Marcos Giongo

PATOGENICIDADE E TRANSMISSÃO DE FUNGOS ASSOCIADOS ÀS SEMENTES DE Tectona grandis L.f.

The production of teak seedlings is mainly carried out by seeds, which is an important vehicle for the transmission of various pathogens. The purpose of this study was to identify and quantify the fungi associated with teak seeds, the pathogenicity of these microrganisms to the seedlings and the seed-seedling transmission. There were used seeds collected in Tocantins and others acquired in the states of Goias (GO) and in Sao Paulo (SP) for the sanity test. The treatments used were seeds disinfested and not disinfested, and seeds with and without mesocarp. The analysis was conducted using the paper filter method (Blotter test). To pathogenicity test in seedlings, were utilized the isolates of Fusarium sp., Botryodiplodia sp., Alternaria sp. and Plenodomus sp. To evaluate the fungal seedling-transmission were used seeds of each location.The following genera of fungi were identified in the seeds: Fusarium, Trichoderma, Botryodiplodia, Aspergillus, Penicillium, Rhizopus, Cladosporium, Alternaria and Plenodomus . A higher occurrence of fungi was observed in the seeds from the states of GO and SP. Fusarium was the fungal genera with the highest incidence in the seeds of the three states. Only the Fusarium and Botryodiplodia genera were pathogenic to teak seedlings. There was low seed-seedling transmission, with only the phytopathogenic genus Fusarium being transmitted.

Análise da Detecção e Ocorrência de Queimadas em Áreas Urbanizadas e Entorno

Este trabalho analisou a relacao entre queimadas que foram combatid a s em algumas cidades do Estado do Tocantins e focos de calor detectados por varios sensores orbitais durante o ano de 2012. Dados de 346 relatorios de ocorrencia de incendios mostraram a concentracao de 1,42 eventos/km² em areas urban izad as. No entorno de ate 9 km ao redor d ess as queimadas foram registrados 950 focos de calor, dos quais 40% eram das plataformas AQUA_M-T e TERRA_M-T. A analise dos incendios e focos de calor registrados no mesmo dia revelou que apenas 7,8% das queimadas foram registradas por algum dos sensores. Houveram outras 89,5% interseccoes entre as queimadas e a area de abrangencia dos focos de calor, porem com diferenca temporal maior que 2 dias. Esses resultados realcam a inaplicabilidade do uso de focos de calor como ferramenta de monitoramento de queimadas em a reas urban izad as e entorno e evidenciam o potencial de erros quando da utilizacao de produtos com grande intervalo temporal para a validacao de focos de calor e areas queimadas.