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Sakthivel, N.

Secondary Metabolite Production by Bacterial Antagonists

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Authors

J. Pathma ¹, G. R. Rahul ¹, Kennedy R. Kamaraj ¹, R. Subashri ¹, N. Sakthivel ¹

Affiliations
1 Department of Biotechnology, School of Life Sciences, Pondicherry University, Kalapet, Puducherry, 605014, IN

Source

Journal of Biological Control, Vol 25, No 3 (2011), Pagination: 165-181

Abstract

Secondary metabolites are low molecular weight compounds, less than 2.5 KDa produced during the idiophase of bacterial growth. Bacteria belonging to Pseudomonas, Bacillus and Streptomyces are prolific producers of secondary metabolites that include a wide array of naturally produced compounds viz., peptides, polypeptides, cyclic lipopeptides, polyketides, pyrroles, phenazines, phloroglucinols, lantibiotics, bacteriocins, lactones, macrolactone, anthracyclines, alkaloids, quinones, polyenes, pyrone, quinolones, isoquinoline, aminoglycosides, macrolides, bithiazoles, isocoumarins, aminosugars, phospholipids, siderophores and volatiles. These metabolites exhibit remarkable antimicrobial, plant growth regulatory, plant enzyme inhibitory, herbicidal, insecticidal and anti-parasitic properties. All these biological properties paved way for the use of these secondary metabolites as biocontrol agents in agriculture. Use of microbial antagonists and their secondary metabolites in agriculture in the place of agrochemicals could alleviate pollution hazard.

Keywords

Secondary Metabolites, Bacterial Antagonists, Pseudomonas, Bacillus, Streptomyces..

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References

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Field Performance of Three Exotic Parasitoids Against Papaya Mealybug, Paracoccus marginatus (Williams and Granara De Willink) Infesting Cassava in Tamil Nadu

Abstract Views :267 | PDF Views:115

Authors

N. Sakthivel ¹

Affiliations
1 Research Extension Center, Central Silk Board (CSB), Inam Karisal Kulam (Post), Srivilliputtur 626 125, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 27, No 2 (2013), Pagination: 83-87

Abstract

The papaya mealybug, Paracoccus marginatus an invasive polyphagous exotic pest assumed alarming status in Tamil Nadu during 2009–2010 because of its sudden outbreak on number of crops. Three encyrtid parasitoids viz., Anagyrus loecki, Acerophagus papayae and Pseudleptomastix mexicana were released in cassava gardens severely infested by papaya mealybug in 3 locations each at Salem, Namakkal and Dharmapuri districts of Tamil Nadu @ 200 individuals per location during November, 2010. An average of 6.08% parasitism and 11.51% reduction in P. marginatus population was noticed a month after release of parasitoids with a corresponding increase in percent parasitism @ 2, 3, 4 & 5th months. The population of P. marginatus from the tapioca garden was eliminated up to 93.15% @ 6th month corresponding to 76.33% parasitism. Among the parasitoids released, highest proliferation and field activity was observed in the case of A. papayae accounting for 80.89 – 94.31% parasitization and P. mexicana registered comparatively lesser performance (5.69 – 19.11%) whereas the field establishment of A. loecki was not noticed during the study period.

Keywords

Cassava, Paracoccus marginatus, Parasitoids, Anagyrus loecki, Acerophagus papayae and Pseudleptomastix mexicana, Field Efficacy.

Full Text

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Ecofriendly Management of Pseudodendrothrips mori Niwa and its Impact on Abundance of Predatory Coccinellids in Mulberry Ecosystem

Abstract Views :285 | PDF Views:140

Authors

N. Sakthivel ¹

Affiliations
1 Regional Sericultural Research Station, Central Silk Board, Government of India, Allikkuttai (Post), Salem – 636017, Tamil Nadu, IN

Source

Journal of Biological Control, Vol 33, No 2 (2019), Pagination: 143-146

Abstract

Efficacy of neem oil, pongamia oil, spray of strong jet of water, and the recommended pesticide, dichlorovos (76 EC) when compared to the untreated control against the thrips, Pseudodendrothrips mori Niwa (Thysanoptera: Thripidae) infesting mulberry as well as their bio-safety to the predatory coccinellids were studied under field conditions. Two numbers of sprays were effected, i.e., first at 10 Days After Pruning (DAP) of mulberry garden and second at 20 DAP with the treatments asT₁=Two sprays of neem oil, T₂=Two sprays of pongamia oil, T₃=Neem oil followed by pongamia oil, T₄=Pongamia oil followed by neem oil, T₅=Neem oil followed by water jetting, T₆=Pongamia oil followed by water jetting, T₇=Two numbers of water jetting, T₈=Dichlorovos followed by water jetting, T₉=Two spray of Dichlorovos and T₁₀=Untreated Control. The population of thrips and predatory coccinellids were recorded one day prior to each spray and @ 1, 3, 7 and 10 days after each spray up to 30 DAP. The mean values revealed that highest reduction in thrips population (84.35%) was recorded with two numbers of water jetting (T₇) and next best treatments were T₈ dichlorovos followed by water jetting (75.17%) and T₅ neem oil followed by water jetting (67.02%). With respect to the abundance of predatory coccinellids highest population (6.83) was recorded in the plots treated two times with water jetting, spray of pongamia oil followed by water jetting (4.82) and neem oil followed by water jetting (4.31), whereas least population was recorded with two sprays of dichlorovos (1.04). Among the various treatments, two sprays of forcible jet of water (water jetting) in 10 days interval were found superior in reducing the population of thrips and to conserve the predatory coccinellids in mulberry ecosystem.

Keywords

Mulberry Thrips, Neem Oil, Pongamia Oil, Predatory Coccinellids, Pseudodendrothrips mori, Water Jetting.

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