Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/316150
Type: TESE
Title: Estudos ecologicos e patologicos da proliedrose nuclear de Alabama argillacea (Hubner, 1818) (Lepidoptera; Noctuidae)
Author: Andrade, Carlos Fernando Salgueirosa de, 1954-
Advisor: Habib, Mohamed Ezz El-Din Mostafa, 1942-
Habib, Mohamed E. M.
Abstract: Resumo: No presente trabalho foi detectada e avaliada a ocorrência natural da virose poliedro-nuclear (VPN) em populações de Alabama argillacea (curuquerê do algodão), nas regiões de Campinas/SP e Mogi-Guaçú/SP. Os parasitos de A. argillacea principalmente os Tachinidae, mostraram ter papel fundamental na dispersão do vírus e na manutenção da doença. Tais parasitos, junto com outros fatores bióticos de mortalidade determinaram altos níveis de controle natural dessa praga. No laboratório, quando infectadas experimentalmente, as larvas de A. argillacea mostraram uma típica seqüência de sinais patológicos, caracterizada por várias etapas. O tempo de duração das fases pré-mortais dependeu de vários fatores como dose, idade e condições pré-infecção. Os estudos histopatológicos revelaram alterações a nível dos órgãos, tecidos e células, nas larvas infectadas pelo vírus. Tais alterações resultaram nas disfunções e degenerações observadas determinando a morte do inseto. Os tecidos mais afetados foram: adiposo, epiderme, matriz traqueal e sistema nervoso. Nucleocapsídeos sem envelope (297,54 por 63,07 nm) citoplasmas das células infectadas. Os com envelope (311,35 por 102,02 nm) foram encontrados somente nos núcleos. Poliedros em formação, estromas virais e elemento fibrilares também foram detectados nas células atacadas. Poliedros desenvolvidos (1,6?um'm de diâmetro) foram abundantes na hemolinfa e tecidos decompostos das larvas mortas pela doença... Observação: O resumo, na íntegra, poderá ser visualizado no texto completo da tese digital
bstract: Natural occurence of NPV in populations of Alabama argillacea was detected and evaluated several times, during the present work, in cotton fields (Campinas, SP. and Mogi-Gúaçú,SP) and laboratory. Some entomophagous insects, principally tachinid parasites, was shown to have an important role as agents responsible for disperssion and maintenance of the virus. Populations of this insect pest suffered high natural mortalities due to the combined action of entomophagous insects and pathogen. Typical symptoms caracterized by morphological and behavioral alterations were described. The duration of different pre-mortal stages varied according to dose, age and stress conditions. System, tissues and cells suffered disturbances, disintegration and total mal-function resulting in death to the infected larvae. Nervous system, fat tissue, epidermal cells and tracheal matrix suffered more effects than in other sites. Nucleocapsids, as well as polyhedra, were measured in purified material and its presence in the diseased cells was detected. Some physiological disturbances were evaluated through responses of ocelli as well as fore-gut activities in diseased larvae, utilizing electrographic records. The activities of these two organs in infected larvae, when compared with healthy ones, was significantly associated with many external symptoms. The susceptibility tests revealed how the response of the larvae to the pathogen is related to many factors, such as dose, age and experimental conditions. Within the modern criteria of insect pest control, it is suggested that NPV of A. argillacea could be easily utilized in integrated control of this insect species
Subject: Algodão - Doenças e pragas
Language: Português
Editor: [s.n.]
Date Issue: 1981
Appears in Collections:IB - Tese e Dissertação

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