ABSTRACT: Whitefly Bemisia tabaci (Gennadius) biotype B is the major pest of common bean (Phaseolus vulgaris L.) in Brazil and other countries. Host plant resistance is one of the cornerstones of Integrated Pest Management (IPM), and assessment of cultivars for insect resistance is fundamental to provide farmers options for pest control. This study evaluated common bean resistance to whitefly in the winter and rainy seasons in Jaboticabal, Brazil, and correlated the infestation with climatic factors. The plant part and development period of common bean that are more susceptible to whitefly infestation were also examined for potential use in IPM. Field experiments were carried out using 18 and 19 commercial cultivars in the winter and rainy seasons, respectively. Whitefly eggs, nymphs, and adults in the upper part and lower part of plants were sampled from 25 to 60 days after emergence (DAE). Cultivars IAC-Una and IAC-Eldorado had less oviposition and the former also showed lower adult infestation in the winter season. In the rainy season, cultivars IAPAR-81 and Guará had a smaller number of eggs, whereas IAC-Centauro was less infested by nymphs. The number of nymphs and adults was similar among cultivars in the winter and rainy seasons, respectively. The upper part of plants had a greater number of eggs and adults, while, the lower part harbored larger numbers of nymphs. Common bean was more susceptible to whitefly at 25-32 DAE in both seasons. These results add useful information to IPM of whitefly in common bean.

RESUMO A produção de biocombustível a partir de palmeiras nativas da Amazônia, pertencentes à família das Arecaceae, como a Attalea maripa (Aubl) Mart. (inajá), são objetos de estudos de fontes energéticas alternativas para a produção de biocombustíveis. Dessa forma, o objetivo desta pesquisa foi avaliar a dinâmica espacial das variáveis morfoagronômicas de produção da cultura do inajazeiro associado às características dos locais de amostragem, em uma área de crescimento espontâneo, na região do Baixo Tocantins. Foram selecionadas 100 palmeiras de A. maripa, de crescimento espontâneo e em fase de produção, em uma área de 10 ha, no município de Cametá-PA, nas quais foram realizados os levantamentos das variáveis morfoagronômicas (NIM, NIF, NCA, NF, DAP, PMCA e PMF), no período de janeiro de 2014 a junho de 2014. Foram elaborados os semivariogramas para cada variável estudada, que apresentaram um alcance de dependência espacial de 75 metros para NIM, NIF, PMCA e PMF; 80 metros para NF e DAP, e 98 metros para NCA. Já a área de alcance encontrada foi de 17.671,5 m² para as variáveis NIM, NIF, PMCA e PMF; 20.106,2 m² para NF e DAP, e 30.171,9 m² para NCA. Os dados das variáveis se ajustaram-se ao modelo esférico, apresentando coeficiente de determinação (R²) que variou de 0,57 a 0,99. O índice de dependência espacial (IDE) para as variáveis NIM e NIF foi de 0,49 e 0,31, respectivamente, que indica dependência espacial moderada. Para as variáveis NCA, NF, DAP e PMCA, variaram de 0,17 a 0,22, resultando em dependência espacial fraca. Já a variável PMF apresentou IDE com valor 0,77. Para análise visual da distribuição espacial das variáveis estudas, foram elaborados mapas de krigagem.

ABSTRACT The production of biofuels from native Amazonian palm trees, belonging to the family of Arecaceae, like Attalea maripa (Aubl) Mart. (Maripa palm), are objects of studies of alternative energy sources for the biofuels production. Thus, the aim of this research was to evaluate the spatial dynamics of agronomic variables of Maripa palm crop production associated with the characteristics of the sampling sites in a spontaneous growth area in the Low Tocantins region. 100 palms of A. maripa were selected, of spontaneous growth and in production phase, on a 10 ha area in the municipality of Cametá / PA, in which the morpho-agronomical variables were collected (MIN, FIN, ABN, LN, DBH, AWAB and AFW), from January 2014 to June 2014. The semivariograms were produced for each variable, which presented a spatial dependence range of 75 meters to MIN, FIN, AWAB and AFW, 80 meters to LN and DBH and 98 meters to ABN. The area of reach found was 17,671.5 m² for MIN, FIN, AWAB and AFW variables, 20,106.2 m² for LN and DBH and 30,171.9 m² for ABN. The data of the variables were adjusted to the spherical model presenting determination coefficient (R²) that ranged from 0.57 to 0.99. The spatial dependence index (SDI) for MIN and FIN variables was 0.49 and 0.31, respectively, indicating moderate spatial dependence. For ABN, LN, DBH and AWAB variables ranged from 0.17 to 0.22, resulting in poor spatial dependence. The AFW variable presented SDI of 0.77. For the visual analysis of the spatial distribution of the studied variables, kriging maps were created.