(Ml) HOOT OF < Hl( IFKHS 



103 



II. satix'us 



li. sativiis v;ir. li. niger 

 Jiapistriitii hispaiiiciim 



Ik. prrrnne 

 li. riifiosum 

 Hicolia liinaria 

 lioripa amoracia 

 li. palu,ttri.s 

 ]{. .1 i I fi\<! Iris 

 Seiii'hifra lordiiopus 

 S. pinnatitiila 

 Sinapis abi/xsiiiica 

 S.alha {B'.alba) 



S. apula 



S. arx-ensis {Brassica 

 sinapistrum) 



S. chitien.<!i.i 

 S.geniculata 

 S. turgida 



Sist/mbrium AUiaria 

 S. altissimiim 



S. asperum 

 S. austriacum 



S. bursifolium 

 S. crepidifoUum 

 S. cumingianum 

 S. hirsiiliim 

 S. in CIS urn 

 S. irio 

 S. loeselii 

 S. officinale 



S. orientate 

 S. Pallasii 

 S. persicum 

 S. poli/ceratiiim 

 S. sinapistrum 

 S. strictissimum 



S. taraxacifolium 

 S. Thalianum 

 S. vulgare 

 Sophia pinnata 

 Succovia balearica 



Hal. + ; Sit. + ; Clint. + ; 



Ravn. + ; Cun. S7.i</c ; 



N. (■l3)+:Gi.O 

 X. ("2;). '28) 0;S.s:u-li. 

 N. ('24) out of I ; N. 



('2.')) 1 out of 1 ; Katt. 



60</c 

 Jam. 88.9^/c 

 N. ('21) 2 out of 2 

 N. ('21) 1 out of 1 

 Hal. 

 Ravn. 



Ravn. Jam. 18.97c 

 X. ("21) 0:X. ('25) 

 X. ('21) 0;X. ('2.5) 

 X. ('15) 307c 

 Hal. + + +; Ravn.; Cun. 



1007; Gl. 1007o; Mil. 



100% ;X. ('15) 1007,; 



Rain. 61.l7r; Roc. 



817c.; Jam. 95.6 7o 

 N. ('25) 9070; Katt.' 



10070 



Hal.; Ros.; Clint.; Roc. 



10070; Jam. 58.l7o; 



Mass. -|- ; Ravn. ; Cun. 



1007; Ham. +; N. 



('12) + 

 N. ('25) 50%;Roc. 507o 

 X. ('15)0 

 X. ('15) 95% 

 Mass. + ; Gl. 

 Hal. ; Cun. 38.37 ;X. 



('15)0 

 X. ("15)0 

 Appel; Gl. 1. 25 7o; N. 



("14) 57c; Jam. 12.5- 



44.70 

 N. ('15)0 

 Hal. 



Jam. 21.4% 

 G1.257c 

 Cun. 8I.370 

 Roc. 64 7o 

 Gl. 1.31% 

 Hal.; Ravn.; Cun. 40 7c ; 



Erick.; X. ('12) +; X. 



('13) 3%; X. ('24) 



100%; Gi. 55-10070 

 Gi. 11-10070 

 X. ('15)0 

 Gl. 



X. ('15) l7o 

 X. ("15) 70% 

 AppchX. ('15)0; Jam. 



]07o 

 X. ('15)307o 

 X. ('24) 10% 

 Ravn. 



Hal.; Cun. 53.970 

 X. ('15) 100% ;X. ('24) 



10070; Katt. 100% 



So far 318 species in 59 genera of crueifers have 

 been examined for club root, and among these all but 

 89 species and 8 genera were found to be infected. 

 It is to be noted that the percentage of infection re- 

 ported by the various workers for the same species 

 varies considerably. Such differences are largely due 

 to the small number of plants examined. In some 

 species, particularly wild crueifers, the percentages 

 are based on the examination of only two or tliree 

 plants. This is also true of some of the genera and 

 species which have been reported to be uninfected. 

 Doubtless when a larger number of plants have been 

 examined these species also will be found to be sus- 

 ceptible to club root. 



As has been noted elsewhere, club root is limited 

 to the mustard family, and all rejiorts of its occur- 

 rence in species outside of the Cruciferae have been 

 disproven. In 1910 Marchand reported a disease of 

 melon, celery and sorrel in France wliicli he thought 

 was caused by P. Brassicae, but subsequent examina- 

 tion of these plants by Grignon ('10) showed that 

 the swellings on the roots were caused by the nema- 

 tode, Hcterodea radicicola. Griffon and Maublanc 

 ('12) later confirmed (jrignon's observations. 



.Several attempts liave been made to infect Jilants 

 closelv allied to the mustard family with P. Bras.u- 

 cae, but these have been unsuccessful. In 1897 Hal- 

 sted tested the following species in Xew Jersey: 



Abutilon abutilon 

 Agrostevtma Githago 

 Argrmonc mcjricana 

 Chelidonium majus 

 Krodium cicutarium 

 Hibiscus triunum 



Malva roiundifolia 

 Melilotus alba 

 Papaver sp. 

 Reseda odorata 

 Saponoria officinalis 

 Silene nocti/tnra 



Xo indication of club root was found in any of these 

 species. Potts ('35) likewise found that non-crucif- 

 erous plants, including Reseda odorata, Carydalis 

 f/lauca, Fumaria officinalis, Allium schonprusum, 

 i'rtica pillulifera and Spinacia oleracea, are unsus- 

 ce|)tible. 



