Symptoms

1
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
2

• Symptoms
• Later the chlorotic spots and necrotic rings and
  streaks spread on all the leaflets of plants
  (Fig.) and the plants die.

3

• 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.).

4

• Symptoms
• Early infection results in stunting of plants due
  to multiplication of affected terminal buds
  (Fig.).

5

• Symptoms
• Any seeds produced by early-infected plants are
  small, shriveled, and with spots (Fig.).

6

• 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.
•  

7

• 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.

8
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