Transcript - Post Graduate Government College

STERILE INSECT
RELEASE
METhOD
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
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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
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.
PINK
Infecundity in females
 Sperm inactivation
 Inability to mate
 Dominant lethal mutation in
reproductive cells of male or female
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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
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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
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(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
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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
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(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
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(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
Thank you