Abstract
The recovery of infective nematode larvae (L3) from herbage samples is widely used for the estimation of populations of L3 in pasture. The method described by Parfitt (1955), even as modified by Lancaster (1970), is relatively inefficient and laborious, especially when several herbage samples yielding larve volumes of sediment are being processed and examined. The technique described by Baermann (1917) and modified Persson (1974), using a modified Baermann apparatus, recovered 58-83% of a mixture of Ostertagia ostertagi and Cooperia oncophora added to [cattle] herbage samples. Studies confirmed Persson''s observations. A simplified version of his apparatus and an experimental evaluation of its efficiency are reported.