PNABD246.pdf

plants. The root-knot index was calculated and correlation coefficients were
worked out. The salient results are, (i) the severity of nematode infestation
is more in absence of borer, (ii) the borer plays a greater part in reduction
of grain yield and pod numbers, (iii) the reduction in pod numbers and
corresponding depression in grain yield in the successive classes of root-knot
index are not related to each other. The pests i.e., nematodes and borer have a
greater impact on grain formation than on pod setting, (iv) the threshold of
root-knot index for a significant reduction in grain yield was 1.5 in the
presence of borer and 3.5 in the absence of borer, (v) treatment with aldicarb
@ 0.5 kg active ingredient per hectare increased yield by 3.5 times, and (vi)
the results are a pointer to the likely associations between pests resulting in
disease severity and crop losses. [AS]
*0588 Singh, R.N. 1972. Root knot disease of urd (Phaseolus nungo) and aung
(P. aureus) in India. INDIAN JOURNAL OF MYCOLOGY AND PLANT PATHOLOGY,
v.2(I):87. [En] (REP.MB-1649)
A natural infestation of Meloidogyne javanica and M. incognita on Vigna
radiata and V. mungo under field conditions is reported. [THH]
*0589 Mathur, R.L. ; Handa, D.K. ; Mathur, B.N. 1973. Resistance of
varieties of cowpea, green gram and guar to root knot nematodes (Meloidogyne
javanica and M. incognita). INDIAN JOURNAL OF MYCOLOGY AND PLANT PATHOLOGY,
v.3(2):182-183. [Enj (REP.MB-1497)
Twenty varieties each of mungbean, cowpea and 8 varieties of cluster bean
were evaluated for their reactions to the root-knot nematodes Meloidogyne
javanica and M. incognita under natural infection. None of the cowpea varieties
was immune or tolerant. Mungbean variety T 44 was immune; T 2 showed moderately
tolerant and the others were susceptible and highly susceptible. B-19-I-55 and
KGC 114 of cluster bean were immune. [THH]
*0590 Catibog, C.S. ; Castillo, M.B. 1975. Pathogenicity of Meloidogyne
javanica on mung bean Phaseolus aureus Roxb. PHILIPPINE AGRICULTURIST,
v.59(5/b):189-195. [EnJ [En Abst] (REP.MB-1121)
Most of the mungbean plants grown in sand and inoculated aseptically with
5, 15, 25, and 50 egg masses of Meloidogyne Javanica died one month after
inoculation. Their root systems were galled and necrotic. Inoculations with 5,
20 and 50 nematode larvae neither caused death nor root necrosis; galls formed
only in plants inoculated with 50 larvae. Greenhouse plants grown in soil
inoculated with 10, 25, 50 and 100 egg masses showed increasing gall ratings
with increasing levels. Significant differences in weights of roots, tops and
pod yields were not observed, although a trend towards increasing root weight
and decreasing top and yield weights with increasing inoculum levels were
noted. The large numbers of egg masses observed on inoculated roots and the
high nematode recoveries from the soil indicated the high susceptibility of the
crop to the nematode. Longitudinal sections of infected roots showed giant
cells usually in the vascular region. [AS]
*0591 Hussaini, S.S. ; Seshadri, A.R. 1975. Interrelationships between
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