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In a field experiment on sandy loam, application of 0,0-diethyl 0-2 pyrazinylphosphorothioate ("Zinophos") 3 weeks after onions had been sown, gave a better control of attack by the stem nematode than treatments 10 days before or 6 weeks after sowing. The treatment was as effective as application of a contact nematicide that would have killed more than 99% of the nematodes. At low initial nematode densities the effect of the treatment on population density after harvest was comparable to thatdoi:10.1163/187529267x00436 fatcat:dua2mtaadbesnado4d5vz26tli