Evaluation of Insecticide Chemistries Against the Leek Moth (Lepidoptera: Acrolepiidae), a New Pest in North America
Abstract
The leek moth, Acrolepiopsis assectella (Zeller), is a newly introduced micro-lepidopteran pest in North America that attacks Allium crops, including onion, leek, and garlic. Eggs are laid on leaves and emerging larvae may cause extensive damage by mining leaves, feeding on leaf surfaces and feeding directly on bulbs. Little is known about existing natural enemies for this pest in North America, but classical biological control introductions are underway in Canada. However, other management options are needed because the threat to the onion production industry in New York State and the Great Lakes Region is imminent. Laboratory studies showed that lambda cyhalothrin (Warrior® II), spinetoram (Radiant® SC), methomyl (Lannate® LV), chlorantraniliprole (Coragen®), and spinosad (Entrust®) significantly increased larval mortality, compared to the control, at 2, 4, and 8 days after treatment, while Bacillus thuringiensis and azadirachtin insecticides did not. These results are explained in part by the behavior of the insect.Resumen: La polilla del puerro, Acrolepiopsis assectella (Zeller) es un micro-lepidóptero plaga recientemente introducido en América del Norte, que ataca los cultivos de Allium incluyendo cebolla, puerro y ajo. Los huevos son puestos en las hojas y las larvas recién salidas pueden causar daño severo por las minas que hacen en las hojas, la alimentación sobre la superficie de las hojas y la alimentación directa a los bulbos. Se sabe poco sobre los enemigos naturales existentes para esta plaga en América del Norte, pero están realizando introducciones del control biológico clásico en Canadá. Sin embargo, otras opciones de manejo son necesarias debido a su amenaza inimente a la industria de producción de cebolla en Nueva York y la región de los Grandes Lagos. Ensayos de laboratorio mostraron que el cialotrina lambda (Warrior II), spinetoram (Radiante SC), metomilo (Lannate LV), clorantraniliprol (Coragen) y spinosad (Entrust) aumentó significativamente la mortalidad de larvas, en comparación con el control, a los 2, 4 y 8 dias después del tratamiento, mientras que insecticidas Bacillus thuringiensis y azadiractina no lo hizo. Estos resultados se explican en parte por el comportamiento del insecto.
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