The ecology of immature phases of trichostrongyle nematodes: IV. Larval populations on lowland pastures

Abstract

1. Permanent and temporary pastures were examined using a modification of Taylor's method. 2. The goodness of fit of Neyman's Contagious Distribution Type A when applied to larvae on pastures is discussed. 3. Examination of permanent pastures over a period of 3 years showed that the difference in time of maximum infestation was greater between fields in the same year than between years for the same field. 4. Counts made on pastures where disease had occurred showed reasonably close agreement with Taylor's estimate. 5. No larvae were detected on fields after ploughing and reseeding. 6. The number of larvae per lb. of herbage on reseeded pastures was low, but the growth of grass masked the fact that the total population was relatively high at the end of the season.