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SUMMARY.With a view to the winter control of the cucumber woodlouse the action of a number of compounds has been tested. Observations are described on the effects due to contact, vapour and mixing with the soil.The organism of the animal is not affected in a similar manner by different compounds. p‐Cresol and p‐Nitrophenol are less active than the corresponding ortho‐compounds and both nitro‐phenols are less active than phenol.Certain compounds show a maximum activity shortly before their disappearance from the soil. Phenol and the cresols were the most active compounds tested. Naphthalene ceases to act in the soil on the fourth day after mixing.