Tsuchi to biseibutsu
Effect of Pratylenchus penetrans on the severity of Verticillium wilt in cabbage
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
... 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 .