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|Type:||Capítulo de livro|
|Title:||A Model Of Cellular Automata For The Spatial Analysis Of Aphids And Ladybugs|
de Barros L.C.
|Abstract:||In this chapter we have adopted the Cellular Automata model (CA) to study the dispersion of the aphids and ladybugs in the block of citric trees. The main aim of this investigation has been to develop a simple and specific methodology to study Citrus Sudden Death (CSD). CSD is a disease that has affected sweet orange trees grafted on Rangpur lime in the state of São Paulo - Brazil. Some studies suggest that this disease has been caused by a virus and it is transmitted by insects known as aphids (vector). The ladybug was selected among the most known enemies of aphids in citrus in Brazil. In order to elaborate a predator-prey type of model to study the interaction between aphids (preys) and ladybugs (predators) in citriculture we have used a fuzzy rule-based system (FRBS) . Qualitative information from specialists permit to propose rules that relate the state variables with their own variations. The states of the variables of the system (inputs) are the density of preys and the potentiality of predators and their variations are the outputs. To study the temporal evolution of the disease we have adopted a (CA) model. Therefore, we take into account the effect of he wind in the space covered by the aphid, since the wind is important for the flight of the aphid . Simulations were performed and compared between blocks with the presence of aphids and the absence of ladybugs, and the presence of both aphids and ladybugs. Numerical simulations allow us to foresee the behavior of the system, hence creating a spectrum of possibilities and proposing control techniques for different initial scenarios. After this introduction, the chapter proceeds as follows: Section 1 develops brief reviews of Citrus Sudden Death, Cellular Automata and the concept of fuzzy set and fuzzy rule-based system. Section 2 details cellular automata model. Simulations results are in Section 3. © 2011 Nova Science Publishers, Inc.|
|Editor:||Nova Science Publishers, Inc.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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