Penelitian dilakukan untuk mengetahui kemampuan antagonisme khamir Filum Ascomycota dari tanaman saeh (Broussonetia papyrifera Vent.) asal Bandung terhadap Aspergillus spp. UICC dari tanaman tomat terinfeksi menggunakan metode co-culture. Seluruh khamir yang diuji (Candida quercitrusa UICC Y-470, Debaryomyces nepalensis UICC Y-456, Pichia burtonii UICC Y-468, Saccharomycetales sp. UICC Y-462, Saccharomycetales sp. UICC Y-471, dan Wickerhamomyces anomalus UICC Y-455) bersifat antagonis terhadap Aspergillus spp. UICC. Saccharomycetales sp. UICC Y-462 merupakan khamir antagonis paling potensial karena memiliki kemampuan menghambat pertumbuhan kapang dan mereduksi lebar hifa kapang A. terreus UICC sebesar 56,90% hingga inkubasi hari ke-3.

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This research investigated the antagonism activity of Phylum Ascomycota yeasts of saeh plant (Broussonetia papyrifera Vent.) from Bandung against Aspergillus spp. UICC from infected tomato plant using co-culture method. All the yeasts (Candida quercitrusa UICC Y-470, Debaryomayces nepalensis UICC Y-456, Pichia burtonii UICC Y-468, Saccharomycetales sp. UICC Y-462, Saccharomycetales sp. UICC Y-471, and Wickerhamomyces anomalus UICC Y-455) are antagonists. Saccharomycetales sp. UICC Y-468 is the most potential antagonistic yeast by inhibiting the growth of hyphae and reducing hyphal length of Aspergillus terreus UICC up to 56.90% at day-3.