Transcript PPT - icrisat

Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Symptoms
Symptoms first appear on
young leaflets as faint
chlorotic spots (Right
leaflet in the Fig.) that may
develop into chlorotic or
necrotic rings and streaks
(Left leaflet in the Fig.)
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Symptoms
Later the chlorotic spots
and necrotic rings and
streaks spread on all the
leaflets of plants (Fig.)
and the plants die.
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Symptoms
Terminal buds of plants are
affected when temperatures
are relatively high (Figs.).
Leaflets produced on auxiliary
shoots show a wide range of
symptoms including reduced
size, distortion of the lamina,
mosaic, and general chlorosis
(Figs.).
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Symptoms
Early infection results in
stunting of plants due to
multiplication of affected
terminal buds (Fig.).
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Symptoms
Any seeds produced by
early-infected plants are
small, shriveled, and with
spots (Fig.).
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Management
Use resistant/tolerant cultivars: ICGS 11,
ICGS 44, ICGV 87141, ICGV 87187, ICGV
87119, ICGV 87121, ICGV 87160, ICGV
87157, or ICGV 86590.
Control thrips as the disease is spread by
these insects.
Early sowing (15 June to 15 July) may avoid
the peak disease incidence.
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
Lesson 6: Bud Necrosis / Stem Necrosis
Management
Establish and maintain high plant density
of groundnut crop.
Intercropping of groundnut with cereals
like pearl millet will restrict spread of the
virus.
Avoid groundnut cultivation adjacent to
the crops that are susceptible to bud
necrosis, such as green gram or black
gram.
Course on Diseases of Groundnut
Module II: Economically Important Diseases
Virtual Academy for the Semi Arid Tropics
With this, the Lesson 6 on Bud Necrosis
disease and also the Module II - Economically
Important Diseases conclude.
If you want to check your understanding on
about economically important diseases, please
click on “Exercise” button in Module II
contents.
Next, Module III is about foliar diseases in
groundnut.
Select Module III from course contents
Course on Diseases of Groundnut