The migratory black cutworm moth, Agrotis ipsilon (Lepidoptera: Noctuidae) (Hufnagel) is a sporadic pest of corn. The larva drills or cuts seedlings at the base, reducing plant stands as severely as 75 - 90% in individual fields. If no protection against this pest is in place at planting, extensive scouting is required to assess the need for rescue treatments. The aim of my research is to test new technologies, such as genetically modified corn events and novel seed treatments, and ultimately incorporate the most effective of these strategies into black cutworm management programs in Ontario no-till corn. This is being accomplished through controlled micro plot experiments, on farm field trials and laboratory bioassays as well as the study of the early spring phenology of the insect.
I will present an overview of the effectiveness of two Bt corn events (Cry 1F and Cry 9C) and a neo-nicotinoid seed treatment (Clothianidin). To determine whether sufficient protection against cutworm is provided by Cry 1F Bt corn hybrids or Clothianidin seed treatments alone or in combination, a number of laboratory bioassays, microplot experiments and field trials were conducted in 2002 and 2003. Bt treatments are most effective against early instars of black cutworm, but later instars are generally present in the field by the time the corn emerges. Clothianidin shows some promise in the control of later instars, but is most effective at high treatment rates. Trials comparing the treatments under field conditions are currently under way.
Species 1: Lepidoptera Noctuidae Agrotis ipsilon (black cutworm)
Keywords: clothianidin, Cry1F
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