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… after sprays can cause fenthion to leach out of the soil and still be detectable five months later (Cheke et al. … residues in the air for 64 hours and for 46 days in soil was reported by van der Walt (2000). Recently there was … Press, pp 293–316. Jarvis, M.J.F. & La Grange, M. (1989) Conservation, quelea control and the trap roost concept. In …