Fungi at Eucalyptus Urophylla S.t. Blake in Log Yard (Tpk) PT. Toba Pulp Lestrari, Tbk. Kabupaten Toba Samosir North Sumatera

The accumulation of logs in log yard (TPK) in a longtime cousing wood deterioration by wood destroyer organism specialy from fungi. The objectives of this research were to find out the types of fungi at E. urophylla wood in TPK PT. Toba Pulp Lestari, Tbk in Sosor Ladang Village Toba Samosir Regency North Sumatera, and to find out cause of incidence of fungi at E. urophylla wood heap. The research was took wood samples which striken by fungi from TPK with lenght 20-25 cm and diametre 15-30 cm and then isolated fungi from the samples. Identification the isolate we've been 7 – 14 days to find out its types. The observation in two ways, macroscospic observation in colonies diameter, colonies colours, and colonies form; and microscopic observation in mycelium, spore or conidia, conidia's size, conidia's colour, septate, and conidiofor. The research showen that in E. urophylla wood have eight types of fungi, consist of Trichoderma sp.1, Trichoderma sp.2, Trichoderma sp.3, Aspergillus sp., Acremonium sp., Mucor sp., Penicillium sp., and Rhizopus sp. Key words: Eucalyptus urophylla, fungi, TPK Key words: Eucalyptus urophylla, fungi, TP