PNABD246.pdf

The blackgram (Vigna mungo) crop in Uttar Pradesh has been found to suffer
from a new fast spreading web-blight disease caused by an aerial strain of
Thanatephorus cucumeris. The pathogen has a wide host range but is specific to
aerial parts. The pathogen produces sclerotia in plenty on the affected parts
and fallen leaves. Basidiospores are formed in nature on healthy tissues
adjacent to lesions. Fruiting of the pathogen in vitro was successfully induced
by making well nourished fungus grown on a less nutritive substratum. The modes
of primary infection and secondary spread and possible methods of controlling
the disease are discussed. [AS]
*0459 Dwivedi, R.P. ; Saksena, H.K. 1974. Occurrence of web blight caused
by Thanatephorus cucumeris on mung bean. INDIAN JOURNAL OF FARM SCIENCE,
v.2:100. [En] (REP.MB-1832)
During field surveys in 1973-74, mungbean was observed to be affected with
web blight caused by Thanatephorus cucumeris (Rhizoctonia solani). In addition
to previously reported hosts, the pathogen was found to cause leaf spots on
Chenopodium album, Brassica oleracea, Sorghum vulgare, Zea mays, Saccharum
officinarum, Triticum aestivum, Hordeum vulgare, Cicer arietinum, and Pisum
sativum. [EMS]
*0460 Wang, T.C. ; Yang, C.Y. 1975. Mungbean leaf blight: a new disease of
mungbean in Taiwan. PLANT PROTECTION BULLETIN (R.O.C.), v.17(4):8-9. [Ch]
(REP.MB-0740)
MEETING: Annual Meeting of the Plant Protection Society of China --
Taichung, Taiwan, ROC, Dec 6-7, 1975
A new disease of mungbean found at AVRDC was identified as Thanatephorus
cucumeris (Frank) Donk. The initial symptoms of necrosis and watersoaking
expand very rapidly to all the trifoliate leaves of the whole plant. The
lesions are green-brown to dark-brown. In a heavily infected mungbean field,
the diseased leaves resemble frost damage and entire leaves can be defoliated
over night. In the morning or under humid weather, a white, downy fungal growth
and cobweb-like mycelia of Rhizoctonia can be observed on the necrotic area. A
few days later, microsclerotia are produced abundantly. Occasionally, large
brown sclerotia may also be observed. The same pathogen infects rice. One
thousand mungbean accessions were screened at AVRDC and a few resistant lines
were selected. [AS/EMS]
*0461 Barman, B. ; Hyder, A. ; Roy, A.K. 1976. Leaf blight of green gram
caused by Curvularia eragrostidis. CURRENT SCIENCE, v.45(12):468. [En]
(REP.MB-1138)
A leaf blight of mungbean causing small, irregular brown spots at the
apices about 1-4 mm long, which later become necrotic and covered with a
copious growth of fructifications, was identified as Curvularia eragrostidis.
The pathogen attacked all 11 cultivars grown in a varietal trial, but with
different intensities. The fungus has previously been reported only on members
of Arachis. [THH]
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