Abstract
AbstractThe multicoloured Asian lady beetle,Harmonia axyridis(Pallas) (Coleoptera: Coccinellidae), has become a pest in North American vineyards during harvest due to its adverse effects on wine quality. This study evaluated alternative products that may be suitable for use in vineyards as repellents to the beetle. Products were screened as repellent for multicoloured Asian lady beetle in short-term laboratory trials. Thirteen products significantly reduced the number of beetles on grapes,Vitis vinifera(Vitaceae). Products that showed a 50% or greater repellency were evaluated for residual repellency 24, 48, and 72 hours after application. In these trials, pine oil was highly repellent at each testing period, whereas the repellency of most other products decreased over time. Eight repellent compounds were evaluated in field trials in commercial vineyards that had high multicoloured Asian lady beetle populations. The number of beetles on vines was counted 2–6 and 24–28 hours after application. In the field, the most effective repellents overall were Biobenton and Buran, which reduced the number of multicoloured Asian lady beetles by 39 and 34%, respectively. The discovery of new repellents of multicoloured Asian lady beetle provides an opportunity to improve management of the pest in vineyards and to reduce risk of wine taint without using broad-spectrum insecticides.
Highlights
Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), commonly called the multicoloured Asian lady beetle, is a generalist predator native to Asia (Essig 1965)
The multicoloured Asian lady beetle was introduced to North America in 1916 as a biological control agent (Gordon 1985), and it has since become the dominant coccinellid in most habitats in the United States of America and in Ontario, Canada
In long-term trials, multicoloured Asian lady beetles were significantly repelled at every time point using Timorex Gold 15 mL/L (24 hours: F1,9 = 173.8, P < 0.001; 48 hours: F1,9 = 266.5, P < 0.001; 72 hours: F1,9 = 175.2, P < 0.001), pine oil (24 hours: F1,9 = 93.4, P < 0.001; 48 hours: F1,9 = 133.0, P < 0.001; 72 hours: F1,9 = 151.8, P < 0.001), carvacrol (24 hours: F1,9 = 32.9, P < 0.001; 48 hours: F1, 9 = 103.0, P < 0.001; 72 hours: F1,9 = 34.0, P < 0.001), and granite dust (24 hours: F1,9 = 185.8, P < 0.001; 48 hours: F1,9 = 97.5, P < 0.001; 72 hours: F1,9 = 28.0, P < 0.001)
Summary
Harmonia axyridis (Pallas) (Coleoptera: Coccinellidae), commonly called the multicoloured Asian lady beetle, is a generalist predator native to Asia (Essig 1965). The beetle undertakes long-distance dispersal flights from feeding habitats to overwintering sites (Hodek et al 1993) in response to temperature changes (Nalepa et al 2005). It enters vineyards in the autumn and feeds on previously damaged grapes (Koch 2003), but direct yield loss from their feeding is negligible. Economic loss occurs when the beetles are harvested with grapes and release defensive compounds, which can compromise the quality of wine
Sign-in/Register to view highlights & summary 
Published Version (
Free)
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call