Infestação da cigarrinha-das-raízes (Mahanarva spp.) (Hemiptera: Cercopidae) em cana-de-açúcar e planejamento amostral em diferentes formas da paisagem

• Ano de defesa: 2015
• Autor(a) principal: Revoredo, Thais Tanan de Oliveira [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Ecofisiologia; Relevo; Umidade; Amostragem; Cigarrinha (Inseto); Entomology
• Link de acesso: http://hdl.handle.net/11449/143032; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/14-07-2016/000865532.pdf

The landscape ecophysiology may indicate which abiotic factors may favor insect pest population. This was already evidenced in Europe. The hypothesis is that the landscape can be considered to plan the control of froghopper in the sugarcane industry. The aim of this study was to determine the influence different landscape ecophysiologies on the infestation of Mahanarva spp.in sugarcane. Scouting data collected in november 2011 and 2012 from 110 areas of São Paulo State Northern region and november of 2010 to 2013 from 294 areas of Minas Gerais State Southwestern region were analyzed. The landscape form in which the areas were located was classified as concave (CC) or convex (CX). It was also evaluated the relationship between levels of froghopper infestation and proximity to the river. Data of infestation in each form of landscape were subjected to analysis of variance using mixed models. The values of the coefficient of variation and error were used to calculate the required number of points to sample for the CC and CX forms. The infestation of froghopper was not greater in areas closer to the river when compared to more distant areas. The initial infestation of nymphs is higher in the concave shape (10.58 and 0.43 nymphs m-1) than in the convex shape (5.03 and 0.37 nymph m- 1) for the northern region of São Paulo State and southwestern region of Minas Gerais State, respectively. The sample planning indicates that for areas within concave-shaped landscapes it is necessary 2 points for nymph evaluation (1 m h-1) whereas for convex-shaped forms 3 observations are necessary