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The research objectives are to: (1). Inventory of attacks of upas fungus (Corticium salmonicolor B.Et.Br) on rubber plants aged 4 years and (2). Calculate latex production in 7 year old rubber plants. The study was conducted in Sukomulyo village, West Kutai Regency since 2015 when the rubber plant was 4 years old and continued in 2019 when the rubber plant was more than 7 years old. The method used is to carry out an inventory of each of 500 rubber plants in 2 locations adjacent to calculating the frequency and intensity of attacks attacked by fungus upas (Corticium salmonicolor B.Et.Br) in 2015. In 2019 continued by conducting research into the calculation of latex production at these 2 locations. The results showed that the attack of pathogenic fungus upas (Corticium salmonicolor B.Et.Br) that attacked the rubber plants from the age of 3 years at 2 locations and at the age of 4 years symptoms appeared with marked outbreaks of tree trunks that eventually became dry. The result of inventory and calculation of attack frequency at location 1 is 1.2% with attack intensity 0.9% and at location 2 attack frequency is 2.4% with attack intensity 1.8%. At the age of 7 years rubber plants affected by the umas fungus growth is stunted and can not remove the sap with marked dry peel tree skin. Production of rubber tapping at location 1 is 530 kg / ha / month and at location 2 is 400 kg / ha / month. The yield of rubber produced at location 1 was higher due to the presence of urea and NPK fertilizer every 3 months and location 2 only 4 months. The low frequency and intensity of upas fungus pathogens at location 1 due to the maintenance and control of the disease since the beginning of planting and intensive fertilization and the addition of fertilizer dosage. Keyword: Disease Inventory, Rubber Latex Production