Soil nematode populations beneath faecal pats from grazing cattle treatedwith the ivermectin sustained-release bolus or fed the nematophagous fungus Duddingtonia flagrans tocontrol nematode parasites
Yeates G; Dimander SO; Waller P; Hoglund J
Abstract The size and composition of the nematode assemblage in soil under faecal patsderived from young cattle treated or untreated with either ivermectin sustained-release boluses, orthe nematophagous fungus Duddingtonia flagrans , were studied in each of three years. Soil samplestaken 4, 6, 8 and 10 weeks after four deposition dates in 1998 showed significant temporal effectsin many taxa and treatment effects in a few genera. In 2000, soil samples taken 10 weeks afterdeposition in July, August and September showed treatment effects in the plant-associated Tylenchusand Cephalenchus , and the bacterial-feeding Cephalobus 1 and Cephalobus 2 taxa. However, overall itwas found that the nematode assemblages were similar below all three types of pat, and theassemblages varied with the season of deposition. D. flagrans , the novel biological control agentbeing tested against the free-living stages of nematode parasites of cattle, had no detectableimpact on the size or the structure of the soil nematode communities under the faecal pats.
Keywords Bacterial-feeding nematodes; Cephalobidae; Duddingtonia flagrans;Free-livingstages; Environmental-impact; Sheep; Sweden; Persistence;Avermectins; Efficacy; Pasture; Growth
Acta agriculturae Scandinavica. Section A, Animal science
0906-4702, Volume 53, Issue 4, 2003, Pages 197-206
