The effect of Pratylenchus penetrans on the severity of Vertici 丗um wnt in cabbage was invest[ gated . First , the severity of the disease in cabbages grown in sterilizeCl soils cQntaining dif [ eren しconcentra 豆ons of micrQsclerotia of V longis ρ orum or V dα ん伽 ε with or Without P . penetrα ns inoculation was evalu 且 tcd . The disease in soil containing 100 microscleroda of V longis ρorum /g dry son with P . penetr α ns was sigrlificantiy more severe than 血 at 血 sQ 且 without inoculation of

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... nematode species , whereas there was no sign 田cant difference in disease severity between soUs with and Without P . penetrans in the presence of 1 , 10, 0r 1 microsclerotja of the fungns / g dry so 且 . Sim 且 arly , in sQ 皿harboring 1 〔 期〕microsclerotia of V dahltae / g d可 sQ 江 the severity was sign 血 canUy increased bY inocula 廿on of P . pertetrans in soil. Fuエther. when cabbages were grown in stel丗zed soils cont 団rling 100r lOO microsclerotia of V longigPorum / g dry . 90il inoculated with P . penetrα ns at different concentrationa disease severity in so 且with lOO microsderotia /g dly son inoculated with higher cQn じentrations of P . penetrans was greater than that in so 且 with lower concentrations of the nematode specie & although there were no significant dfferences in the severity a皿 ong so 且s with lO microsclero ぬ ノ g dry son 血 oculated with any concentra 廿on of P . penetrans. An increase in disease severity hl cabbages by inDcuia 廿〔レ n with P . penetrans in V longisporum − infesteCl so 且s was cQn 血 / med in a field experiment Thus, these results indicate that P. penetrans enhances the severity Qf Ver廿cnlium wnt in cabbage .