Insects (2019) 10 (4 - 108)

Judith M. Stahl, Dirk Babendreier, Cristina Marazzi, Stefano Caruso, Elena Costi, Lara Maistrello and Tim Haye (2019)
Can Anastatus bifasciatus be used for augmentative biological control of the brown marmorated stink bug in fruit orchards?
Insects 10 (4 - 108)
Abstract: The generalist egg parasitoid Anastatus bifasciatus (Geoffroy) (Hymenoptera: Eupelmidae) is the most prevalent egg parasitoid of the invasive Halyomorpha halys (Stål) (Hemiptera: Pentatomidae) in Europe. To assess its efficacy against the pest H. halys and to validate the potential risks for non-target species in a realistic field setting, inundative releases were conducted over three consecutive years in four fruit orchards in Switzerland and Italy. In total, more than 4300 A. bifasciatus females were released, which was equivalent to 11,000 to 26,000 females per hectare, depending on distances between trees in each orchard. Parasitism of freeze-killed sentinel H. halys eggs achieved with the current release strategy was on average 6% (range: 2%–16%) and considered not high enough to effectively suppress the pest. However, the overall impact of A. bifasciatus on the mortality of H. halys eggs was likely underestimated. If pre-imaginal parasitoid mortality (3.3%) and host feeding (6%) are added to the observed parasitism (6%), the actual induced mortality of H. halys eggs may reach more than 15%. Parasitism of lepidopteran non-target species reached an average of 8% and thus, some degree of non-target parasitism after mass releases may be expected. To quantify the impact of the parasitoids in the orchards more precisely, naturally laid egg masses should be used in future trials to include host-finding cues of the host and host plants, and larger scale releases with potentially higher densities of parasitoids should be considered.
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Database assignments for author(s): Dirk Babendreier, Elena Costi, Lara Maistrello, Tim Haye

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
inundative/inoculative release

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Halyomorpha halys	Apple (Malus)	Switzerland
	Halyomorpha halys	Pear (Pyrus)	Italy
Anastatus bifasciatus (parasitoid)	Halyomorpha halys	Apple (Malus)	Switzerland
Anastatus bifasciatus (parasitoid)	Halyomorpha halys	Pear (Pyrus)	Italy