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a p p l i c a t i o n s , as w e l l as to ensure a
d i s e a s e - f r e e c r o p , i s t o develop v a r i e t i e s
t h a t combine r e s i s t a n c e t o w i t c h e s - b r o o m
w i t h r e s i s t a n c e t o l e a f h o p p e r s .
VAN VELSON, R . J . 1 9 6 1 .
Witches broom on pigeonpea induced by mealy
bug (Planococcus) i . e . Pseudococcus c i t r i
i n f e s t a t i o n . J . Papua N . Guinea A g r i c .
14 ( 2 - 3 ) : 129. 1115
VASUDEVA, R.S. 1949.
S o i l - b o r n e p l a n t diseases and t h e i r c o n t r o l ,
C u r r . S c i . 1 8 ( 4 ) : 1 1 4 - 1 1 5 . 1116
The spread and c o n t r o l of Fuaarium udum and
Baoillua s u b t i l i s a r e d i s c u s s e d .
VASUDEVA, R.S. 1955.
The e f f e c t o f a s s o c i a t e d s o i l m i c r o f l o r a
of Fusarium udum B u t l . on t h e c a u s i n g of
w i l t of pigeonpea (Cajanus indicus). P r o c .
S i x t h I n t e r n . Cong. M i c r o b i o . 5 :
239-242. 1117
VASUDEVA, R.S. 1958.
Report of t h e D i v i s i o n of Mycology and
P l a n t P a t h o l o g y . Rep. A g r i c . Res. I n s t .
New D e l h i , 1 9 5 5 - 5 6 : 8 5 - 1 0 4 . 1118
A b r i e f r e p o r t o f v a r i e t a l r e s i s t a n c e t o
Fu8arium udum w i l t and f i e l d t r i a l s w i t h
Bacillus s u b t i l i s a n t i b i o t i c i s g i v e n .
VASUDEVA, R.S. 1958.
Report o f t h e D i v i s i o n o f Mycology and
P l a n t P a t h o l o g y . Rep. A g r i c . Res. I n s t .
New D e l h i , 1 9 5 6 - 5 7 : 8 6 - 1 0 0 . 1119
The c u l t i v a r S-55 developed 3.3% i n f e c t i o n
w i t h Fusarium udum w i l t i n p l o t b u t rema
i n e d w i l t - f r e e i n t h e f i e l d .
VASUDEVA, R . S . , and C.V. GOVINDASWAMY.
1953.
S t u d i e s o n t h e e f f e c t o f a s s o c i a t e d s o i l
m i c r o f l o r a on Fuaarium udum B u t l . The
fungus c a u s i n g t h e w i l t of pigeonpea (Cajanus
c a j a n ( L . ) M i l l s p . ) w i t h s p e c i a l r e f e -
rence t o i t s p a t h o g e n i c i t y . Ann. A p p l .
B i o l . 4 0 ( 3 ) : 5 7 3 - 5 8 3 . 1120
The f i l t r a t e s of Aspergillus niger and
mixed f i l t r a t e s o f a l l t h e saprophytes
i n h i b i t e d t h e growth of F. udum on s o l i d
medium. The c u l t u r e f i l t r a t e s a f t e r
passage t h r o u g h s o i l beds f a i l e d t o a f f e c t
a d v e r s e l y t h e growth of F. udum because of
change in pH. Aspergillus terreus appears
to enhance t h e v i r u l e n c e of F. udum.
VASUDEVA, R . S . , A . C . J A I N , and K.G. NEMA.
1952.
I n v e s t i g a t i o n o f t h e i n h i b i t o r y a c t i o n o f
Baoillua aubtilia on Fuaarium udum B u t l .
t h e fungus c a u s i n g w i l t o f pigeonpea
(Cajanus c a j a n ( L . ) M i l l s p . ) . Ann. A p p l .
B i o l . 3 9 : 2 2 9 - 2 3 8 . 1121
E f f e c t s o f t e m p e r a t u r e , p e r i o d o f i n c u b a ­
t i o n , a e r a t i o n , e t c . , o n the p r o d u c t i o n o f
t h e i n h i b i t o r y substance a r e d e s c r i b e d .
The a c t i v e p r i n c i p l e i s absorbed b y s o i l
and to a l e s s e r degree by k a o l i n . A s u i t a ­
b l e b a s i c medium f o r t h e growth of Baoillua
aubtilia, p a r t i c u l a r l y i n r e l a t i o n t o t h e
p r o d u c t i o n o f a n a n t i b i o t i c i n h i b i t o r y t o
Fuaarium udum, is d e s c r i b e d .
VASUDEVA, R . S . , and T.G. ROY. 1950.
The e f f e c t o f a s s o c i a t e d s o i l m i c r o f l o r a o n
Fuaarium udum B u t l . the fungus c a u s i n g w i l t
o f pigeonpea (Cajanus c a j a n ( L . ) M i l l s p . ) .
Ann. A p p l . B i o l . 3 8 ( 2 ) : 1 6 9 - 1 7 8 . 1122
I n o c u l a t i o n w i t h Fuaarium udum B u t l .
produced more w i l t o f pigeonpea i n s t e r i ­
l i z e d than i n u n s t e r i l i z e d s o i l a t t h e same
pH. From u n s t e r i l i z e d s o i l s w i t h low
d i s e a s e i n c i d e n c e , n i n e f u n g i , Baoillua
aubtilia and an Actinomyces were i s o l a t e d .
The number of i s o l a t i o n s of a p a r t i c u l a r
organism v a r i e d from month to month d u r i n g
c r o p p i n g season o f pigeonpea a t D e l h i .
I n t e r a c t i o n of Fusarium udum and o t h e r
organisms i s o l a t e d was s t u d i e d , Aspergillus
niger and A. terreus s e c r e t e d i n h i b i t o r y
substances i n p o t a t o d e x t r o s e b r o t h . The
n a t u r e of medium employed and p e r i o d of
growth were i m p o r t a n t f a c t o r s i n t h e
p r o d u c t i o n o f t h e i n h i b i t o r y p r i n c i p l e ,
w h i c h I s t h e r m o s t a b l e . The low i n c i d e n c e
o f pigeonpea w i l t i n u n s t e r i l i z e d s o i l may
r e s u l t from t h e i n h i b i t o r y a c t i v i t y o f t h e
a s s o c i a t e d m i c r o f l o r a i n t h e s o i l .
VASUDEVA, R . S . , G.P. SINGH, and M.R.S.
IYENGAR. 1962.
B i o l o g i c a l a c t i v i t y o f b u l b i f o r m i n i n s o i l .
Ann. A p p l . B i o l . 5 0 ( 1 ) : 1 1 3 - 1 1 7 . 1123
Bacillus s u b t i l i s i s capable o f p r o d u c i n g
the a n t i b i o t i c b u l b i f o r m i n i n s o i l . Under
u n f a v o r a b l e c o n d i t i o n s f o r a n t i b i o t i c
p r o d u c t i o n , such as t h e presence of r o o t
r e s i d u e s , i n o c u l a t i o n o f B . s u b t i l i s i n t o
s o i l r e s u l t s i n a marked l o w e r i n g o f t h e
i n c i d e n c e of pigeonpea w i l t due to F. udum.
VASUDEVA, R . S . , P. SINGH, P.K. SEN GUPTA, and
M. MAHMOOD. 1963.
F u r t h e r s t u d i e s o n t h e b i o l o g i c a l a c t i v i t y
o f b u l b i f o r m i n . Ann. A p p l . B i o l .
5 1 ( 3 ) : 4 1 5 - 4 2 3 . 1124
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