1. POST GRADUATE GOVERNMENT
COLLEG SEC 11 CHANDIGARH )

2. STERILE INSECT RELEASE METhOD

3. Sterile insect The reproductive potential of insect is change
The sterile insect achieved by physical or chemical agent
The steril insect release method controlled the population of pest

4. METOD OF STERILITION PYSICAL STERILANT ---
Insect steriled by exposure to ionizing radiation such as X rays and Gama rays
And released in infested region
Compete for mates with normal insects
The pest population is reduced or wiped out PINK BOLLWORM completely
EXAMPLE– When lepidoptera adult are treated
with certain doses of radiation (5 to 12 krad), their F1 progeny will contain chromosomal translocations, which will cause varying amounts of reproductive sterility in those F1 progeny. This picture demonstrates massive chromosomal translocations in an F1 male whose father received 6 krad of gamma radiation.

5. Radiation cause sterility
Infecundity in females
Sperm inactivation
Inability to mate
Dominant lethal mutation in reproductive cells of male or female

6. Chemosterilant
Sterility produced in pests by chemical is called chemosterilant
Chemical administered orally or by contact to a wide variety of insect
It disrupt reproductive cycle at various stages
The chemicals may disrupt the reproductive process of female and male insect respectively is called female chemosterilant and male chemosterilant

8. Type of chemosterilant
Chemosterilant divided into tree group
1. Alkylation Agent --
Specially effective as a male sterilant
Alkylation is a substitution of an alkyl group from a hydrogen atom
(a) aziridined and non aziridines
(b) sulphuric acid esters
(c)nitrogen mustards
2. Antimetabolites– female sterilant
(a) Analogues of purine ,pyrimictrines
(b) Folic acid
(c) Analogues of amino acids

9. CEMOSTERILANT CAUSE STERILITY
(3) Miscellaneous compound (radiomimmetic cemical )----
These compounds contain radioactive isotopes of carbon , phosphorous, or other elements
Methionine administered to such insects sterilized male
(a) S– triazines – Hemel , Melamine
(b) Posphoramide -- Hempa
(c) Tin derivatives -- Triphenylltin chloride
(d) other miscellaneous agent -- Colchicine , Coumarin
CEMOSTERILANT CAUSE STERILITY
Preventing the development of sperms or ova
Cause death of ova after these have been produced
Injure genetic make up of the sperm or ova tat fertilizd

10. Mode of application OF CEmosterilant
(1) Oral Injection-: Natural food could also sprayed with cemosterilant
Treated food is placed in infested area for insect to eat
Example– housefly population in a poultry house could reduced sharply by applying corn meal bait containing 0.5% metapa to poultry dropping
(2) Topical or contact
(a) Cemosterilants only
2. Insecticide cemosterilant combination
(b) Direct contact wit residues
© Sterile male release method
(3) Injection--- Injection is best procedure for quantitative evaluation of activity

11. ADVANTASES OF CEMOSTERILANT
(1)Reproductive potential of population is reduced of extent sterility is achieved in natural population
(2) bonus effect – If sexual competitiveness of an insect is maintained
Sterile organisms will not be incapable of reproducing but reproductive capacity of normal unsterilized population
(3) Space effect– Sterilized individual from treated environment can move into untreated areas
And Effect reproductive potential of unexposed fertile individual
(4) Population crush –Sterilized individuals will complete wit unsterilized individual for food and shelter in environment during their normal serving period

12. Thank you