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| Registros recuperados: 155 | |
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| Silva,Alexandre de Almeida e; Varanda,Elenice Mouro; Rassini,Joaquim Bartolomeu. |
| It is important to understand the effects of weather, insect density and plant cultivar on insect abundance to predict and prevent crop production loss. The present work investigated the influence of such factors on aphid in alfalfa during one year (short term). Data was collected from September/1997 to August/1998 at Canchin Farm (CCPSE-EMBRAPA), São Carlos, State of São Paulo, Brazil. Weather conditions had, in general, little effect on the variation of aphid populations, but Therioaphis maculata abundance was negatively correlated to humidity. Moreover, high maximum temperatures and low levels of rainfall possible favored T. maculata high abundance on Crioula and P3 cultivars. Therefore, appropriate management of this species is required during hot and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbivory; Hemiptera; Medicago sativa; Resistance; Population dynamics. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052007000200012 |
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| Leite,Germano Leão Demolin; Picanço,Marcelo; Jham,Gulab Newandran; Marquini,Flávio. |
| The objective of this study was to determine the effect of height of leaves in the canopy of plants, leaf organic compounds, concentrations of leaf nitrogen and potassium, leaf trichomes and cristalliferous idioblasts densities on the attack intensity of three tomato (Lycopersicon esculentum Mill. cv. Santa Clara) crops by Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae) and Liriomyza spp. (Diptera: Agromyzidae), under field conditions. The experimental design was arranged in randomized blocks, with three replications, each being one tomato crop. Analysis of variance and the Tukeys multiple range test (5% significance) were used to test the effect of canopy height, trichome and cristalliferous idioblasts densities on the number of mines produced by T.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Tomato; Population dynamics; Tomato leafminer; Terpenes. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542004000100005 |
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| Huigen, Marco G. A.; Leiden University; mhuigen@uni-hohenheim.de; Overmars, Koen P.; Leiden University; overmars@cml.leidenuniv.nl; de Groot, Wouter T.; Leiden University; degroot@cml.leidenuniv.nl. |
| Land-use system dynamics and demographic dynamics are tightly coupled. In environmental science and studies of changes in land use and land cover, an unequivocal relationship is sometimes found between both systems, especially in coarse-scale studies. To obtain a better understanding of these intermingling dynamics, we formulated an agent-based model, the MameLuke settlement model, that used a deductive approach to investigate these relationships. The model was constructed based on ethnographic histories of farm households in San Mariano, the Philippines. The model was calibrated visually. Although this calibration approach proved to be very inefficient, the model itself still outperformed a random model. The model formulation process and the model... |
| Tipo: Peer-Reviewed Reports |
Palavras-chave: Actor decision-making; Agent-based models; Ethnic distribution; Ethnographic history; Land-use dynamics; Mameluke framework; Philippines; Population dynamics. |
| Ano: 2006 |
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| Registros recuperados: 155 | |
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