Pathogenicity of Ditylenchus dipsaci to Sainfoin (Onobrychis viciaefolia Scop.).

Since sa infoin may be in t roduced into areas infested with the alfalfa s tem nema tode , we ini t ia ted a s tudy to de te rmine if Ditylenchus dipsaci (K~ihn) Fi l ipjev is pa thogen ic to sa infoin , and what effect t empe ra tu r e has on n e m a t o d e pa thogen ic i ty and rep roduc t ion . G e r m i n a t i n g seeds of sa infoin ( O n o b r y c h i s viciaeJolia Scop. 'Esk i ' and 'Vica ' ) and al fa l fa (Medicago sativa L. 'Ranger ' ) , used as a c o m p a r i s o n , were inocula ted with 25 D. dipsaci per seed. Seedl ings, 100 of each cul t ivar , were g rown in 320 × 215 × 100 m m metal con ta iners of P rovo sand in a g rowth c h a m b e r at 25 C, and the percentages of suscept ible p lants were de te rmined af ter 14 days. Ranger was the most gal led. There were 91, 43, and 43% gal led 'Range r , ' 'Eski , ' and 'Vica ' plants , respect ively. To c o m p a r e the effect of t e m p e r a t u r e on pa thogen ic i ty and r ep roduc t i on of D. dipsaci on Eski sa infoin and Ranger alfalfa, ge rmina t ing seeds were inocula ted with 25 D. dipsaci per seed. Seedl ings, 100 of each cul t ivar , were grown in 320 × 215 × 100 m m