Susceptibility of entomopathogenic nematodes to nematode-trapping and endoparasitic fungi
Sloun, P. van (Bonn Univ. (Germany, F.R.). Inst. fuer Pflanzenkrankheiten) | Nicolay, R. | Lohmann, U. | Sikora, R.A.
Laboratory tests in petri dishes demonstrated that the nematode-trapping fungi Arthrobotrys superba and A. robusta preyed upon the entomopathogenic nematodes Steinernema bibionis, S. feltiae and a species of Heterorhabditis. Up to 100 per cent of the nematodes were trapped 48 h after application. Large differences existed in the time required for trapping as well as for mortality after trapping and was dependent on the fungal or nematode species studied. Arthrobotrys robusta reduced S. bibionis densities in sand-block bioassay chambers. The prior introduction of a microphagous nematode, Panagrellus redivivus, to induce trap formation caused a 52 per cent reduction in S. bibionis levels. The endoparasitic fungi Harposporium anguillulae and Drechmeria coniospora did not parasitize the entomopathogenic nematodes in petri dish tests. However, Verticillium balanoides, was shown to be a parasite of S. bibionis. P. redivivus and a mycophagous species of Ditylenchus were more quickly parasitized than S. bibionis, with parasitism reaching 100, 90 and 30 per cent after 42 days, respectively. In the sand-block chambers V. balanoides did not reduce the number of recovered S. bibionis juveniles after 14 or 28 daysShow more [+] Less [-]