Title Author(s) Citation Issue Date STUDIES ON THE DOWNY MILDEWS OF CRUCIFEROUS VEGETABLES IN JAPAN I Hiura, Makoto; Kanegae, Hideo 札幌博物学会会報 = Transactions of the Sapporo Natural History Society, 13(3): 125-133 1934-06-20 DOI Doc URL http://hdl.handle.net/2115/64121 Right Type article Additional Information File Information Vol.13No.3_007.pdf Instructions for use Hokkaido University Collection of Scholarly and Academic Papers : HUSCAP T O G A S H I& ODA: S P O R E S I Z EV A R I A B I L I T YI NS U B S E Q U E N TS P O R EP R I N T S 125 s p o r e sa r ea p tt o showsomewhat s m a l l e randrounderi ns i z e and shapewhen they a r e examinedone o rmore days a f t e rt h ef u n g ia r ec o l l e c t e d ,s i n c et h e f u n g imayd i s c h a g et h es p o r e sc o n t i n u o u s l yandf r e e l ya sl o n ga st h ep i l e i do n o t dryo u to rr o t . I n v e s t i g a t o r ss h o u l db e a ri nmind t h e s ef a c t si f th~y t r y か afungus ofthis group. t oi d e n t i B o t a n i c a lL a b o r a t o r y ,M o r i o k aC o l l e g eo f A g r i c u l t u r ea n dF o r e s t r y ,M o r i o k a ,J a p a n . STUDIESONTHEDOWNYMILDEWS OFCRUCIFEROUSVEGETABLESINJAPANI BY MAKOTOHIURAANDHIDEOKANEGAE (樋浦誠・鐙江英夫) Manyk i n d so fc r u c i f e r o u sv e g e t a b l e su s e f u lt ot h ed a i l yl i f eo ft h eJ a p a n e s e a r e widelyc u l t i v a t e dthroughoutt h et e r r i t o r yo fJ a p a n . Most o fthem belong t ot h egenusB r a s s i c ao rRa1 幼a n u s , and a r ecommonly s u b j e c tt ot h ea t t a c k ofa丹 仰 仰 乎o r afungusknownf o r m e r l ya s 丹 仰 仰1 s p o r aparas がc a( P E R S . )F R . , e r o n o 学o r ab r a s s i c a e GM. butl a t e l yo f t e nd e s i g n a t e da sP h a t I t seemst obei n f e r a b l e fromt h er e c e n ti n v e s t i g a t i o no fG孟UMANN(S)t t h efungusp a r a s i t i cont h e s ec r u c i f e r o u sv e g e t a b l e smightc o m p r i s ev a r i o u ss t r a i n s e n ti np a t h o g e n i c i t y . Toa s c e r t a i nt h i sa s s u m p t i o n , somei n o c u l a t i o ne x p e r i d i能 r ments have beenc a r r i e do u t , and t h er e s u l t ss of a ro b t a i n e da r et e n t a t i v e l y p r e s e n t e di nt h i sp a p e r . Materials andMethods A f f e c t e dl e a v e so fv a r i o u sc r u c i f e r o u sv e g e t a b l e sfoundi nt h eneighbourhood o fG i f uA g r i c u l t u r a lC o l l e g e were c o l l e c t e d ,a s ar u l e , towardse v e n i n g ,washed i nrunningw a t e r ,andeachkepti nam o i s ts a t c h e li nt h el a b o r a t o r y . I nt h i sway, anabundance o ff r e s hc o n i d i aweree a s i l ya v a i l a b l e on t h ef o l l o w i n g morning. The s e e d s usedi nt h e s e experiments were a l lg o t t e na ta s e e ds t o r ei nG i f u . Theyweresownand grown i no r d i n a r yp o r c e l a i np o t s . [ T r a n s .S a p p o r oN a t .H i s t .S o c . ,V o l .XIII,P t .3 ,1 9 3 4 1 T R A N S A C T I O N SO FTHES A P P O R ON A T U R A LH I S T O R YS O C I E T Y 126 Spore s u s p e n s i o n wasi n o c u l a t e d bymeanso fana t o m i z e r , andt h ep l a n t s i n o c u l a t e dwere kepti nm o i s tchambersf o r3 0-48h o u r s . E玄 :p e r i m e n t a lR e s u l t s ( a ) Experimentswitht h eDownyMildewo fRaphanuss a t i v u 人L . v a r .r a p h a n i s t r o i ぬ, MAK. Experiment 1 3 ,1 9 2 8 ,thedownymildewofSima-Daikon,ac u l t u r a lform of OnA p r i l1 Raphanuss a t i v u s ,v a r .r a p h a n i ' s t r o z d e sc o l l e c t e da tRokken, was ino~ulated on 3 ひd a y o l d *p l a n t so fv a r i o u sc u l t u r a lforms o fB r a s s u : aandR a p h a n u s . The 詑 a c t i o n soft h ep l a n t st ot h efungus a r eb r i e f l yt a b u l a t e di n Table 1 . a r i o u sc u l t u r a l formso fRaphanus and Table 1. Reaction ofv B r a s s i c at ot h edownymildewo fSima-Daikon. P l a n t si n o c u l a t e d C u l t u r a lf o r m s S p e c i e s F o r m a t i o no f c o n i d i a Raphan 附 s a t i v 剖 , L . v a r .raphanz ・ s t r o i d e s ,M K . S i m a D a i k o n +++ R a p h a n 1 1 ss a t i v 1 1 s ,L . W h i t eI c i c l e +++ Bmssicap e k i ・町即l s ,R U P R . A b u r a n a T i r i m e n ・ S i r o n a ++ + B γ α's s i c ac / z l 叫 柑i s ,L . S i n a S i r o k u k i T a i n a 。 + b a T a k a n a + S y a g o i n ・K a b u Koma t u n a + B 1 ・ a s s i c ao / e 1 官c e a ,L . v a r .c 匂 , 匁・t a t a ,L . S u c c e s s i o n 一 B, 官s s i c ao / e r a c e a ,L . v a r .b o t . ワ' t i s ,L . L a t eG i a n t 一 B r a s s i c ao . ! 町 出e a ,L・ v a r .getnm伊,官, E x h i b i t i o n 一 D r u m h e a dS a v o y 一 Br σ ,・ s s i c aj z m c e a ,C o s s . B γ αs s i c aRapa,L・ Z E N K E R . B 1 a s s i c ao l e r a c e a ,L . v a r .bul/ata,D C . “+” m e a n sp o s i t i v ei nc o n i d i a lf o r m a t i o n ,w h i l e “一” n e g 乱t i v e . *T h i sm e a n s30d a y sa f t e rs o w i n g . ++ HI 山 A& K A N E G A E : ONTHEDOWNYM I L D E W SO FC R U C I F E R O U SV E G E T A ! l L E SIN" J A P A N I27 Experiment 2 OnOctober 2 3 ,1 9 3 3 , the downy mildew of Miyasige-Daikon, a c u l t u r a l 幼a nuss a t i v u s ,v a r .r a p h a n i s t r o i d e sc o l l e c t e da t Naka,was i n o c u l a t e d form ofRa1 on t e n d a y o l ds e e d l i n g s of the same host and of T a i n a , ac u l t u r a l form of Brass たac h i n e n s i s . Conidiawereabundantlyproduced on theformer, butnone on the l a t t e r . Experiment 3 On November 1 8 ,1 9 3 3 , the downymildew ofMiyasige-Daikon c o l l e c t e d a t Sinkano, was i n o c u l a t e d on 30-day-old p l a n t s oft h e same host and T a i n a . The r e s u l t s were exactlyt h e same a si n Experiment 2 . Experiment 4 On December4 ,1 9 3 3 , thedowny mildew ofMiyasige-Daikonc o l l e c t e da t n o c u l a t e d on v a r i o u sc u l t u r a l forms of R a p l i a n u sand B r a s s i c a . S i n k a n δ,was i The p l a n t si n o c u l a t e d were 25dayso l d . Ther e a c t i o n sa r e shown i n Table 2 . Table 2 . Reactionofv a r i o u sc u l t u r a l forms ofRaphanusand Bras s i c a to the downymildew ofMiyasige-Daikon. P l a n t si n o c u l a t e d S p e c i e s C u l t u r a lf o r m s F o r m a t i o no f c o n i d i a M i y a s i g e D a i k o n S i r i m a r u D a i k o n M i n o w a s e D a i k o n S i r o k u b i H o r y o D a i k o n +++ 揖u sα s' f i v w , L・ Rapha H a t u k a D a i k o n ++ B γ出 s i c aR a , 金、 Komat u n a T e n n o j i K a b u R a p h a n t t ss a t i 四 :u ,L. v a r .raphanistroides,MK. L・ +++ +++ +++ s s i c a歩e k i : 世 間i s ,R U P R . B γa T i r i m e n S i r o n a S i r o k u k i S a n t δ n a ++ B r a s s i c αc h i 抑 制i s ,L . H 1 r o ; , i m a n a Y u k i沿i r o T a i n a 一 i c αo ! e α γc e a ,L. B γ出 s v a r .c a p i t a t a , L. 1、 a m : r n a 一 , 1 2 8 TRANSACTIONS OF THE SAPPORO NATURAi, HISTORY SOCIETY As s e e nfromt h er e s u l t st a b u l a t e da b o v e ,t h e downymildew o fRaphanus s a t i v u s ,v a r .r a p んa n i s t r o i d e s ,s of a ra st h ep r e s e n ti n v e s t i g a t i o ni sc o n c e r n e d ,i s very p a t h o g e n i ct oa l lc u l t u r a lf o r m so fRaphanusa sw e l la st oc e r t a i nc u l t u r a l r a s s i c ap e k i n e n s i s ,andB . Rapa; noto rs l i g h t l yp a t h o g e n i ct omost f o r m so fB r a s s i c ap e k i n e n s i s ,B .c l t i n e n s i s ,B .Rapa,andB . j ' u n c e a , o ft h ec u l t u r a lf o r m so fB andn o tp a t h o g e n i ct ot h ev a r i e t i e s ofB r a s s i c ao ! e r a c e a . ( b ) Experimentsw i t ht h eDownyMildewo fB r a s s i c ape 忌i n e n s ゐL . Experiment 5 On May5 ,1 9 2 8 ,t h edownymildewo fAburana,ac u l t u r a lformo fB r a s s i c a p e k i n e n s i sc o l l e c t e da tInuyama,wasi n o c u l a t e donI O d a y o l ds e e d l i n g s ofSimaDaikonand Aburana. C o n i d i awere produced on both k i n d so fp l a n t s . B u t , t h e amount o ft h ec o n i d i a wasf o u n dt o be l e s s on t h ef o r m e rt h a n on t h e l a t t e r . Experiment 6 6 ,1 9 3 3 ,t h edownymildew o fS i r o n a ,ac u l t u r a lform of On November 1 B r a s s i c ap e k i n e n s i sc o l l e c t e di nt h ee x p e r i m e n t a l farmo fourc o l l e g e , was i n o c u l d . l a t e d ont h es e e d l i n g so fM i y a s i g e -Daikon andT a i n a , bothb e i n g I1 dayo Noc o n i d i a were produced on M i y a s i g e D a i k o n , but they were produced on T a i n a . Experiments 7 8 On December I, 1 9 3 3 ,t h e downy mildew o fS a n t a n a , ac u l t u r a l form o f B r a s s i c ap e k i n e n s i sc o l l e c t e di nt h ee x p e r i m e n t a lfarm o fourc o l l e g e ,wasi n o c u l a t e d on v a r i o u sc u l t u r a lf o r m so fR a p ! t a n u sandB r a s s i c a . The p l a n t s were 22 days o l d , wheni n o c 1 血t e d(Exp. 7 ) . On t h e nextd a y ,t h e downy mildew o fS i r o n ac o l l e c t e di nt h ee x p e r i m e n t a l farm o fourc o l l e g e , wasa l s oi n o c u l a t e d ona n o t h e rs e r i e so ft h e same . Thep l a n t s were 2 3dayso l di nt h i s c u l t u r a lf o r m sa s usedi n Experiment 7 nbothe x p e r i m e n t s c a s e (Exp. 8 ) . Ther e a c t i o n so ft h ep l a n t st ot h e仏 ngusi a r eshownt o g e t h e ri n Table 3・ 一 一 一 一 一 一 一 一 一 一 一 一 一 一 一 ← ー 可 H I U R A& K A N E G A E : ONTHEU川 NY1 ¥ 1 U . D E W 3O FC R U C I F E R O U SV E C E I ' A B L E SIN J A P A N 1 2 9 Table 3 . Reactionofv a r i o u sc u l t u r a lformso fRap!tmmsa r i dB r a s s i ' c a t ot h edownymildewso fSantδnaando fS i r o n a P l a n t si n o c u l a t e d S p e c : e s F o r m a t i o no fc o n i d i a C u ! t u r a lf o r m s E x p .7 E x p .8 l ¥ 1 i y a s i g eD a i k o n S i r i m a r u D a i k o n M i n o w a s e・D a i k o n S i r o k u b i H o r y o D a i k o r . 一 一 一 Rap/zam1ss a t i : 四 ・ s ,L . H a t u k a J J a i k o n ー 一 一 一 一 一 B,官・ s s i c aRapa,L. K o m a t u n a T e n n o j i K a b u +++ +++ +++ +++ +++ +-I+ +++ + H i r o s i m a n a Y u k i s i r o T a i n a +++ + +++ + T a m a n a 一 一 蜘 R a _ . 企1 岨n t 1 ss a t i v . 包 括 , L . v a r .1・aphanis11・uides, M K . B 1 ・ a s s i c ap e k i n e 加 ,古, R U P R . g,官s s i c ac h i n n z s i s ,L. B γ田 辻 但 o / e r a c e a .L. v a r .capitata,L. T i r i m e n S i r o n a S i r o k u b i S a n t o n a Ther e s u l t s of Experiments 5 8i n d i c a t ec l e a r l yt h a tt h edowny mildew ofB r a s s i c ap e k i n e n s i ' s , witht h ee x c e p t i o nofAburana,c a n n o ta t t a c kt h ec u l t u r a l formsof Raphanust e s t e d , showingt h a tt h efungus on B r a s s z c ap e k z n e 加ゐ i s q u i t ed i f f e r e n ti np a t h o g e n i c i t yfromt h a tonR a p l z a 仰 s . Ther e s u l t sa r ea l s o somewhats u g g e s t i v et oi n d i c a t et h a tt h efung u sonAburana,S i r o n a ,andS a n t δ n a , r e s p e c t i v e l y ,mightbed i f f e r e n tp a t h o g e n i c a l l y . However,f u r t h e rstudyi sn e c e s saηrf o ra d e t e r m i n a t i o noft h i sp o i n t . r a s s i c ac h i n e n s 仏L . ( c ) Experimentswitht h eDownyMildewo fB Experiment 9 OnNovember 1 6 ,1 9 3 3 , thedownymildewofT a i n a , ac u l t u r a lform of B r a s s i c ac h i n e n s z ' s ,L .c o l l e c t e d 'fromt h ee x p e r i m e n t a lfarmofourc o l l e g e , was i n o c u l a t e don, t h es e e d l i n g sofM i y a s i g e -DaikonandT a i n a ,whenbothwere II dayso l d . Abundantc o n i d i awereproducedonT a i n a , butnoneon M i y a s i g e Daikon. Experiment IO On December 6 ,1 9 3 3 , thedownymildew of Taina c o l l e c t e d from t h e e x p e r i n : e n t a lgardenoft h eP h y t o p a t h o l o g i c a lD i v i s i o n ,wasi n o c u l a t e donv a r i o u s TRANSACTIONS OF THE SAPPORO NATURAL HISTORY SOCIETY 130 c u l t u r a lformso fRaphanusandB r a s s i c a , whent h ep l a n t swere 27daysofa g e . Ther e a c t i o n sa r e showni nTable4・ Table 4 . Reactionofv a r i o u sc u l t u r a lforms o fRaphanusand B r a s s i c at ot h e downymildewofTaina P l a n t si n o c u l a t e d 」 C u l t u r a lf o r m s S p e c i e s Raphanusα stivus v a r .rapham・ s t r o i d e s ,M K . F o r m a t i o no f c o n i d i a M i y a s ; g e D a i k o n S i r i m a r uD a i k o n M i n o w a s e -D a i k o n S i r o k u b i H o r y o D a i k o n . 町 R αrpha:: u ss a t i 明日, 托 < L . 一 H a t u k a ・ D a i k o n B r . α s s i c aRap α 、L・ K o m a t u n a +++ B γ αssicαpeki. η es i s , L・ T 1 n m e n S 1 r o n a S i r o k u b i S a n t o n a +++ +++ Bras s i c αchi 叫 :e n s i s ,R u P R . H i r o s i m a n a Y u k i s i r o T a i n a ++ T a m a n a 一 托 Br α s s i c ao l e r α c e α ,L・ v a r .capitata, L. +++ The r e s u l t so fExperimer 山 9 -10i n d i c a t et h a tt h efungusonTaina( E r a s sd i s t i n g u i s h a b l ei np a t h o g e n i c i t y fromt h a tonRaphanus, but s z c ac l z i n e n s i s )i seemst o be c l o s e l yr e l a t e dt ot h a t on Santana(See Expt. 7 ) . ( d ) Experiments witht h e Downy Mildewo fB r a s s i c aRapa, L . Experiment 1I On November2 2 ,1 9 3 3 ,t h edownymildewofKurona,p o s s i b l yac u l t u r a l form o fE r a s s i c aRapa, L .c o l l e c t e di nS a r a k i M u r a , wasi n o c u l a t e d on ( I )I 7 d a y o l dp l a n t so fS i r o n a , ( 2 )1 3・d a y o l dp l a n t so fTennoji-Kabu, and ( 3 )4 0 d a y o l dp l a n t so fMiyasige-DaikonandT a i n a . Abundantc o n i d awere formed onS i r o n aandTennoji-Kabu, butnoneon Miyasige-Daikonand T a i n a . Experiment I2 On December I, 1 9 3 3 ,t h e downy mildew of Kurona c o l l e c t e di nt h e e x p e r i m e n t a lfarmofourc o l l e g e , was i n o c u l a t e donv a r i o u sc u l t u r a l forms of HIURA& KANEGAE: ONTHE DoWNYMILDEWSOF CRUCJFEROUSVEGETABLES I NJAPAN I3 I Raphanus and B r a s s i c a . The p l a n t s were 22 days o l d , when i n o c u l a t e d . Table 5r e p r e s e n t st h er e a c t i o n so ft h ep l a n t st ot h ef u n g u s . Table 5 . R e a c t i o nofv a r i o u sc u l t u r a lf o r m so fRaphanus and B r a s s i c at ot h e downymildewo fKurona P l a n t si n o c u l a t e d ‘ ー ー ー ・ 一 一 一 一 一 一 守 一 一 一 一 一 一 ー C u l t u r a l forms S p e c i e s Minowase-Daikon R α' f > h 凶 器 官ss a t i v u s , L・ S i r i r n a r u D a i k o n v a r .r a p h a n i s t r o t ・ ' d e s , MK. Miyasige-Daikon Formationo f c o n i d i a 一 一 S i r o k u b i I I o r y o・Daikon ' Rapha 揖t t ss a t i 匂u s ,L . Hatuka-Daikon Brassica R a _ . 企a ,L . Kornatuna +++ Tennoji-Kabu + T i r i r n e n S i r o n a + + B γ αs s i c af e k £叫 帥s i s , RUPR. S i r o k u k i S a n t o n a Brassicac h i n e n s i s , L・ H 1 r o s i r n a n a V u k i s i r oTaina B r . αs s i c ao ! e r . ε αe a ,L v a r .c a p i t a t a ,L . Tarnana Ther e s u l t soft h e s ee x p e r i m e n t sa l s oi n d i c a t et h a tt h ef u n g u s onB r a s s i c a Rapa i se v i d e n t l yd i 紅e r e n tfromt h a tonR a p h a n u s . I ti sn o t i c e a b l et h a tt h edownymildew o fB r a s s i c ap e k i n e n s i s ,B.c h i n e n s i ' . s , and B. Rapa,r e s p e c t i v e l y ,i sc l o s e l yr e l a t e d ,s i n c ei t has as i m i l a rr a n g eo f e n c e si nt h egrade o fp r o d u c s u s c e p t i b l eh o s t s . However,t h e r ea r e somed i佐 r 民r e n c e sa r e t i o no fc o n i d i a , andi tr e m a i n st obe d e t e r m i n e d , whethert h e s ed i s i g n i f i c a n t from t h es t a n d p o i n to fp h y s i o l o g i c a ls p e c i a l i z a t i o n ,o ra r e merely e x p l a i n e d byt h ei n f l u e n c eo fe n v i r o n m e n t a lf a c t o r s . Considerations I n 1926, G A . u M A K r . ; < 3 >r e p o r t e dt h a tP e r o n o s p o r ab t 加 s i c a eGM. i ss u b d i v i d e d i n t ot h r e eb i o l o g i cf o r m s , namely: ( 1 )f .s p .b r a s s i c a e ,t h ep r i n c i p a lh o s t so fwhicha r eB r a s s i c ao l e r a c e a ,L . , B r . Napus, L . ,B r .Rapa, L . ,Br.n i g r a( L . )KocH, Br. ノ•itncea ( L . )C o s s . ,B r . グo r t i i ,GOVANandB r .f r u t i c u l o s a ,CHR. I ti sa b l et oproduces u b i n f e c t i o n s Tounz 1 3 2 T R A N S A C T I O N SO FT H ES A P P O R ON A T U R A LH I S T O R YS o c I E T Y i n a p i sa r v e n s i s ,L . ,S i n .a l b a ,L . ,RaphanusR a p h : : m i s t r u m ,L . ,R. s a . t i v u s , on S L . ,and Erucas a t i v a ,L . 王 s p .s i n a p z d i s ,t h ep r i n c i p a lh o s t so fwhicha陀 S i n a p i sa r v e n s i s ,L . , ( 2) and S .a l b a . I ti sa b l et oproduce s u b i n f e c t i o n sona l lt h eabove-mentioned r a s s i c a ,witht h ee x c e p t i o no fB r . Rapaand B r .j u n c e a ,andboth s p e c i e so fB a p h a n u s , witho c c a s i o n a lc o n i d i o p h o r ef o r m a t i o nonB r .o l e r a c e a . s p e c i e so fR ( 3 )f .s p .r a p h a n i ,t h ep r i n c i p a lh o s t so fwhicha r eRザ h anusR a p h a n i s t r u m , L . and R .s a t i v u s ,L . I ti sa b l et oproduce s u b I n f e c t i o n s on a l lt h e abover a s s i c a( e x c e p tB r .戸 シu t i c u l o s a ) ,a sw e l la sonboths p e c i e s mentioneds p e c i e so fB o fふ ・n a p i s ,w i t ho c c a s i o n a lc o n i d i o p h o r ef o r m a t i o nonB r .o l e r a c e aandB r .λT a p u s . I n1 9 3 3 , SAWADA (心 d e s c r i b e dt h eP e r o n o s p o r aonB r a s s i c ac h i n e n s i ' sunder e r o n o s p o r aB r a s s i c a e , GM., a l s ot h e丹 r o n o s p o r a on R a p ! t a m t s t h en : u n eo fP s丹 r o n o 学o r aB r a s s i c a e ,GM.ιsp. R a p h a n i ,SAw.,withoutmentions a t b u s ,L .a sp u b l i c a t i o ns t a t e da b o v e . i n g G瓦UMANN’ Accordingt o SAWADA, H. KUROSAWAf o r m e r l yprovedbyi n o c u l a t i o nexp e r i m e n t st h a t( 1 )t h ef u n g u s onT a i n a , ac u l t u r a lform of B r a s s i c aC βtll ZSか F L . ,i sc a p a b l eo fi n f e c t i n gS i r o n a g r o u p( B r a s s たd p e k i n e n s i s) ’ Tamana-group ( B r .o l e r a c e a ) ,Kabu-gro叩 ( B r .R a p a ) ,andKarasina-group( B r .f u n c e a ) ,but i s Raphanuss a t i v u s ) ;( 2 ) on theotherhand the u n a b l et oi n f e c t Daikon-group( n f e c t sr e a d i l ymanyc u l t u r a lf o r m so fR aphanus,butveηr f u n g u s onRaphanusi r a r e l ymanyf o r m so fB r a s s i ' c a ,witht h ee x c e p t i o no fB κo ! e r a c e awhichi sr a t h e r r .o l e r a c e ai su n a b l et oi n f e c tR aphanus,although s u s c e p t i b l e ;( 3 )t h ef u n g u sonB r a s s i c a . i ti sc a p a b l eo fi n f e c t i n ga l lt h ec u l t u r a lf o r m so fB I fG孟UMANN’ sr e s u l t si ni n o c u l a t i o ne x p e r i m e n t sw i t ht hき f u n g : J sfromB r a s s i c a o l e r a c e aa r ecomparedw i t ht h o s er e p : : i r t e dbySAWADA,i ti sp e r c e i v e dt h a tt h e r e i s ag e n e r a lc o i n c i d e n c ebetween t h et w o . Thesamei sa l s ot h ec a s ew i t ht h e r e s u l t so ft h ee x p e r i m e n t sont h ef u n g u sfromRaphanuss a t i v u s ,suggestingt h a t a p ! t a n iSAW. i s asynonymo f f .s p .r a p h a n iGM. f .s p .R As h a s been a l r e a d ys t a t e d ,t h er e s u l t soft h ep r e s e n ti n v e s t i g a t i o na r e S U日c i e n tt oshowt h a tt h ef u n g u sonRaph 抑制 s a t i 叩 : si sd i s t i n g u i s h a b l ep a t h o r a s s i c a . However,i tseemsq u i t eq u e s t i o n a b l e , whether g e n i c a l l yfromt h a tonB rB r a s s i c ai su n i f o r mp a t h o g e n i c a l l y . The o rn o tt h ef u n g u s on Raphanuso t u d i e d byt h ep陀 s e n tw r i t e r sh a sa p p e a r e dt o be more f u n g u s onRaphanus s r a s s i c athant h a ts t u d i e dbyG A . u M A N N . Thebehaviour p a t h o g e n i cons p e c i e so fB o ft h ef u n g u s onB r a s s i c aRapahas been a l s ofoundt obesomewhatd i 任e r e n t fromt h a tr e p o r t e dbyt h el a t t e r . S t i l lmore, t h er e s u l t soft h ep r e s e n te x p e r i ments w i t ht h e downymildew 企om v a r i o u sc u l t u r a lformsof B r a s s i c ah ' l v e s u g g e s t e dt h ' l tt h ef u n g u s on B r a s s z ・ m mightnotbe u n i f o r m ,s i n c et h e r e have beenf o : i n d some d i f f e r e n c e si nt h er e a c t i o n so ft h esamep l a n t st oeach s t r a i n HIURAt ,KANEGAE: ONTHEDOWNYMILDEWSOFCRUCIFEROUSVEGETABLES! ' . ' /J APAN J3 3 ofthefungus. I fproperdi佐 rentialhosts are chosen,andinoculationsaremade under controlledconditions, theproblem under consideration may be proved to be more complex than hitherto considered. Biometricalstudieshaveshown that theconidiaofthefungus on Rap βa n u s s a t i v u s are considerably smaller than those on B r a s s i c a . This i s mainly in accordance with the descriptions given by SAWADA. Further study i s now i n progress. L i t e r a t u r ec i t e d ( 1 ) GXUMANN7 E . : Uber d出 Formen d e r Pero 附ザo r ap αr a s i t i c a( P E R S . )F R . Ein B e i t r a gz u r S p e z i e s f r a g eb e i denp a r a s i t i s c h e nP i l z e n . B e i h .B o t .C e n t r a l b .A b t .I ,3 5:I 1 4 3 ,1 9 1 8 . ( 2 ) :B e i t r i i g ez ue i n e rM o n o g r a p h i ed e rG a t t u n gPerono グo r aCりR D A . B e i t r .K r y p t . f l o r ad .S c h w e i z ,B d .5 ,H e f t4 :I 3 6 0 ,1 9 2 3・ ( 3 ) : Uberd i eS p e z i a l i s i e r u n gd e sf a l s c h e nM e h l t a u s(Peron山r p o r ab r a s s i c a eG~I・) a u f demKohl und s e i n e nV e r w a n d t e n . L a n d w i r t s .J a h r b u c hd .S c h w e i z ,40:4634 6 8 ,1 9 2 6 . e s c r i p t i柁 c a t a l o g u eo ft h eFormos:mf u n g iP t .VI:宮3 2 8 ,1 9 3 3( J a p a n e s e ) . ( 4 ) SAWADA,K.: D D i v i s i o no fP l a n tP a t h o l o g y , G i f uC o l l e g eo fA g r i c u l t u r eandF o r e s t r y , G i f u ,J a p a n
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