Fatores determinantes ao ataque dos pulgões Brevicoryne brassicae, Lipaphis erysimi e Myzus persicae ao repolho

• Ano de defesa: 2010
• Autor(a) principal: Morais, Elisangela Gomes Fidelis de
• Orientador(a): Picanço, Marcelo Coutinho
• Banca de defesa: Reis, Marcelo Rodrigues dos , Guedes, Nelsa Maria Pinho
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Entomologia
• Departamento: Ciência entomológica; Tecnologia entomológica
• País: BR
• Palavras-chave em Português: Tabela de vida ecológica; Dinâmica populacional; Elementos climáticos; Syrphidae; Coccinellidae
• Palavras-chave em Inglês: Ecological life tables; Population dynamic; Climactic elements; Syrphidae; Coccinellidae
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOSSANIDADE::ENTOMOLOGIA AGRICOLA
• Link de acesso: http://locus.ufv.br/handle/123456789/873

Aphids Brevicoryne brassicae, Lipaphis erysimi e Myzus persicae (Hemiptera: Aphididae) are importants cabbage pests. Determintation of factors wich affect the population dynamic of pest and their critical life stages and mortality key factors is fundamental for planing of strategies and tactics management of these organisms. The In this research aimed to: (1) identify the critical life stages and mortality key factors of cabbage aphids, through ecological life tables of these insects; and (2) determinate the effect of plant phenology, climactic elements and natural enemies in sazonal variation of these pests on cabbage crops cultivated from 2007 to 2009. The critical life stages of B. brassicae, L. erysimi e M. persicae were the fifth, first and third ninfal instar, respetivaly. Predation by Syrphidae (Diptera) larva and Coccinellidae (Coleoptera) adult were the mortality key factors of B. brassicae e M. persicae, respetivaly. While the mortality key factor of L. erysimi was the fisiological disturbs of insect. The highest densities of three aphid's species were in winter. Brevicoryne brassicae preferentially attacked the stage of cabbage-heads development. While L. erysimi occurred more in the stage of development and maturation cabbage-heads and M. persicae occurred more in in the stages of early formation and development cabbage-heads. Aphids's populations were negatively affected by rainfall, high air temperatures and air relative humidity. Densities of winged were higher in the early crop and in the stage of aturation cabbage-heads. The production of winged morphs of B. brassicae e L. erysimi was proportional to densities of aphids of species and was also affected positively by parasitism and by the density of predator Aphidoletes sp. (Diptera: Cecidomyiidae). Aphids's mortality by Entomophthorales fungi was positivaly affected by inoculo and rainfall, and negativaly by high air temperatures. Parasitism of M. persicae was higher in rain seasons and proprotional to aphid's density. Abundance of Aphidoletes sp. (Diptera: Cecidomyiidae) larvae was also proprotional to aphids's density.