Transcript White grub_0

Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
The adult beetles feed on the
leaves of trees like Neem and
Acacia during nights. They are
small reddish brown beetles.
The female adults enter into
the soil to lay eggs often in
clusters.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
The young grubs are white and
translucent (Fig.).
Fully grown larvae are larger
than a thumb.
The larvae feed on soil organic
matter for a few weeks and
then eat roots. They also
damage pods.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
Crop Damage
The grubs cut and eat the plant
roots, and consequently the
plants will wilt and die.
Severely infested fields have
large patches of dead plants;
the surviving plants are often
stunted, and show signs of
wilt.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
Crop Damage
If the grubs are present at
the time of podding, they
also damage the pods.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
Management
Plants with fibrous roots (sorghum, pearl
millet etc.) are able to withstand white grub
attack better than species with tap roots
(groundnut etc.).
Hence, crops such as pearl millet planted
around the groundnut field act as 'nurseries'
for infestation.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
Management
In areas where white grub is persistent
problem, deep ploughing after harvesting
the crop can reduce the population as birds
can pickup the grubs, and destruction of
pupae.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
Management
Control white grub adults by spraying their
feeding trees like neem etc. with Carbaryl
50 WP at 2 g per liter of water. This
spraying need to be repeated 3 to 4 times
until mid-July, ideally using community
approach.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
Lesson 6: White Grubs
Management
Seed dressing with Chlorpyriphos at 2.5
mL a.i. per kg of seed can suppress white
grub populations.
Application of Carbofuran at 1 kg a.i./ha
in the seed furrows can be effective
prophylactic measure.
Course on Insect Pests of Groundnut
Module II: Economically Important Insect Pests
Virtual Academy for the Semi Arid Tropics
The Lesson 6 on White Grubs in groundnut
crop concludes.
The last Lesson in this Module is about
Bruchids, a stored product pest on
groundnut.
Select Lesson 7 in Module II from Course contents
Course on Insect Pests of Groundnut