▁soil ▁or ▁plant ▁t issue ▁where ▁they ▁h atch ▁and ▁the ▁ju ven iles ▁develop ▁into ▁adult s ▁by ▁m oul ting . ▁Typ ically , ▁it ▁inf ect s ▁the ▁young ▁tub ers ▁through ▁the ▁t issues ▁of ▁the ▁t uber ▁growing ▁point , ▁alongside ▁emer ging ▁roots ▁and ▁sho ots , ▁through ▁roots ▁and ▁also ▁through ▁cra cks ▁or ▁dam aged ▁areas ▁in ▁the ▁t uber ▁skin . ▁The ▁n emat ode ▁feed ▁int rac ell ular ly ▁in ▁the ▁t uber ▁t issue , ▁causing ▁ru pt ure ▁of ▁cell ▁wall , ▁loss ▁of ▁cell ▁contents ▁and ▁the ▁formation ▁of ▁cav ities . ▁The ▁cycle ▁last s ▁ 2 1 ▁days ▁and ▁under ▁favor able ▁conditions ▁can ▁greatly ▁increase ▁its ▁population . ▁The ▁S . ▁br ad ys ▁populations ▁are ▁affected ▁by ▁storage ▁conditions ▁and ▁increase ▁at ▁twice ▁the ▁rate ▁in ▁tub ers ▁stored ▁at ▁ 2 2 – 3 2   ° C ▁and ▁relative ▁hum id ity ▁ 4 0 – 8 5 ▁%, ▁when ▁compared ▁to ▁tub ers ▁stored ▁at ▁ 1 6 – 1 8   ° C . ▁The ▁principal ▁mean ▁of ▁dis sem ination ▁of ▁S . ▁br ad ys ▁is ▁through ▁y ams ▁that ▁are ▁propag ated ▁from ▁whole ▁tub ers . ▁ ▁Host ▁range ▁ ▁Although ▁y am ▁is ▁considered ▁to ▁be ▁the ▁main ▁host ▁to ▁S . ▁br ad ys , ▁cow pe a ▁( V ign a ▁un gu icul ata ), ▁ses ame ▁( S es am um ▁indic