biological control of nematodes-ssnaik tnau
TRANSCRIPT
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WEL COME
(www.ncbi.nlm.nih.gov)
SSNAIKTNAUI Ph.D
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BIOLOGICAL CONTROL BIOLOGICAL CONTROL OF NEMATODES OF NEMATODES
TERM PAPER PRSENTATION ON
NEM 611DEPARTMENT OF NEMATOLOGY
CPPS,TNAU,COIMBATORE-641 003
NAME :SABHAVAT SRINIVASNAIKID. NO: 2015800506YEAR: I Ph. D (2015)DEPT.: AGRICULTURAL ENTOMOLOGY
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Introduction
PART I
PART II
PART III
INDEX
Biological control
Advantages Disadvantages
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Introduction
PART I
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Plant parasitic nematodes PPNs -leading biotics causing yield losses in different crops Small about 0.5 to 3 mm unsegmented worms Can affect the crops in different ways
Altering normal root cell divisionModifying plant cells for nutrient transferTransmitting viruses and creating wounds
Crop loss estimated about US $125 billion annually
(British ecological society report, 2015)
Current- dependent on the highly toxic nematicides
Harmful to the physical environment Reducing the soil flora and fauna
hidden enemies
Biological control
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BIO CONTROL
PART II
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BIO CONTROL “Biological control as the use of living organisms or their
products to eliminate or reduce the damages or losses due to pests” (IOBC, 2014)
“Biological control may be defined as reduction of nematode population that is accomplished through the action of living organisms other than the nematode-resistant host plants, which occurs naturally or through the manipulation of the environment or the introduction of the antagonists” (Stirling, 1991)
(or)
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BIO CONTROL AGENTS
(Walia and Bajaj, 2013)
1. Fungi 2. Bacteria3. Predatory nematodes4. Protozoa 5. Tardigrades 6. Turbellarians 7. Collembolans8. Predatory Mites
Biological control
Fungi Bacteria
Mites
86%
10%2%
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MECHANISMS OF BIOLOGICAL CONTROL4 mechanisms of biological control
parasitisation
Predation
Parasitism
Competition
Antibiosis
Specialized structures –predacious
Food / Space
Toxic compounds
Fungi, nematodes, collembolans, mites and protozoans
Fungi and bacteria
Fungi and bacteria
Fungi and Bacteria http://users.ba.cnr.it/ciancio/nematoda.html
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Fungi Fungi are eukaryotic Spore bearing Achlorophyllous organisms Reproduce sexually and asexually Filamentous, branched somatic structures are typically surrounded by cell
walls consisting chitin or cellulose or both with many organic molecules
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FUNGI MODE OF ACTION Fungi are 4 types: 1. Predacious fungi/capturing2. Endoparasitic fungi3. Egg/cyst parasitic fungi4. Toxin producing fungi
1. Arthrobotrys species 2. Monacrosporium cionopagum3. M. gephyropagum 4. Dactylella lobata 5. D. brochopaga 6. M. doedycoides 7. D. candida 8. D. leptospora9. Drechmeria coniodiospora10. Paecilomyces lilacinus 11. Trichoderma spp.12. Hirsutella rhossoliensis13. Haptoglossa dickii 14. Catenaria anguillulae 15. Verticillium chlamydosporium16. Dactylella oviparasitica(Pandit, 2014)
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FUNGI MOA…
1. Predacious fungi/capturing/carnivorous
Mycelium Adhesive network Attaching knob
Non C. ring Constricting ring Adhesive zoospores (Pandit, 2014)
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FUNGI MOA…
(Pandit, 2014)
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Penetration
Proliferate
Killing
New propagules (spores)
Favorable conditions
FUNGI MOA…
2. ENDOPARASITIC FUNGI
(Pandit, 2014)
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Nematode body
Fungal spore(conidia)
Appressorium
Germ tube
Infected nematode body
Multiplication of the hyphae
Under favourable conditions
(Pandit, 2014)
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BACTERIA Soil is a dynamic natural resource (Doran et al.,1996). Insects, nematodes, bacteria, algae, fungi, earthworms The microbial populations 10,000/g of soil (Torsvik et al., 1990). Few potential biocontrol agents of phytonematodes. Fungi and bacteria are common parasites of nematodes (Davies, 1998)
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BACTERIA NA Cobb reported the first bacterial disease of nematode in 1906
Thorn described it as protozoan in 1940
Electron Microscopy and prokaryotic nature it describes as bacteriaBacillus penetrans (Mankau, 1975)
Presently the groups of the organisms described under Genus Pasteuria (Sayre and Starr 1985)
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MODE OF ACTION OF BACTERIA Disease producing bacteria
Toxin producing bacteria
Pathogenic to the nematode Secretions/metabolites/toxins
Pasteuria penetrans, P. thornei , P. nishizawae
Agrobacteriumm radiobacterAzotobcater chrococcumBacillus thuringiensisB. cereus, Clostridium spp. Pseudomonas spp.Streptomyces spp
Spores which attach to the nematode, penetrate the cuticle/epidermis- reproduces inside the nematode
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Predacious Nematodes Mononchid
Dorylaimd Seinura Diplogasterids Tripylid
Wide buccal cavity with
teeth/denticle
Odontostyle Similar to PPN
Spacious stoma +movable teeth
Tube +one or more teeth on dorsal/ventral
wallsKader, 2008
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Mononchus nematodes are predatory, meaning they feed on other animals, other nematodes
Damp soil, sand or gravel on the shore of a water source, or on the bottom of a lake, pond, stream, river, or marsh
Nematodes are transparent, meaning you can see through them. If they have colour, you're just seeing what they ate.
Young Mononchus eat microscopic creatures, such as Amoeba, Paramecium, Euglena, etc.. Adult nematodes attack protists as well as Rotifers, Water Bears, Aquatic Worms, and other nematodes. Mononchus will show cannibalism also.
The mouth of a Mononchus has a "tooth" that it uses to grab prey. Then the nematode swallows it whole
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Protozoa Single celled organisms Unicellular eukaryotic organism Motility and predation Primitive non photosynthetic simplest organisms 4 groups were found
1. Flagellates 2. Amoeboids 3. Sporozoans 4. Ciliates
Theratromyxa weberi
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Mode of action Protozoa
Which attaches to the nematode then engulfs and digests the nematode
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Tardigrades Tardigrades -water bears or moss piglets Water-dwelling, segmented micro-animals, with eight legs withstand temperatures above absolute zero to100 °C, The name Tardigrada (meaning "slow stepper") was given
three years later by the Italian biologist Lazzaro Spallanzani Mountain tops to the deep sea, from tropical rain forests to the
Antarctic
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Mode of action of Tardigrades
Captures nematodes pierce the cuticle and then suck out the contents of the nematode body.
Nematode
Tardigrade
http://plpnemweb.ucdavis.edu/nemaplex/Ecology/antagoni.htm
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Turbellarians (flat worms) Sub division of the Platyhelminthes 4500 species Moist terrestrial and aquatic habitat Flat/ribbon/leaf like Lack of respiratory and circulatory system Diffusion mechanism Most are predators. Size 1mm to 600mm Nocturnally active
Kingdom : Animalia Phylum : Platyhelminthis Class : Turbellaria
Example: Adenoplea sp., MOA :Predatory flatworm which captures nematodes, pierces the cuticle and then swallows the entire nematode.
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Predatory mites 1938: Linford and Oliviera: first report on predatory mite 1957: Murphy and Doncaster: Heterodera cyst injury by mite1965: Rockert and Woodring: Oribited mite Pergalumna sp. on Pelodera lambdiense and Tylenchorhynchus martini1972: Rodriguez : Mite culture Macrocheles muscaedomesticae on Rhabditis sp.1976: Muraoka and Ishibishi : 41 species feed on Cephalobus 1983: lmbriani and Mankau : Neostigmatid mite Lasioseius sculpatus on Aphelenchus avenae and Cephalobus sp.
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COLLEMBOLANS Minute insects Body is globose and tubular Compound eyes are absent Several ocelli form -eye patch Antennae is 4 segmented Mouth parts are entognathous (pouch) Primarily wingless insects Leaf litter and moistened soil Abdomen sex segmented I segment : Ventral tube/Collophore/Glue peg III segment : Hamula/Tenaculum/Retinaculum IV Segment: Furcula/Springing organ Malpighian tubules, tracheal system and metamorphosis
absent
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COLLEMBOLANS
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TNAU COMMERCIAL FORMULATIONS
Bacillus thuringiensis subsp.israelensis Bacillus thuringiensis subsp.kurstaki Bacillus thuringiensis subsp.galleriae Trichoderma viride Trichodermo harzianum Bacillus sphaericus Pseudomonas fluorescens
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ADVANTGES &DISADVANTAGES
PART III
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ADVANTAGES
Host specificity. No problem of toxic residue. No evidence or absence of resistance. No problem of cross resistance. Conventional technique or methods for applications. Permanent control of pest or long persisting effect. Ideally suited for integration with most other plant
protection measures used in INM programme. No fear of environment pollution and hence ecofriendly.
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DISADVANTAGES
High selectivity or host specificity. Requirement of additional control measures. The correct time of application. Delayed effect or mortality. Storage problem. Difficulty of culturing in large quantities. Short residual effectiveness.
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Conclusion In fact synthetic organic
pesticides played a major role in suppression of the nematodes but its 3 R’s, harmful effects on the human beings and biodiversity of soil, there is a need to go for the biological control using different antagonists like fungi, bacteria, nematodes, mites, collembolans, tardigrades, turbellarians, and also solely dependent on the biocontrol agents cannot give in time control. So there is a need to combine them with other ecofriendly pest management methods like Integrated nematode management for effective control.
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Please keep watch......
1. Tardigrade predation 2. Mononchid predation3. Labronema predation
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Thank You
Presented bySabhavat Srinivasnaik
ID.NO:2015800506I Ph. D (Agrl. Entomology)