población de Laplatacris dispar Rehn (Orthoptera: Acrididae). G.G. ¬Liljesthröm y N.E. Sánchez. Rev. Soc. Entomol. Argent. 41 (1 4): 141 146. 1982.

7. Revisión del género Propedies Hebard (Orthoptera, Acrididae, Melanoplinae). R. A. Ronderos y N.E. Sánchez. Rev. Soc. Entomol. Argent. 42 (1 4):171 218. 1983.

8. Estimación del daño causado por Acridios en pasturas naturales. I. Reducción de forraje debida a Dichroplus pratensis Bruner. N.E. Sánchez y M. L. de Wysiecki. Rev. Soc. Entomol. Argent. 42 (1 4):243 250. 1983.

9. Population Dynamics of Laplatacris dispar (Rehn) (Orthoptera: Acrididae). N.E. Sánchez y G.G. Liljesthröm. Environ. Entomol. 15:775 778. 1986.

10. Differences in post diapause thermal requirements for eggs of two rangeland grasshoppers. W.P. Kemp y N.E. Sánchez. Can. Entomol. 119: 653 661. 1987.

11. Fecundity of Melanoplus sanguinipes (F.) in two crested wheatgrass pastures. N.E. Sánchez, J.A. Onsager y W.P. Kemp. Can. Entomol. 120: 29 37. 1988.

12. Life history parameters in Melanoplus sanguinipes (F.) in two crested wheatgrass pastures. N.E. Sánchez y J.A. Onsager. Can. Entomol. 120: 39 44. 1988.

13. Quantitative evaluation of feeding activity of the grasshopper Dichroplus pratensis Bruner (Orthoptera: Acrididae) in a natural grassland. N.E. Sánchez y M.L. de Wysiecki. Environ. Entomol. 19 (5): 1392 1395. 1990.

14. Distribución de huevos de Epinotia aporema (Lepidoptera, Tortricidae) dentro de la planta de soja. P.C. Pereyra, N.E. Sánchez y M.V.Gentile. Ecología Austral Vol.1, No.1. 1991.

15. Relación entre las preferencias de oviposición de la hembra y los sitios de alimentación de la larva en Epinotia aporema (Lepidoptera, Tortricidae). N. E. Sánchez, P.C. Pereyra y M.V. Genti¬le. Ecología Austral Vol.1, No. 1. 1991.

16. Dieta y remoción de forraje producida por Dichroplus pratensis Bruner (Orthoptera, Acrididae) en un pastizal de la Provincia de La Pampa, Argentina. M.L. de Wysiecki y N.E. Sánchez. Ecología Austral Vol.2:19 27. 1992.

17. Abundancia y diversidad de Acridios (Orthoptera : Acrididae) en pasturas de la provincia de La Pampa, Argentina. N.E. Sánchez y M.L. de Wysiecki. RIA, 24 (1): 29-39. 1993.

18. Effects of Dipterous parasitoids on reproduction of Melanoplus sanguinipes (Orthoptera: Acrididae). N. E. Sánchez y J.A. Onsager. J. Orth. Res. No. 3: 65-68. 1994.

19. Life tables of the soybean looper Rachiplusia nu (Guenee) (Lepidoptera: Noctuidae) in the laboratory. N.E. Sánchez y P.C. Pereyra. Rev. Soc. Entomol. Argent. 54(1-4). 1995.

20. Predación de larvas de Epinotia aporema (Lepidoptera : Tortricidae) por Polybia scutellaris (Hymenoptera : Vespidae). G. G. Liljesthröm, N.E. Sánchez y M.V. Gentile. RIA, 26 (2): 45-50. 1995.

21. Efecto de la calidad del alimento en la tucura Dichroplus pratensis (Orthoptera: Acrididae). Pereyra, P.C., N.E. Sánchez y M.L. de Wysiecki. Rev. Fac. Agron. 101(2): 169-178. 1996.

22. Population parameters of Epinotia aporema (Lepidoptera: Tortricidae) on soybean. N.E. Sánchez, P. C. Pereyra y M. V. Gentile. Rev. Soc. Entomol. Argent. 56 (1-4): 151-153. 1997.

23. Life history parameters of the gregarious phase of the South American locust, Schistocerca cancellata (Serville) (Orthoptera : Acrididae), under laboratory conditions. N.E. Sánchez, E. Wittenstein, M.L. de Wysiecki y C.E. Lange. J. Orth. Res. 6: 121-124. 1997.

24. Effects of different host -plant species on growth, development and feeding of the bud borer, Epinotia aporema (Lepidoptera, Tortricidae) in La Plata, Argentina. P.C. Pereyra y N.E. Sánchez. Rev. Chil. de Historia Natural 71 No. 3. 1998.

25. Susceptibilidad de la langosta Schistocerca cancellata (Orthoptera: Acrididae) a Nosema locustae (Protozoa: Microspora), en laboratorio. C.E. Lange, E. Wittenstein y N.E. Sánchez. Rev. Fac. Agron. 103 (2). 1998.

26. Spatial distribution and coincidence of Neoseiulus californicus and Tetranychus urticae (Acari : Phytoseiidae, Tetranychidae) on strawberry. N. M. Greco, G. G. Liljesthröm y N. E. Sánchez. Exp. Appl. Acarol. 23 (7): 567-580. 1999.

27. Composición específica y abundancia de la comunidad de Lepidópteros defoliadores de la soja en el noroeste de Buenos Aires, Argentina. M.G. Luna y N.E. Sánchez. Rev. Soc. Entomol. Argent. 58 (3-4): 1-2. 1999.

28. Parasitoid assemblages of soybean defoliator Lepidoptera in north-western Buenos Aires province, Argentina. M.G. Luna y N.E. Sánchez. Agricultural and Forest Entomology 1: 255-260. 1999.

29. Effect of the pathogen Nosema locustae (Protozoa: Microspora) on mortality and development of nymphs of the South American locust, Schistocerca cancellata (Orthoptera: Acrididae). C.E. Lange, N.E. Sánchez and E. Wittenstein. J. Orth. Res. 9: 77-80. 2000.

30. Grassland and shrubland grasshopper community composition in northern La Pampa province, Argentina. M.L. de Wysiecki, N.E. Sánchez and S.E. Ricci. J. Orth. Res. 9: 211-221. 2000.

31. Aspectos biológicos y demografía de Dichroplus schulzi Bruner (Orthoptera, Acrididae), en laboratorio. N.E. Sánchez, P. Pessacq, M. Theiller y G. Almandoz. Rev. Soc. Entomol. Argent. 60 (1-4): 73-78. 2001.

32. Effect of tomato leaf hairiness on functional and numerical response of Neoseiulus californicus (Acari: Phytoseiidae). C. V. Cédola, N. E. Sánchez & G. G. Liljesthröm. Exp. Appl. Acarol. 25: 819-831. 2001.

33. Effects of previously damaged strawberry plants on Tetranychus urticae Koch (Acari: Tetranychidae). N.M. Greco and N.E. Sánchez. Acarologia XLIIII, 1 : 59-65. 2003.

34. Effect of tomato pubescence on development, survival and fecundity of Tetranychus urticae Koch and Neoseiulus californicus (McGregor) (Acari: Tetranychidae: Phytoseiidae). C. Cédola & N. Sánchez. Acarologia XLIIII, 3: 255-260. 2003.

35. Neoseiulus californicus (Acari: Phytoseiidae) as a potential control agent of Tetranychus urticae (Acari: Tetranychidae): effect of pest/predator ratio on pest abundance on strawberry. N. M. Greco, N. E. Sánchez & Gerardo G. Liljesthröm. Exp. Appl. Acarol. 37: 57-66. 2005.

36. Effect of Two Solanaceous Plants on Development and Population Parameters of the Tomato Leaf Miner, Tuta absoluta (Meyrick) (Lepidoptera, Gelechiidae). P.C. Pereyra & N.E.Sánchez. Neotropical Entomology 35 (5): 671-676. 2006.

37. Parasitism of Tuta absoluta (Lepidoptera, Gelechiidae) by Pseudapanteles dignus (Hymenoptera, Braconidae) under Laboratory Conditions. M.G. Luna, N.E. Sánchez & P. C. Pereyra. Environ. Entomol. 36(4): 887-893. 2007.

38. Spatial patterns of parasitism of the solitary parasitoid Pseudapanteles dignus (Muesebeck) (Hymenoptera: Braconidae) on the tomato leafminer Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). N.E. Sánchez, P. C. Pereyra & M.G. Luna. Environ. Entomol. 38(2): 365-374. 2009.

39. Impact of glyphosate on the development, fertility and demography of Chrysoperla externa (Neuroptera: Chrysopidae): Ecological Approach. Schneider, M.I.; Sanchez, N.; Pineda, S.; Chi, H. and A. Ronco. Chemosphere (en prensa).

CAPITULOS DE LIBROS

1. Bases ecológicas para un manejo racional de plagas. G.G. Liljesthröm y N.E. Sánchez. En: Goin, J.; C. Goñi y M. Cate­lén (Ed.)­. Bases para una política ambiental de la R. Argentina. 1993. Sec­ción III, H.C. Diputados de la Pcia. de Buenos Aires.

2. Principios de manejo de plagas en una agricultura sustentable. N.M. Greco, N.E. Sánchez y P.C. Pereyra. En: Agroecología. El camino hacia una agricultura sustentable. ISBN 987-9486-03-X.  Cap. 13. Págs. 251-274. S. Sarandón (Editor). Ediciones Científicas Americanas, La Plata, Argentina. 560 pp.  2002.

3. Control biológico por conservación de enemigos naturales. N. Sánchez y N. Greco.  En Ecología y Ambiente. ISBN 987-21270-0-X. Págs. 178-182. 216 pp. Malacalza, L. (editor). Publicación del Instituto de Ecología de Luján. 2004.

4. Parasitism of Lepidoptera defoliators in sunflower and legume crops, and adjacent vegetation in the Pampas of Argentina. Sánchez, N. & M.G. Luna. Encyclopedia of Entomology. ISBN 0-7923-8670-1. Vol. 3. Págs. 1634-1639. Kluwer Academic Publishers, The Netherlands. 2004.

5. Grasshoppers of the argentine Pampas. N. Sánchez. & M.L. de Wysiecki.  Encyclopedia of Entomology. ISBN 0-7923-8670-1. Vol. 2. Págs. 1017-1019. Kluwer Academic Publishers, The Netherlands. 2004.

6. Neotropical soybean budborer, Crocidosema aporema (Walsingham, 1914) (Lepidoptera, Tortricidae). N. Sánchez & P. Pereyra. Encyclopedia of Entomology. ISBN 0-7923-8670-1. Vol. 2. Págs 1545-1547. Kluwer Academic Publishers, The Netherlands. 2004.

7. Biological control by Neoseiulus californicus (McGregor) (Acari: Phytoseiidae). Encyclopedia of Entomology.  N. Sánchez, N. Greco & C. Cédola. Encyclopedia of Entomology. ISBN 0-7923-8670-1. Vol.1. Págs. 303-304. Kluwer Academic Publishers, The Netherlands. 2004.

TRABAJOS DE DIVULGACION

1. Manejo de la arañuela roja (Tetranychus urticae) en cultivos de frutilla del cinturón hortícola de La Plata. Greco, N.M.; N.E. Sánchez y G.G. Liljesthröm. En: Plagas y enfermedades en manejo orgánico, una mirada latinoamericana.  D. Foguelman compiladora y editora. Ediciones IFOAM en  castellano y en inglés, Buenos Aires. 104 pp. 2003.

2. Greco, N.M. y N.E. Sánchez. El problema de las plagas en la agricultura. Rev. Consejo Profesional de Ciencias Naturales de la prov. de Bs. As. Año 1- No. 1. 2004.

Ultimas Incorporaciones

RESEARCH ACCOMPLISHMENTS

I am a Research Leader at La Plata University and CONICET, Argentina. As entomologist, my main interest is the area of pest insect population biology and ecology using different approaches. I have also conducted investigations in community ecology, looking at the structure of different pest and parasitoid insect assemblages. Many of these research projects have been conducted in collaboration with other colleagues or Ph. D. students of my research group. At present, I am particularly interested in the study of bottom-up, top-down and tritrophic interactions with the aim to improve current pest management. PAST RESEARCH

1. Biology and ecology of grasshopper populations We studied the biology traits and demography of different species of grasshoppers from Argentina and the US grasslands, under field and laboratory conditions

2. Grassland and shrubland grasshopper community composition in La Pampa province, Argentina. Grasshopper species composition, diversity and abundance on five grasslands and shrublands in northern La Pampa province were determined.

3. Biology and ecology of soybean pest populations. We studied the mean developmental time of the different stages and population parameters of the budborer Crocidosema aporema (Lepidoptera, Tortricidae) on soybean and other legumes, and the defoliator Rachiplusia nu (Lepidoptera, Noctuidae), two of the major soybean pests in Argentina. The parasitoid assemblage structure of soybean defoliator Lepidoptera in northwestern Buenos Aires province, was studied determining parasitoid species composition, richness, number of guilds per host species, and levels of parasitism.

4. Mite predator-prey interaction We studied mite predator-prey interaction in two tomato and strawberry crops in La Plata (Buenos Aires, Argentina), to evaluate the possibility of biological control by conservation techniques. In strawberry crops Tetranychus urticae (Acari, Tetranychidae) is a major pest and Neoseiulus californicus (Acari, Phytoseiidae) is the most important established predator. It is a promising established natural enemy for controlling T. urticae on strawberry. However, in tomato, leaf hairiness negatively affected survival, fecundity, T. urticae searching efficiency and consumption’s efficiency of this predator, prevented it from exhibiting a strong numerical response. This result shows the need to consider plant attributes as an essential and interactive component of biological control practices.

5. Parasitism of Tuta absoluta (Lepidoptera, Gelechiidae) by Pseudapanteles dignus (Hymenoptera, Braconidae) under field and laboratory conditions. Laboratory studies were conducted to determine life history traits and the functional response of the parasitoid P. dignus, a major enemy of T. absoluta in tomato crops in South America. P. dignus showed a type I functional response within the range of host densities tested. We studied the pattern of parasitism of T. absoluta by the parasitoid, at three scales on tomato crops: plant, leaf and leaflet, in a horticultural region, in La Plata, Argentina. Field percentages of parasitism ranged from 17.06 to 45.95 %. Parasitoid aggregation in relation to host density was found at leaf and leaflet scales. However, the proportion of parasitized hosts was independent of host density. The variability of parasitism rates exhibited at the three spatial scales seems to result in partial refuges for the host, which might contribute to the stability of the interaction between host and parasitoid.

CURRENT AND FUTURE RESEARCH

1. Conservation biological control of Tetranychus urticae by Neoseiulus californicus : Effect of different alternative food and refuge on the performance of the predator. We are investigating the spatial and temporal availability of food and refuge that may be critical determinants of whether, when, or how the predator N. californicus survives and performs in the agroecosystem. The objective is to develop a conservation biological control plan for T. urticae using the predator N. californicus through habitat management techniques.

2. Ecological studies for the biological control of Tuta absoluta (Lepidoptera, Gelechiidae) in La Plata region (Buenos Aires, Argentina). The aim of this study is to evaluate the potential of two larval parasitoids (Hymenoptera) of natural presence in tomato crops of this region, for the biological control of Tuta absoluta, in tomato. We are determining the potential growth and the oviposition behaviour of the koinobiont Pseudapanteles dignus under laboratory and field conditions and the competence with the idiobiont Dineulophus phthorimaeae.

3. Effect of transgenic soybean crop on the community of pests and natural enemies. The purpose is to detect the effect of transgenic soybean introduction and expansion on the community of pests and natural enemies. For doing so, we are comparing previous samplings of these species in no- transgenic soybean from 80’ and 90’ decades to actual samplings on transgenic soybean of the same area, in Buenos Aires province. We are determining the specific diversity, abundance, the effect of feeding on both types of soybean on the performance of different species, and the ecotoxicological effect of glyphosate on some important predators.