Biblioteca do Café

URI permanente desta comunidadehttps://thoth.dti.ufv.br/handle/123456789/1

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2018 - 20192

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Autor: search.filters.author.Sabino, Paulo Henrique de SiqueiraAssunto: search.filters.subject.Coffea arabica

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Agora exibindo 1 - 2 de 2
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    Applications of copper-based fungicides and infestations of Leucoptera coffeella (Guérin-Mèneville & Perrottet) in coffee plants
    (Editora UFLA, 2019-01) Sabino, Paulo Henrique de Siqueira; Silva, Gian Otávio Alves da; Silva, Adriano Bortolotti da; Carvalho, Geraldo Andrade
    The present study aimed to evaluate the effects of applying fungicides with different sources of copper and of the number of applications on the occurrence of Leucoptera coffeella (Guérin-Menéville & Perrottet, 1842) (Lepidoptera: Lyonetiidae) and on the wax content on leaves in a coffee plantation. Four applications of fungicides were carried out, and the effects on the number of leaves mined by the insect and on the wax content on the leaf surface were evaluated. The copper- based fungicides increased the number of leaves mined by the leaf-miner and reduced the wax content on the coffee leaf surfaces in both periods studied.
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    Nitrogen fertilizers and occurrence of Leucoptera coffeella (Guérin-Mèneville & Perrottet) in transplanted coffee seedlings
    (Editora UFLA, 2018-07) Sabino, Paulo Henrique de Siqueira; Reis Júnior, Francisco Ailton dos; Carvalho, Geraldo Andrade; Mantovani, José Ricardo
    The coffee leaf-miner (CLM) Leucoptera coffeella (Lepidoptera: Lyonetiidae) is one of the main pests of coffee plants in Brazil. Its occurrence in the crop is directly related to the physiological state and growth characteristics of coffee plants, in turn related to plant nutrition. The present work, therefore, aimed to evaluate the effect of nitrogen sources on the occurrence of CLM in coffee seedlings. The fertilizers used were ammonium sulfate, urea, and organomineral. The number of leaves mined by CLM and the relative contents of chlorophyll and crude protein in the leaves were recorded. Ammonium sulfate and urea favored higher occurrence of leaves mined and organomineral fertilizer provided the lowest incidence of leaves mined by CLM. The three sources of nitrogen increased the chlorophyll content, but only ammonium sulfate caused an increased percentage of crude protein in the leaves of coffee seedlings. For the improvement of management strategies for L. coffeella it is fundamental to understand favorable conditions, nutritional management it is one of the pest control mechanisms, thus making it possible to control the insect and prevent the population of CLM from reaching an economic damage threshold.