O desenvolvimento de insetos em frutos ameaça o potencial de germinação das sementes, sendo responsáveis por perdas em um número variado de espécies nativas e de valor econômico no Brasil. O jatobá é uma árvore grande, com 30 a 40 metros de altura, e possui tronco reto, com cerca de 2 metros de diâmetro, sendo bastante utilizado por populações tradicionais em função de suas diversas utilidades, a partir do uso da casca, das sementes, dos frutos, da seiva e das folhas, tendo seu mercado incentivado pelos vários produtos originados. Pesquisas realizadas em diferentes biomas brasileiros com espécies de árvores leguminosas destacam a predação de sementes e frutos por coleópteros broqueadores, afetando a qualidade da semente destinada à perpetuação da espécie. Portanto, este trabalho tem como objetivo avaliar os danos causados por Rhinochenus stigma em frutos e sementes de Hymenaea courbaril. Constatou-se que esse inseto foi responsável pelo consumo médio de 46,79% do peso de uma semente e que a porcentagem de germinação das sementes danificadas foi de apenas 3%. A predação de sementes por R. stigma possui um efeito direto sobre a qualidade fisiológica das sementes de H. courbaril e evitar esses danos são, significativamente, importantes para os coletores de frutos e sementes que o utilizam para confecção de artesanato, bem como para o uso em planos de reflorestamento. Palavras-chave: Insecta. Cryptorhynchinae. Jatobá. Abstract The development of insects in fruits threatens the seeds germination potential and is responsible for losses in a varied number of native species and of economic value in Brazil. Jatoba is a large tree, 30 to 40 meters high, and has a straight trunk, about 2 meters in diameter, it is widely used by traditional populations due to its diverse uses from the use of bark, seeds, fruits, sap and leaves, with its market encouraged by the various originated products. Research carried out in different Brazilian biomes with legume tree species highlights the seeds and fruits predation by boring coleoptera, affecting the quality of the seed aimed at the species perpetuation. Therefore, this work aims to evaluate the damage caused by Rhinochenus stigma in fruits and seeds of Hymenaea courbaril. It was found that this insect was responsible for the average consumption of 46.79% of the weight of a seed and that the germination percentage of the damaged seeds was only 3%. The seeds predation by R. stigma has a direct effect on the physiological quality of H. courbaril seeds and avoiding these damages is significantly important for fruit and seed collectors who use it for making crafts, as well as for use in reforestation plans. Keywords: Insecta. Cryptorhynchinae. Jatoba.
Los lepidópteros más importantes para el cultivo de los eucaliptos son los defoliadores y en Brasil, algunas especies se encuentran desde el estado de Amazona hasta Rio Grande del Sur. Thyrinteina arnobia arnobia (Stoll) (Lepidóptera: Geometridae) se cita como el lepidóptero defoliador más importante en Brasil y algunas especies depredadoras de la familia Reduviidae están asociados con diversos cultivos forestales. En este estudio se registra la ocurrencia de Zelus armillatus (Lepeletier & Serville) depredando a T. arnobia en plantaciones de eucaliptus en la ciudad de Sorriso, estado de Mato Grosso, Brasil. Registration of Thyrinteina arnobia arnobia (Stoll) (Lepidoptera: Geometridae) in Eucalyptus sp. (Myrtaceae) in Sorriso, Mato Grosso and its predation by Zelus armillatus (Lepeletier & Serville) (Hemiptera: Reduviidae: Harpactorinae) Abstract. The most important lepidopterans for eucalyptus crop are called defoliators. In Brazil, some species occur from the Amazônia to Rio Grande do Sul State and Thyrinteina arnobia arnobia (Stoll) (Lepidoptera: Geometridae) is cited as the most important lepidopteran defoliator in Brazil and some predatory species of the family Reduviidae are associated with various forest crops. Thus, this study recorded the ocorrence of Zelus armillatus (Lepeletier & Serville) preying T. arnobia in eucaliptus crop in Sorriso city, Mato Grosso state, Brazil.
Site index curves were adjusted for Eucalyptus urograndis stands located in the municipality of Nova Canaã, MT, using the guide curve method. Six mathematical models were tested to estimate the dominant height of the trees according to age and to verify their accuracy for the definition of site indices. The models tested presented similar values with R² values around 0.40 and errors close to 15%, although none presented expressive superiority in relation to the others. The Schumacher model was used for the construction of curves with four classes of site and with amplitude of three meters each. The model was chosen by statistics presented, for the simplicity and adequate estimation of the heights of the trees with only two parameters, presenting the best graphical distribution of the residues
The objective of this study was to determine and evaluate the yield of four (4) diameter classes in function of quality of logs, in logwood processing of Cedrinho (Erisma uncinatumWarm.). 20 logs of four diameter classes between 46 and 85 cm were selected and classified in terms of quality, being 5 logs for each diameter class. Diameter class I resulted in the lowest yield and diameter class III showed the highest yield. Yield increased according to the diameter of the logs in classes I, II and III. Class IV logs with larger diameters had quality defects such as cracks and internal flaws, causing a small yield drop. It could be concluded that there was a correlation between diameter and yield. ResumoRendimento de madeira serrada em função de classes diamétricas e padrões de qualidade da tora. O objetivo deste trabalho foi determinar e avaliar o rendimento em diferentes classes diamétricas em função da qualidade das toras no desdobro do Cedrinho (Erisma uncinatum Warm.). Foram selecionadas e classificadas quanto à qualidade 20 toras em quatro classes diamétricas, entre 46 e 85 cm, sendo cinco toras para cada classe diamétrica. A classe diamétrica I apresentou o menor rendimento e a classe diamétricaIII apresentou o maior. O rendimento aumentou de acordo com o diâmetro das toras na classe I, II e III. As toras da classe IV, com maiores diâmetros, apresentaram baixa qualidade, com defeitos como rachaduras e falhas internas, causando uma pequena queda no rendimento. Pode-se dizer que existe uma correlação entre diâmetro e rendimento. Palavras-chave: Mato Grosso; serraria; madeira nativa; correlação.
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