A new technique for estimating density of the field slug (Deroceras reticulatum (Muller))
Ferguson, C.M.; Barratt, B.I.P.; Jones, P.A.
Monograph - British Crop Protection Council 41: 331-336
A quantitaive method developed in New Zealand for estimating the density of the slug Deroceras reticulatum in the field is described. A defined-area trap (DAT) was used in pasture and compared with accepted methods of cold water extraction from soil samples, and with surface searching. DATs gave results comparable to soil sampling methods but with considerable savings in time and labour. Surface searching understimated slug density.