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Synergistic effect of an ultraviolet feeding cue for an avian repellent and protection of agricultural crops

By Scott J. Werner, Shelagh T. DeLiberto, Susan E. Pettit, Anna M. Mangan

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Abstract

Application strategies for avian repellents are needed to maintain efficacious repellent concentrations throughout the period of needed crop protection. We investigated the repellency of an ultraviolet (UV) feeding cue in the absence of postingestive consequences, the combination of the UV feeding cue and an UV-absorbent, postingestive repellent (i.e., a repellent that causes negative postingestive consequences), and a non-UV feeding cue combined with the UV-absorbent, postingestive repellent in red-winged blackbirds (Agelaius phoeniceus). In the absence of negative postingestive consequences, 0.2% of the UV feeding cue (wt/wt) was not aversive relative to untreated food (i.e., baseline preference test; P=0.1732). Relative to the repellency of food treated only with the anthraquinone-based repellent, synergistic repellency (i.e., 45–115% increase) was observed when 0.2% of the UV feeding cue was combined with 0.02% or 0.035% anthraquinone (wt/wt). In contrast,

Publication Title Applied Animal Behaviour Science
Volume 159
Pages 107-113
ISBN/ISSN 0168-1591
DOI 10.1016/j.applanim.2014.06.012
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Tags
  1. consequences
  2. Cues
  3. Feeding behavior
  4. Repellents and Attractants