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Pathology
v a r i a t i o n and taxonomic c o n s i d e r a t i o n s o f
F. udum B u t l . the c a u s a l organism of w i l t
o f pigeonpea. 6 2 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 . 1060
produced from a p p r e s s o r i u m . Out of 139
a r h a r v a r i e t i e s s c r e e n e d , 3 / 2 3 - 3 6 / 1 alone
was found r e s i s t a n t . B i s d i t h a n e was
e f f e c t i v e t o some e x t e n t i n c h e c k i n g t h e
secondary spread of the d i s e a s e .
SABET, K.A. 1959.
S t u d i e s o n t h e b a c t e r i a l diseases o f Sudan
c r o p s . 3. On t h e o c c u r r e n c e , h o s t range and
taxonomy o f t h e b a c t e r i a c a u s i n g l e a f
b l i g h t diseases o f c e r t a i n leguminous
p l a n t s . Ann. A p p l . B i o l . 4 7 : 3 1 8 -
3 3 1 . 1061
The concept of Xanthomonaa phaseoli is
broadened t o i n c l u d e s e v e r a l b a c t e r i a
c a u s i n g l e a f b l i g h t s o f legumes, i n c l u d i n g
the new c o m b i n a t i o n X. phaseoli f. s p .
c a j a n i w h i c h , u n l i k e most o f the o t h e r
s p e c i a l t y p e s , i n f e c t s o n l y o n i t s o r i g i n a l
h o s t i.e. Cajanus c a j a n ( L . ) M i l l s p .
SABET, K . A . , F. ISHAQ, and 0. KHALIL.
1969.
S t u d i e s on t h e b a c t e r i a l diseases of Sudan
c r o p s . 7. New Records. Ann. A p p l . B i o l .
6 3 ( 3 ) : 3 5 7 - 3 6 9 . 1062
Xanthomonaa phaseoli f. s p . oajani was a
new r e c o r d f o r Sudan on pigeonpea. The
nomenclature of Xanthomonas is d i s c u s s e d .
The s t r a i n s on weeds can a l s o i n f e c t
c u l t i v a t e d c r o p s .
SAKSENA, H . K . , and K, KUMAR. 1 9 7 1 .
Some aspects of epidemiology and c o n t r o l
of Phyllostiota l e a f spot of. arhar (Cajanus
c a j a n ( L . ) M i l l s p . ) . P r o c . N a t . Acad. S c i .
I n d i a . ( S e c t . B) 3 7 ( 6 ) : 3 9 9 - 4 0 6 . 1063
Leaf spot o f Cajanus cajan ( L . ) M i l l s p .
caused by Phyllostiota oajani Sydow has
been found t o occur i n i n c r e a s i n g p r o p o r ­
t i o n s t h r o u g h o u t U.P. i n r e c e n t y e a r s .
The disease appears i n J u l y and p e r s i s t s
t h r o u g h o u t t h e crop season. Two y e a r s '
d ata o n d i s e a s e i n c i d e n c e i n f i e l d s have
shown t h a t percentage o f disease i n t e n s i t y
v a r i e s from 4 . 3 t o 3 1 . 8 . The d i s e a s e
i n t e n s i t y was h i g h ( 2 1 . 2 to 31.8%) from
J u l y to O c t o b e r , at mean temperature range
of 20 to 30°C and mean h u m i d i t y range of
73 to 89%. The maximum disease i n t e n s i t y
was observed i n A u g u s t , a f t e r w h i c h i t
g r a d u a l l y d e c l i n e d , t o u c h i n g i t s l o w e s t
d u r i n g t h e c o o l months of December and
J a n u a r y . The pathogen s u r v i v e d i n i n f e c ­
t i v e stage f o r more than 1 5 months i n
diseased p l a n t r e f u s e i n s o i l , w h i c h serves
as a p r i m a r y source of i n o c u l u m . Spores
germinated in 6 to 8 hours and p e n e t r a t i o n
o f l e a f o c c u r r e d t h r o u g h stomata and i n t a c t
s u r f a c e by means of an i n f e c t i o n peg
SAKSENA, H . K . , and R.R. UDIT NARAIN SINGH.
1976.
Mycosphaerella from a l e a f spot of a r h a r
(Cajanus cajan ( L . ) M i l l s p . ) . I n d i a n J .
Fm S c i . 4 : 1 2 4 - 1 2 5 . 1064
On the b a s i s of t h e m o r p h o l o g i c a l c h a r a c ­
t e r s , t h e fungus is i d e n t i f i e d as a species
of Mycosphaerella. This appears to be t h e
f i r s t r e c o r d of Mycosphaerella on a r h a r
from any p a r t o f t h e w o r l d . This species
has been r e p o r t e d as t h e p e r f e c t s t a t e of
species of i m p e r f e c t genera such as
Phyllostiota and Cercospora.
SAMAJPATI, N. 1973.
I n t e r a c t i o n o f n e a r - u l t r a v i o l e t r a d i a t i o n
and h y d r o g e n - i o n c o n c e n t r a t i o n on growth
and s p o r u l a t i o n of Fusarium udum B u t l .
S c i . C u l t . 3 9 ( 3 ) : 1 2 7 - 1 2 9 . 1065
At p r o p e r pH 5 . 0 , NUV i r r a d i a t i o n can
e f f e c t i v e l y induce e i t h e r v e g e t a t i v e growth
or s p o r u l a t i o n . At pH 3.5 to 4 . 5 , and 8.0
t h e r e i s n o s p o r u l a t i o n e i t h e r under dark
or NUV b u t at 4 . 5 and 7.5 t h e r e is a spor
u l a t i o n under NUV. A t r e a t m e n t of NUV
i r r a d i a t i o n and p H o r the i n t e r a c t i o n o f
b o t h on g r o w t h and s p o r u l a t i o n of t h e
t e s t - f u n g u s are s t u d i e d .
SAROJINI, T . S . L946.
S o i l c o n d i t i o n s and r o o t diseases w i t h
s p e c i a l r e f e r e n c e to Fusarium udum on r e d
gram. P h . D . (1946) T h e s i s . U n i v e r s i t y o f
Madras, Madras, Tamil Nadu, I n d i a . 1066
SAROJINI, T . S . 1950.
S o i l c o n d i t i o n s and r o o t diseases m i c r o -
n u t r i e n t elements and d i s e a s e ; development
of Fusarium udum on r e d gram (Cajanus indicus
L i n n . ) . J. Madras U n i v . ( S e c t . B)
1 9 : 1 - 3 2 . 1067
SAROJINI, T . S . 1 9 5 1 .
S o i l c o n d i t i o n s and r o o t d i s e a s e s . P a r t I I .
Fusarium disease on red gram (Cajanus
indicus) . P r o c . I n d i a n Acad. S c i . ( S e c t . B )
3 3 ( 2 ) : 4 9 - 6 8 . 1068
A number of d i s t i n c t l y v a r y i n g s t r a i n s were
i s o l a t e d . P a t h o g e n i c i t y t e s t s w i t h F. udum
and i s o l a t e s i n d i c a t e d t h a t s t r a i n I and
s t r a i n s I I and I I I were more v i r u l e n t t h a n
t h e o t h e r s t r a i n s . Preemergence w i l t was
m a i n l y caused by s t r a i n s V and V I . M i c r o -
133