PNABD246.pdf

of Agriculture, Los Banos, the Philippines. The disease apppears
by
to
Cercospora
be caused
cruenta Sacc., which is responsible for leaf spot diseases of
various species of beans in the United States, India, Ceylon, and China.
disease
The
is very serious and inhibits pod development due to defoliation or
partial destruction of the photosynthetic area of leaves. About 100% of
leaves
the
and 75. of the older pods are attacked. Stems are less frequently
parasitized. Inoculation experiments with pure cultures
lussoniensis
of Cercospora
on Vigna radiata produced symptoms slightly different from those
caused by Cercospora cruenta. Conidiophores and conidia were of approximately
the same length and appeared very similar. A close relationship between these
two species of Cercospora is suggested. While it is believed
mixture
that Bordeaux
will successfully control the disease, it is not recommended because o
the cost involved. Resistant varieties and a change in cultural practice are
suggested as possible means of combatting the disease. [AS]
*0369 Solheim, W.G. ; Stevens, F.L. 1931. Cercospora studies 2. Some
tropical Cercosporae. MYCOLOGIA, v.23:365-405. tEn] [En Abstj (REP.MB-2404)
This paper describes various Cercospora species, including C. cruenta on
leaves, stems and pods of Phaseolus spp. and Vigna mungo. [THHJ
*0370 Latham, D.H. 1934. Life history of a Cercospora leaf spot fungus of
cowpea. MYCOLOGIA, v.26:516-527. [Enj [En Abst] (REP.MB-2390)
This report deals with a fungus, here designated by the new combination
Mycosphaerella cruenta, that causes a leaf and stem spot disease of cowpeas.
Lesions on the leaves are usually irregular and reddish brown. Those on the
stems have not been observed to bear conidia. The fungus has three spore forms
in its life cycle. Two of these are herein described for the first time. This
disease has previously been attributed to the conidial stage, Cercospora
cruenta Sacc., but evidence of the genetic connection between this conidial
stage and its newly found spermogonial and perithecial stages is given. The
pathogen has been isolated in pure culture from conidia and from ascospores,
both of which gave rise to typical Cercospora conidia. The pathogenicity of
this fungus has been established by inoculation experiments with conidia and
with ascospore-s. Mungbean is among the hosts of Cercospora cruenta. [AS/THHJ
*0371 Preston, D.A. ; Ray, W.W. 1943. Yeast spot of soybeans and mungbeann
caused by Jematospora coryli Peglion in Oklahoma. PLANT DISEASE REPORTER,
v.27:601-602. [En] [En Abst] (REP.MB-2469)
This note describes a yeast-like fungus, Nematospora coryli, which causes a
disease of soybean seeds and also attacks mungbean. [EMS]
*0372 Ahmed, Q.A. 1949. Varietal resistance and susceptibility of Phaseolus
radiatus towards Cercospora. SCIENCE AND CULTURE, v.14(10):436. [En]
(REP.MB-0038)
A severe leaf spot disease, probably due to Cercospora cruenta, was
observed in the Dacca University Botanical Garden on three mungbean varieties
viz., Hali-mung, Krishna-mung, and Sona-mung. Sona-mung was much more resistant
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