Tree Height Influences Flight of Lesser Peachtree Borer and Peachtree Borer (Lepidoptera: Sesiidae) Males |
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Authors: | Ted E Cottrell D L Horton J Fuest |
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Institution: | (1) Agricultural Research Service, Southeastern Fruit and Tree Nut Research Laboratory, USDA, 21 Dunbar Road, Byron, GA 31008, USA;(2) Department of Entomology, University of Georgia, 463 Biological Sciences Building, Athens, GA 30602, USA |
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Abstract: | Capture of male lesser peachtree borer, Synanthedon pictipes (Grote & Robinson), and peachtree borer, S. exitiosa (Say) (Lepidoptera: Sesiidae), in pheromone traps positioned from 0 m to 6 m above ground was affected by surrounding tree
height. In a peach orchard with a 3 m canopy height, more S. pictipes were captured within the canopy zone at 1.8 m than above at 5.5 m. Trap capture was similar for S. pictipes in a mating disruption orchard with more caught at 2 m than at 4 m or 6 m. Capture at 1.8–5.5 m in mixed deciduous woods,
with an average canopy height of 22 m, was not significantly different. In orchards, more S. exitiosa were captured at 1.8 m rather than at 5.5 m but no difference was detected in numbers captured from 0 m to 5.5 m in mixed
deciduous woods. In a peach-pecan interplanted orchard, where pecan trees were three times taller but only one-ninth the density
of peach, capture of both species was similar to capture in peach orchards when traps were entirely surrounded by peach. However,
when traps were adjacent to a single, taller non-host pecan tree, capture was similar to mixed deciduous woods. These data
suggest that habitat structure supersedes presence/absence of host plants affecting vertical flight activity of male S. pictipes and S. exitiosa. |
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