| Summary: | Fusarium wilt of banana (Musa paradisiaca L.) is caused by Fusaium oxysporum f.sp. cubense (FOC). Disease controls with chemical treatment, field draining, rotation system, and organic material do not show effective result. The research was aimed to (1) study Fusarium wilt development in two types of banana i. e., Ambon Kuning and Kepok Kuning which were intercropped with Allium spp., (2) study intercropping effect on Fusarium spp. total population in soil, (3) study effect of some Allium, spp. extract to inhibit FOC development and sporulation in vitro. Parameters observed were disease incidence, Fusarium spp. total population, fungal colony development, and sporulation. Kucai (Allium tuberosum) which was intercropped with Ambon Kuning, suppressed fusarium wilt disease incidence to 12,5% less compared to control. Meanwhile, intercropping with Kepok Kuning suppressed disease incidence 4,2% less than control.Shallot (Allium cepa agregatum group) which was intercropped with Ambon Kuning and Kepok Kuning suppressed Fusarium spp. total colony up to 62,5% and 0%, respectively. The use of 75% kucai (Allium tuberosum) extract suppressed Fusarium oxysporum f.sp. cubense diameter colony by 57%. The use of 100% shallot (Allium cepa agregatum group) extract suppressed Fusarium oxysporum f.sp. cubense spore germination by 89%.
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