PNABD246.pdf

that RB-2 was relatively slow-growing and the mean size of sclerotia of RB-2
was also the lowest. All the isolates were pathogenic on all the varieties of
sunflower tested. Host-range studies showed that RB-I, RB-2 and RB-3 were
highly aggressive on brinjal, cotton and blackgram (Vigna mungo) whereas they
were non-aggressive on maize and groundnut; all the isolates were slightly to
highly aggressive on bhindi, bittergourd, sarson and cowpeas. Isolate RB-I grew
the best at 30 C. Plants advanced in age were severely infected. The
November-sown crop was severely affected as compared with the March-sown crop.
Sclerotia within the tissue were inactivated at 50 C for 10 minutes. (AS]
*0523 Grover, R.K. ; Chopra, B.L. 1977. Seed, soil and foliage treatments
with carboxin and oxycarboxin for control of Rhizoctonia species and their
toxicity to other fungi. PESTICIDES, v.ii(9):38-41. [En] [En Abstj
(REP .MB-2470)
Root rot of Vigna mungo caused by Rhizoctonia solani and of Abelmoschus
esculentus caused by R. bataticola were effectively controlled by carboxin when
used as seed treatment. Oxycarboxin seed treatment was effective in controlling
R. bataticola only. Some downward translocation of carboxin was observed 6 days
after foliage spraying. Soil drenching was not effective in controlling the
root rots by either of the fungitoxicants. Among the nineteen species of fungi
including four isolates of R. solani tested against carboxin and oxycarboxin,
it was found that carboxin was inhibitory to Cladosporium fulvum, C. oxysporum
and Colletotrichum capsici, besides Rhizoctonia species at 1-10 microgram/ml.
Carboxin was most inhibitory to C. oxysporum only. Differential tolerance to
carboxin was exhibited by different isolates of R. solani. [AS]
*0524 Ilag, L.L. ; Marfil, V.E. 1977. Diplodia pod rot of inngbean.
PHILIPPINE AGRICULTURIST, v.61(5/6):186-191. [En] [En Abst] (REP.MB-2007)
A hitherto unreported disease of mungbean (Vigna radiata) in the
Philippines is described. The disease is characterized by the rotting of pods.
The initial symptom is a soft rot which progresses rapidly causing the entire
pod to collapse within 5-7 days. The infected pod later darkens and hardens.
The disease is caused by Diplodia natalensis Pole Evans. Among ten mungbean
varieties that were tested for resistance to the disease, three were moderately
resistant, one was moderately susceptible and the rest were susceptible. In
inoculation experiments conducted under controlled conditions, the fungus also
infected cowpea (V. sinensis), garden bean (P. vulgaris) and sitao (V. sinensis
Savi x V. sesquipedalis). [AS]
*0525 Arora, Y.K. ; Bajaj, K.L. 1978. Phenolic changes in ing (Phaseolus
aureus) infected by Rhlzoctonla solani. ACTA PHYTOPATHOLOGICA ACADEMIAE
SCIENTIARUM HUNGARICAE, v.13(3/4):337-341. (En] [En Abst] (REP.MB-2201)
Mungbean (Vigna radiata) hypocotyls infected by Rhizoctonia solani were
analysed for qualitative and quantitative changes in phenols. The healthy
tissues contained larger quantities of total phenols than the incculated ones.
In the inoculated tissues there appeared two new compounds. Tentative
identification of the phenolic compounds has also been reported. [AS]
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