| natural enemies associated with sirex noctilio (hymenoptera: siricidae) and s. nigricornis in ontario, canada. | sirex noctilio f. is an exotic woodwasp now found in eastern north america where it shares natural enemies with native woodwasps of pinus spp. to study the extent to which native hymenopteran parasitoids and parasitic nematodes could affect woodwasp populations, 60 pinus trees with symptoms of s. noctilio attack were felled in 2007 and 2008 in ontario, canada. each tree bole was cut into 1-m sections that were placed in individual rearing tubes; emergence was monitored from may to november of th ... | 2012 | 22507001 |