Location: Emerging Pests and Pathogens ResearchTitle: Diapause in Abrostola asclepiadis (Lepidoptera: Noctuidae) may make for an ineffective weed biological control agent
Submitted to: International Congress of Entomology
Publication Type: Proceedings
Publication Acceptance Date: 5/9/2016
Publication Date: 8/15/2016
Citation: Milbrath, L.R., Biazzo, J. 2016. Diapause in Abrostola asclepiadis (Lepidoptera: Noctuidae) may make for an ineffective weed biological control agent. International Congress of Entomology. No. D3458 (https://esa.confex.com/esa/ice2016/meetingapp.cgi/Paper/109039).
Technical Abstract: Pale and black swallow-wort (Vincetoxicum rossicum and V. nigrum; Apocynaceae, subfamily Asclepiadoideae) are perennial vines from Europe that are invasive in various terrestrial habitats in the northeastern USA and southeastern Canada. A classical weed biological control program has been in development. One potential biological control agent is the defoliating moth Abrostola asclepiadis (Denis and Schiffermüller) (Lepidoptera: Noctuidae). It is widely distributed in Europe in open field to forest edge habitats and is reported to have one-two generations per season. The diapausing stage is the pupa. We assessed Russian and French populations of the moth for their potential voltinism under constant and changing photoperiods ranging from 14:10 to 16:8 hr (L:D) at 20C, photoperiods they would experience in the Northeast. For all photoperiod treatments, no to very few adult moths (in a few cases) emerged. Both populations therefore appear to be univoltine. Previous impact data combined with plant population models suggest that a single defoliation event, which this moth would likely cause, will cause population declines in only a limited number of forest and field infestations of swallow-wort. Most swallow-wort populations in open fields are not projected to be controlled by this potential agent.