Comparative toxicity of certain medicinal plants against invasive chili thrips, Thrips parvispinus (Karny)

T Elaiyabharathi; G Satya bhanu; T Saikumar; A Suganthi; C Kavitha; M Karthikeyan

doi:10.14719/pst.6328

Authors

T Elaiyabharathi Department of Medicinal and Aromatic Crops, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, India https://orcid.org/0000-0003-4245-1689
G Satya bhanu Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003 Tamil Nadu, India https://orcid.org/0009-0004-4260-5398
T Saikumar Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003 Tamil Nadu, India https://orcid.org/0009-0007-6989-4582
A Suganthi Department of Agricultural Entomology, Tamil Nadu Agricultural University, Coimbatore 641 003 Tamil Nadu, India https://orcid.org/0000-0001-7013-4459
C Kavitha Department of Fruit Science, Tamil Nadu Agricultural University, Coimbatore 641 003, Tamil Nadu, India https://orcid.org/0000-0002-4205-9153
M Karthikeyan Centre for Crop Health, School of Agriculture and Environmental Science, University of Southern Queensland, Toowoomba, Queensland 4350, Australia https://orcid.org/0000-0003-0816-4096

DOI:

https://doi.org/10.14719/pst.6328

Keywords:

chilli, chilli thrips, ecofriendly management, LC50, leaf extract, medicinal and aromatic plants, mortality, T. parvispinus

Abstract

Chilli thrips, Thrips parvispinus, is an invasive pest causing significant yield losses of up to 80%. To manage this, pest farmers rely only upon insecticides and this situation leads to insecticidal residues being higher than the maximum residual level (MRL). To find out alternative strategies to insecticides, a laboratory bioassay was conducted to evaluate the effectiveness of leaf extracts from medicinal and aromatic plants, including Adhatoda vasica, Andrographis paniculata and Coleus aromaticus, against T. parvispinus. The plant extracts were tested at a concentration of 20%, and adult mortality was observed within 24 h of exposure. The results showed that A. vasica leaf extract had the highest toxicity with an LC50 of 7.90%, followed by A. paniculata with an LC50 of 11.14%, and C. aromaticus with the lowest toxicity at an LC50 of 13.92%. A field study was also conducted to evaluate the efficacy of A. vasica leaf extract against the invasive thrips, T. parvispinus, in chilli under field conditions. The results indicated that A. vasica leaf extract at 5 mL/L (43.91 to 45.52%) and 7 mL/L (49.32 to 50.98%) were the most effective doses against T. parvispinus at both locations, besides being safer to natural enemies chilli. The present findings confirm that A. vasica leaf extract (10%) could be a potential eco-friendly alternative to chilli farmers against T. parvispinus.

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