Journal
ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA
Volume 98, Issue 3, Pages 329-337Publisher
WILEY
DOI: 10.1046/j.1570-7458.2001.00789.x
Keywords
Heterorhabditis megidis; Otiorhynchus sulcatus; Galleria mellonella; host finding; plant roots; Y-tube olfactometer
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The host-searching behaviour of Heterorhabditis megidis strain NLH-E 87.3 in the presence of insect hosts and plant roots, offered individually and in combination, was studied using a newly developed Y-tube olfactometer filled with sand. Within a period of 24 hours infective juveniles (IJs) were significantly attracted to living G. mellonella larvae and caused 100% larval mortality. Otiorhynchus sulcatus larvae, however, did not elicit host-oriented movement of IJs and no larval mortality was observed. Roots of strawberry plants induced a negative response in IJs. The combination of strawberry roots and O. sulcatus larvae, however, strongly attracted IJs leading to 37% host mortality. It was shown that this type of Y-tube choice arena is a useful tool in studying the searching behaviour of entomopathogenic nematodes in a semi-natural habitat.
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