b'thentothetuberyield.Chemical maintainorincreasetheinitial ments with reproductive factor (Rf)controlstrategiesarecostlyand nematode population in at least one 2.Susceptiblecheckpotato(Redhaveadeleteriouseffectonsoil of the trials, with the exception of Norland) showed the good hostingorganismsandtheenvironment. Alfalfa(Bullseye)whichshowed ability for the nematode in both tri-Non-host and poor host cover crops, poor hosting ability and consistent- alswhileFababean(Petite)wasas well as crops with bio-fumigation ly reduced the nematode population foundtobeanexcellenthostinproperties, can be an economically in both trials. Annual ryegrass elim- bothtrials,withreproductionrateeffectiveandenvironmentally inatedalmost60%oftheinitial muchhigherthanthepotatosus-sound approach to manage P. pene- nematodepopulationinthesoil ceptiblecheck.Covercropswithtransininfestedpotatofields. whilewinterrye(Dylan)reduced poor hosting ability have the greatGreenhouse experiments were con- 32% of the population in the second potential to be utilized for effectiveducted to screen 25 cover crops that trial.management of the nematode. arebeingusedandwilllikelybeintroduced in our region to evaluate However, both of them maintained Thisresearchwillbehelpfulfortheir ability to host and reduce the the nematode population in the first assistingpotatofarmerstoselectpopulationofP.penetrans. trial.Camelina(Bison),crimson suitablecovercropsformanage-Experimentswereconductedtwice clover (Dixie), Flax (Carter), foxtail ment of P. penetrans in the fields tousingnematodeinfestedsoilina millet(Siberian),wintercamelina reduceyieldlossduetonematodecompletely randomized design with (Joelle),andcontroltreatment infestation.fourreplicationsforeachofcover wheat (Glenn) were the crops con-crop and control treatments. All the stantlymaintainingthenematodecovercropstestedwerefoundto populationthroughouttheexperi-905 Jet Stream Dr.24 POTATO GROWER MARCH 2021'