ROLES OF MICROBES IN BIOCONTROL BY ANKIT CHOUDHARY.ppsx

By Ankit Choudhary

1. INDIRA GANDHI KRISHI VISHWAVIDYALAYA, RAIPUR (C.G)
COLLEGE OF AGRICULTURE, RAIPUR
SESSION-2023-24
COURSE TITLE :-SOIL BIOLOGY AND BIOCHEMISTRY
COURSE NO. :-SOILS-506
COURSE CREDIT :-3(2+1)

2. Submitted To
Dr. Dipti MayeeDash
Department of Agricultural Microbiology
Submitted By
1.Jaya Verma
2.ShivanginiSingh
3.AerraSnehitha
1.Ankit Choudhary
2.Asumal Bhai Patel
3.Rahul
M.Sc. Agricultural Microbiology

3. Role of Microbes
in:Biocontrol
Understanding the Diverse Roles of Microorganism

4. Microbes
●Microbes are tiny living things that are
found all around us and are too small to be
seen by the naked eye.
●They Live in Water, soil, and in the air. The
human body is home to millions of these
microbes too, also called microorganisms.
●Some microbes make us sick, other are
important for our health.

5. What is Bio-Control?
Bio-control can be simply defined as the
application of one living organism to
control another.
Bio-control is a method of controlling
pests such as insects, mites, weeds and
plant diseases by using other organisms.
This process is also referred to a
biological control.

6. ●Biocontrol is the use of biological methods for
controlling plant diseases and pest. E.g. Lady Bird
(Beetle)control Aphid. Dragon Flies control
mosquitoes.
●Chemical pesticides and insecticides kill both useful
and harmful organism and cause pollution.
●Biocontrol methods has no such problems.
Microbes as
Biocontrol Agents
Aphid
Lady Bird (Beetle)

7. Microbial Biocontrol Agents
Bacillus thuringiensis (Bt): To control butterfly
caterpillar.
The dried spores of Bt (available in sachets) are
mixed with water and sprayed on to vulnerable
plants such as brassicas and fruits trees. These are
eaten by the caterpillar. In their gut, the toxin is
released and the larvae got killed. The scientists
have introduced B. Thuringiensis toxin genes into
plants. E.g. Bt cotton.

8. Microbial Biocontrol Agents
●Trichoderma spp. (fungus):
These are free livings presents in the root
ecosystems. They control several plant pathogens.
●Baculoviruses (Especially genus
Nucleopolyherdro):Attacks insects and other
arthropods.
It is suitable for species-specific, narrow spectrum
insecticidal applications and desirable in IPM
(Integrated Pest Management) program to conserve
beneficial insects.

9. ●Bio-fertilisers are organisms that enrich nutrient
quality of the soil. E.g. Bacteria, fungi,
cyanobacteria etc.
●Rhizobium (symbiotic bacteria in root nodules of
leguminous plants) fix atmospheric N2.
●Free-living bacteria in the (E.g. Azospirillum and
Azotobacter) enrich the nitrogen content of the
soil.
Microbes as
Biofertilizers

10. Microbes as Biofertilizers
The fungal symbiont performs the following:
●Absorb phosphorus from soil and passes the plant.
●Biofertilizers are organisms that enrich nutrient
quality of the soil. E.g. Bacteria, fungi,
cyanobacteria etc.
●Rhizobium (symbiotic bacteria in root nodules of
leguminous plants) fix atmospheric N2.
●Free-living bacteria in the soil (E.g. Azospirillum
and Azotobacter) enrich the nitrogen content of the
soil.
●Mycorrhiza: Symbiotic association of fungi (Genus
of Glomus) with plants. The fungus get food from
plant.

11. The fungal symbiont performs the following:
●Give resistance to root-borne pathogens and tolerance to
salinity and drought.
●Give overall increase in plant growth and development.
●Cyanobacteria (Blue green Algae): Autotrophic microbes.
They fix atmospheric nitrogen. E.g. Anabaena, Nostoc,
Oscillatoria etc. In paddy fields, Cyanobacteria serve as an
important biofertilizers
Microbes as
Biofertilizers

12. How Does Biological Control
Works
Advantages:
●The biological control agents are environmentally
friendly and cause no side effects.
●Decrease disease intensity.
●Safe for the users and the farming community.
●Provide natural long term immunity to crops and soil
●Play a key role in integrated management of diseases.
●Reduce undesirable effects from chemical pesticide.
●Easily available, easy to use and is effective throughout
the season.

13. Conclusion
●Biological control or Biocontrol is a
process of controlling pests such as
mites, insects, weeds and plant disease
using some other animals.
●Biological control agents offer and eco-
friendly and economic alternative to use
of toxic chemicals for control of various
parasites.
●Biological control can have side-effects
on biodiversity through attacks on non-
target species by any of the same
mechanisms, especially when a species
is introduced without through
understanding of the possible
consequences.