Insecticide resistance among field populations of Hyposidra talaca Walker (Geometridae: Lepidoptera) in tea plantations of Assam, India: detection through a biochemical approach

Roy, Somnath; Handique, Gautam; Dutta, Ranjan; Bora, Ashitakshi; Gogoi, Hemanga; Bhattacharjee, Abhilash; Rahman, Azizur; Sarmah, M. C.; Babu, Azariah

doi:10.1007/s12600-021-00883-2

Cited by 7 publications

(2 citation statements)

References 46 publications

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“…Besides the well studied cuticle degrading enzymes and proteins, some more pesticidal secondary metabolites may also contribute in the acaricidal efficacy of the Bacillus spp. Our study through LC-MS profiling of putative pesticidal compounds of the three Bacillus isolates identified a total number of nine (9) metabolites in Bacillus velezensis AB22, six (6) in Bacillus amyloliquifaciens BAC1 and eight (8) in Bacillus subtilis LB22. Four proven insecticidal metabolites, Brevianamide A [34], Heptadecanoic acid [31], Thiolutin [35], and Versimide [36], were also observed in all three studied Bacillus spp.…”

Section: Discussionmentioning

confidence: 89%

“…Tea growers eventually resort to heavy and frequent use of a number of chemical acaricides. Such intensive, prolonged, and repeated use of synthetic pesticides has many disadvantages, such as non-selective destruction of beneficial microbes, chemical residue-driven soil contamination, and development of pesticide resistance [7,8]. Accumulation of pesticide residues above maximum residue limit in processed tea has resulted in restrictions imposed by tea importers.…”

Section: Introductionmentioning

confidence: 99%

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Rhizospheric Bacillus spp. Exhibit Miticidal Efficacy against Oligonychus coffeae (Acari: Tetranychidae) of Tea

Bora,

Gogoi,

Deshpande

et al. 2023

Microorganisms

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Oligonychus coffeae (Acari: Tetranychidae), popularly known as red spider mite (RSM) is one of the major pests of commercial tea (Camellia sinensis (L.) O. Kuntze) plantation world over. Many attempts have been made in the past to control this devastating pest using a variety of microbial bioagents, however, area-wise field success is very limited. We carried out an in vitro study to explore the potential of rhizospheric Bacillus spp. (B. amyloliquefaciens BAC1, B. subtilis LB22, and B. velezensis AB22) against O. coffeae through adulticidal and ovicidal activity. The 100% adult and egg mortality was observed with bacterial suspension (1 × 109 CFU/mL) by B. velezensis AB22, showing the lowest LC50 values for both adults and eggs of O. coffeae, i.e., 0.28 × 105 and 0.29 × 105, respectively. The study also throws some insights into the underlying mechanism through electron microscopy study and identification of some putative pesticidal metabolites from all the species. The three Bacillus species were observed to have four commonly secreted putative bioactive secondary metabolites, brevianamide A, heptadecanoic acid, thiolutin, and versimide responsible for their bio-efficacy against O. coffeae. The outcome of our study provides a strong possibility of introducing Bacillus spp. as a biological miticide and developing synthetic metabolites mimicking the mechanistic pathway involved in microbial bioefficacy.

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