Definition of Insect Growth Regulator Insect Growth Regulator Mode of action Types of Insect Growth Regulator

1. Department of Entomology, Bhauddin Zakariya University Multan
Topic:
Insect Growth Regulators
Presented By:
Muhammad Zeeshan Nawaz
Department:
Entomology
Bhuaddin Zakariya University
Multan

2. Department of Entomology, Bhauddin Zakariya University Multan

3. Department of Entomology, Bhauddin Zakariya University Multan
 Insects wear their skeletons on the outside.
The skeletons are called exoskeletons.
As the insect grows, a new exoskeleton must be formed inside the old
exoskeleton and the old one shed.
The new one then swells to a larger size and hardens.
The process is called molting.
The changes from larval to adult form, a process called metamorphosis,
also take place during molting.
Hormones control the phases of molting by acting on the epidermis,
which is part of the exoskeleton.

4. Department of Entomology, Bhauddin Zakariya University Multan
Types of
IGRs
Three types of IGRs, different mode of action
Chitin synthesis
inhibitors
Juvenile hormone
analogs and
mimics
Anti-juvenile
hormone agents

5. Department of Entomology, Bhauddin Zakariya University Multan
Chitin synthesis inhibitors
 Prevent the formation of chitin.
Carbohydrate that is an important
structural component of the insect's
exoskeleton.
When treated with one of these
compounds, the insect grows
normally until the time to molt.
When the insect molts, the
exoskeleton is not properly formed
and it dies.
Death may be quick, but in some
insects it may take several days.
As well as disrupting molting,
chitin synthesis inhibitors can kill
eggs by disrupting the normal
development of the embryo.

6. Department of Entomology, Bhauddin Zakariya University Multan

7. Department of Entomology, Bhauddin Zakariya University Multan
Juvenile hormone analogs and mimics
When applied to an insect, these
abnormal sources of juvenilizing agent
can have striking consequences.
For example, calls for a molt to the
pupal stage, an abnormally high level
of juvenilizing agent will produce
another larval stage or produce larval-
pupal intermediates..
Juvenoid IGRs can also act on eggs.
They can cause sterilization, disrupt
behavior and disrupt diapause, the
process that triggers dormancy before
the onset of winter.

8. Department of Entomology, Bhauddin Zakariya University Multan
Anti-juvenile hormone agents
Anti-juvenile hormone agents cancel the
effect of juvenile hormone by blocking juvenile
hormone production.
For example, an early instar treated with an
anti-juvenile hormone agent molts prematurely
into a nonfunctional adult.
A disadvantage of these chemicals is that they
are so selective that they may not be economic
for a manufacturer to develop.