Moong crop diseases A Lecture by Mr Allah Dad Khan

2. Moong Crop Diseases
A Presentation To IPM Course/FFS
Participants
By
Mr. Allah Dad Khan
Provincial Coordinator IPM KPK For
MINFAL Pakistan

3. Symptoms
 This disease caused by the
fungus, Podosphaera fusca, is favoured by
cooler growing conditions and is often
widespread in late crops. Infection
becomes apparent during February, and
usually increases in severity during the
March-April period. It can be particularly
severe during the autumn period if crops
are also under moisture stress.
 Symptoms consist of greyish-white fungal
growth on the surface of leaves, stems and
pods. It can cause significant yield loss if it
develops before or at flowering,
particularly if the crop is under moisture
stress. Late infections during the pod-
filling stage can cause leaf drop but do not
appear to seriously affect yield.
Powdery mildew

4. Symptoms
 While charcoal rot
(Macrophomina phaseolina) can
cause infected plants to die
prematurely and may reduce
yield, its biggest impact is upon
the marketability of sprouting
grade beans. Seed borne
infection creates a soft, wet rot of
the sprouts during the
germination process. Many of
our overseas sprouting markets
now specify that the seed must be
free from the presence of
charcoal rot fungus, and require
that seed be tested before it is
offered for sale.
Charcoal rot

5. Symptoms
 This is a bacterial infection
(Gluconobacter spp.) that occurs
following the overproduction of
sugar by the floral nectaries on
the mungbean plant. The
condition is triggered by a
combination of heat and
moisture stress, and causes
extensive gumming and foaming
of pods during the early stages of
their development. This can be
followed by collapse of the stalks
supporting the pods, and then
pod drop.
Gummy pod

6. Symptoms
 Is a seed-borne bacterial disease
caused byPseudomonas savastanoi
pv. phaseolicola and first recorded in
Queensland in the mid-1980s. In
more recent seasons halo blight has
caused significant losses on the
Darling Downs and has also been
identified in Central Queensland.
Symptoms typically develop under
cool, humid conditions following
rain, most notably in spring
mungbean crops. Significant yield
losses can result if the disease
appears before flowering or during
pod development
Halo blight

7. Symptoms
 This disease is caused
by Curtobacterium
flaccumfaciens and is often
present at a low level in most
crops.
 Symptoms consist of large,
irregular, dry, papery lesions on
leaves that coalesce to form large
brown dead areas, commonly
with yellow margins around the
dead leaf tissue. These areas dry
out to a tan coloured patch,
which may tear and fall out,
giving the leaf a ragged
appearance.
Tan spot

8. Symptoms
 Tobacco streak virus (TSV) was
identified in 2007 in mungbean
crops in the Central Highlands region
of Central Queensland, which caused
a minor to severe impact on yields.
Thrips are the only known vector of
TSV, that is, they can transfer virus-
infected pollen. Several common
broadleaf weed species are hosts of
TSV with parthenium weed being a
widespread and key host of the virus
in central Queensland. The physical
damage caused by thrips feeding on
the plant allow infected pollen to
enter the mungbean plant where the
virus multiplies.
Tobacco streak virus

9. Symptoms
 The disease starts as small
yellow specks along the
veinlets and in severe form
covers the entire lamina.
Whitefly (Bemisia
tabaci) transmits this
geminivirus in the
persistent (circulative)
manner. The host range is
confined mostly to
members of
the Leguminosae family.

Mung Bean Yellow Mosaic