Abstract
Xenylla welchi was used to evaluate toxicity of two herbicide formulations, pretilachlor (50 EC) and pendimethalin (30 EC) under laboratory conditions. Twenty four hours LC50 value of pretilachlor and pendimethalin formulations on Xenylla welchi were 72.7 and 190.0 g a.i/ha respectively which were less than their corresponding recommended agricultural doses. Again pretilachlor attained fastest LT50 (110 min) followed by pendimethalin (140 min). Significant reductions in hatching success were noted with the application of both the herbicide formulations at all doses excepting 1/8 and 1/10th of LC50 (9.1, 7.3 and 23.8, 19.0 g a.i/ha for pretilachlor and pendimethalin, respectively). Hatching success of the test specimens recorded 44.1 and 63.3% reduction from control for the highest applied dose (½ of LC50) of pretilachlor and pendimethalin, respectively. Juveniles of Xenylla welchi exposed to 1/6, 1/8 and 1/10th LC50 for pretilachlor (12.1, 9.1, 7.3 g a.i/ha) and 1/8 and 1/10th LC50 for pendimethalin (23.8, 19.0 g ai/ha) survived and exhibited increased moulting frequency (7 moultings in 28 days in both the herbicide treatments) in comparison to control (8 moulting in 42 days). Test specimens required 26.0 ± 1.2 and 28.1 ± 2.1 days to attain sexual maturity exposed to pretilachlor and pendamethalin respectively which was significantly less than control (42 ± 2.6 days).
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The authors would like to acknowledge Principal, Raja N.L. Khan Women’s College for providing necessary laboratory facilities.
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Haque, A., Das Gupta, R. & Chakravorty, P.P. Effect of Two Herbicides on Xenylla Welchi (Hexapoda:Collembola) Under Laboratory Conditions. Bull Environ Contam Toxicol 86, 583–586 (2011). https://doi.org/10.1007/s00128-011-0277-0
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DOI: https://doi.org/10.1007/s00128-011-0277-0