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Pathology
From stems i n o c u l a t e d w i t h Helminthosporium
(Cochliobolus) carbonum, f o u r a n t i f u n g a l
i s o f l a v o n e s ( 7 - h y d r o x y - 4 - m e t h o x y - , 5 , 7 ,
4 ' - t r i h y d r o x y - ; 5 , 7 , 2 ' , 4 ' - t e t r a h y d r o x y ;
5 , 2 ' , 4 ' , - t r i h y d r o x y - 7 - m e t h o x y ) and one
i s o f l a v o n o n e ( 5 , 2 ' - d i h y d r o x y - 7 , 4 ' -
d i m e t h o x y - ) were i s o l a t e d . The s t r u c t u r e
o f t h e l a s t ( c a j a n o l ) was c o n f i r m e d b y
s y n t h e s i s from f e r r e i r i n . A s i x t h compound
was p r o v i s i o n a l l y i d e n t i f i e d a s 5 , 2 ' -
d i d y d r o x y - 7 , 4 ' - d i m e t h o x y i s o f l a v o n e .
ISLAM, N. 1970.
E f f e c t s o f v a r i o u s carbon and n i t r o g e n
sources on growth and s p o r u l a t i o n of
F. udum. 39 p p . M.Sc. (1970) T h e s i s .
Bidhan Chandra K r i s h i V i s w a v i d y a l a y a ,
K a l y a n i , West B e n g a l , I n d i a . 932
J A I N , A . C . 1949.
E f f e c t o f c e r t a i n m i c r o - o r g a n i s m s o n t h e
a c t i v i t y of Fuearium udum B u t l e r , t h e
c a u s a l agent of pigeonpea (Cajanus c a j a n
( L i n n . ) M i l l s p . ) w i l t . 5 0 p p . T h e s i s .
I n d i a n A g r i c u l t u r a l Research I n s t i t u t e ,
New D e l h i , I n d i a . 933
JANARTHANAN, R. 1972.
Occurrence of t h e pigeonpea c y s t nematode
i n T a m i l Nadu. I n d i a n J . Nematol.
2 : 2 1 5 . 934
The pigeonpea c y s t nematode was found
p r e s e n t in T a m i l Nadu and i n f e s t e d cowpeas,
w h i c h may a l s o pose a s e r i o u s problem to
the c u l t i v a t i o n o f p u l s e s .
JANARTHANAN, R., G. SATHIABALAN SAMUEL,
K.S. SUBRAMANIAN, G. NAVANEETHAN, and
T.K. KANDASWAMY. 1973.
A r e p o r t o n t h e survey o f s t e r i l i t y mosaic
d i s e a s e i n c i d e n c e o n r e d gram i n T a m i l
Nadu. Madras A g r i c . J . 6 0 ( 1 ) : 4 1 - 4 4 . 935
From a s u r v e y made o v e r 9,142 h e c t a r e s in
d i f f e r e n t p a r t s o f T a m i l Nadu, i t was
observed t h a t t h e r e d gram s t e r i l i t y mosaic
was p r e v a l e n t i n almost a l l p a r t s o f t h e
s t a t e . The p e r c e n t a g e i n c i d e n c e o f t h e
d i s e a s e suggests heavy crop l o s s e s of r e d
gram i n T a m i l Nadu.
n o t a t t r a c t i v e to E. kern. The l e a f
hopper p r e f e r s t h e reduced C/N r a t i o found
i n d i s e a s e d l e a v e s . D e t a i l e d s t u d i e s o n
the n u t r i t i o n p h y s i o l o g y o f t h e l e a f hopper,
i n c l u d i n g enzymatic s t u d i e s , a r e r e q u i r e d
f o r u n d e r s t a n d i n g o f t h e p r o b l e m .
JEHLE, R.A., and J . I . WOOD. 1926.
Diseases o f f i e l d and v e g e t a b l e crops i n
t h e U n i t e d S t a t e s i n 1925. P I . D i s . Reptr
(Supp.) 4 5 : 1 5 2 . 937
Diseases r e p o r t e d from P u e r t o Rico on
pigeonpea were l e a f s p o t s Cercospora instab
i l i s , Phyllosticta s p p . , Vellosiella
c a j a n i , R h i z o c t o n i a ferruginea, damping-off.
JESWANI, M.D., N. PRASAD, and P.D. GEMAWAT.
1977.
M o r p h o l o g i c a l v a r i a b i l i t y i n Fusarium
l a t e r i t u m f . c a j a n i . I n d i a n J . M y c o l . P I .
P a t h . 5 ( 1 ) : 4 . 938
The pathogen i s h i g h l y v a r i a b l e i n c u l t u r a l
c h a r a c t e r s . S i n g l e - s p o r e i s o l a t e s from
s i n g l e s t r a i n s have a l s o been observed t o
v a r y among themselves w i t h r e g a r d to growth
p a t t e r n , s e g m e n t a t i o n , s u b s t r a t e r e a c t i o n ,
and p i g m e n t a t i o n . D i f f e r e n t i s o l a t e s have
t h e c a p a c i t y o f s e c r e t i n g d i f f e r i n g quant
i t i e s o f m e t a b o l i c p r o d u c t s .
JOFFE, A . Z . 1974.
A modern system of Fusarium taxonomy.
Mycopath. 5 3 ( 1 - 4 ) :201-228. 939
A modern system c o m p r i s i n g 13 s e c t i o n s ,
33 s p e c i e s and 14 v a r i e t i e s is p r o p o s e d ,
based on t h e s t u d y over 30 y e a r s , of t h e
morphology and growth c h a r a c t e r i s t i c s of
Fuearium spp. and t h e i r v a r i a b i l i t y under
a wide range of c o n d i t i o n s .
JOHNSON, J. 1939.
S t u d i e s o n t h e n a t u r e o f brown r o o t r o t o f
tobacco and o t h e r p l a n t s . J . A g r i c . Res.
5 8 ( 1 1 ) : 8 4 3 - 8 6 3 . 940
Symptoms of a f f e c t e d h o s t and c h a r a c t e r i s ­
t i c s o f unknown c a u s a l agent o f brown r o o t
r o t d i s e a s e are g i v e n . Pigeonpeas were
a l s o found t o b e s u s c e p t i b l e .
JAYARAJ, S . , and A . R . SESHADRI. 1967.
P r e f e r e n c e of t h e l e a f Empoasca kerri
P r u t h i (Homoptera: J a s s i d a e ) f o r pigeonpea
(Cajanus c a j a n ( L . ) M i l l s p . ) p l a n t s
i n f e c t e d w i t h s t e r i l i t y mosaic v i r u s .
C u r r . S c i . 3 6 ( 1 3 ) : 3 5 3 - 3 5 5 . 936
The h i g h e r c o n t e n t o f c a r b o h y d r a t e i n t h e
h e a l t h y pigeonpea p l a n t s over d i s e a s e d ones
i n l e a v e s o f medium m a t u r i t y i s p r o b a b l y
KAISER, S . A . K . , and P. K.S. GUPTA. 1960.
Cross p r o t e c t i o n a g a i n s t w i l t d i s e a s e
caused by Fusarium oxysporum s p . udum in
p i g e o n p e a . I n d i a n J . M y c o l . Res.
7 : 3 8 - 3 9 . 941
77.50 t o 81.25% c o n t r o l o f pigeonpea w i l t
due to F. oxysporum f. s p . udum can be
achieved b y p r i o r i n o c u l a t i o n o f t h e h o s t
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