| seasonal availability of nematode larvae on pastures grazed by cattle in new south wales. | trends in the numbers of infective menatode larvae on pasture plots contaminated by cattle at different seasons of the year were defined in 3 different climatic regions. the main nematodes were ostertagia ostertagi, trichostrongylus spp, haemonchus spp and cooperia spp. on the north coast of new south wales with a sub-tropical climate, the numbers of infective larvae of all 4 nematodes rose rapidly to peak levels soon after each seasonal period of contamination began, then fell quickly within a ... | 1980 | 7436894 |