Weed pathogenic fungi play an important role in biological control of weeds. Weeds grow a lot among cultivated plants, the role of weed pathogenic fungi to cultivated plants is not yet known. This research aimed to determine the effect of weed pathogenic fungi on bok choy. The research was carried out in Tambaksogra Village, Sumbang District, Banyumas Regency at an altitude of 100 m above sea level. Randomized block design was used with treatments of weed pathogenic fungi (Fusarium sp., Curvularia sp., Chaetomium sp., Fusarium sp. + Curvularia sp., Fusarium sp. + Chaetomium sp., Curvularia sp. + Chaetomium sp., and Fusarium sp. + Curvularia sp. + Chaetomium sp.) repeated four times. The observed variables included symptoms, incubation period, disease intensity, disease incidence, infection rate, AUDPC, number of leaves, plant height, and plant fresh and dry weight. Results showed that Curvularia sp., Chaetomium sp., and Curvularia sp. + Chaetomium sp. did not affect on bok choy, while Fusarium sp., Fusarium sp. + Curvularia sp., Fusarium sp. + Chaetomium sp., and Fusarium sp. x Curvularia sp. + Chaetomium sp. caused disease intensity of 2.7, 2.7, 3.55, and 4.4%, respectively, and affected plant dry weight by 113.35, 82.36, 77, and 74.07 %, respectively, from control. Curvularia sp., Chaetomium sp., and Curvularia sp. + Chaetomium sp. could be used as a bioherbicide in bok choy cultivation.
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