four biotypes ( pathotypes ) of the citrus nematode , tylenchulus semipenetrans , occurring in california , u.s.a. were differentiated on the basis of differences of infectivity on 'homosassa ' sweet orange , 'troyer ' citrange , 'pomeroy ' and 'rubidoux ' poncirus trifoliata , 'thompson seedless ' grape , and 'manzanillo ' olive .
C0006754
california
C0041703
u.s.a