FUNGI AND INSECTS ASSOCIATED WITH Acacia decurrens AS INVASIVE SPECIES AT MERAPI VOLCANO NATIONAL PARK IN YOGYAKARTA, INDONESIA Sri Rahayu Faculty of Forestry Universitas Gadjah Mada, Yogyakarta, Indonesia E-mail: [email protected] Introduction Acacia decurrens is to be one of invasive species in the Merapi Volcano National Park (MVNP), Yogyakarta, Indonesia. The seeds and leaves of Acacia less attractive wildlife Merapi, so feared could reduce diversity of wildlife in it. The Acacia plant is also intolerant, so its fast growing and inhibit the growth of native species of Merapi. Simple measurements were taken by MVNP management in some areas, such as in Glagaharjo, Resort a Cangkringan, Sleman, on March 2012, found thata density of A decurrens atc b the seedling and sapling stage were 16.166,7 and 11.813,3 per hectare, b respectively. DBH of Acacia can reach till 26 cm in 18 months. (MVNP, 2012). c The aim of the research are 1. to observed associated fungi and insects on A. decurens, 2. to investigate fungi or insects that may have big potential for reducing growth and development or killing A. decurens as invasive spesies. c Survey research with 10% sampling intensity have been conducted in d MVNP area during 2013. Result and Discussion a. Mt. Merapi, b. Demonstration Plot for restoration Mt. Merapi after eruption, c. Acacia decurrens dominated the demonstration plot, d. Regular survey and research by student from Fac. of Forestry Lawana candida scarab-beetles, beetles Variety of bag worm Branch and Stem wound with b c a heart rot inside the stem Ganoderma Tussock moth, lymantridae and orgyia c b c a a. Micro and b. macro conidia Fusarium Sp. (1000 x) and b c. conidia Diplodia Sp. (450 x) associated with stem wound a The most pathogenic fungus isolate associated with stem wound disease which may potential for killing A. decurrens have to investigate in the future a. Gall rust symptom on the leaf, b. teliospora of rust fungus, Uromycladium tepperianum.