Allelopathic effects of root exudates of Chinese onion accessions on cucumber yield and Fusarium oxysporum f. sp. cucumerinum

allelopathic potential of 12 Chinese onion accessions. on germination and seedling growth of cucumber plants and on spore germination and mycelium growth of Fusarium oxysporum f. sp. cucumerinum. The onion root exudates stimulated the growth of cucumber seedlings. The allelopathic potential of root exudates varied among the onion accessions and was lowest in L04 accession and highest in L06 accession. Onion root exudates inhibited the spore germination and mycelium growth of pathogen. The interplanting of Chinese onion accession-high allelopathic potential with cucumber, increased the yield per plant of cucumber and decreased the incidence and pathogenic index of cucumber Fusarium wilt.