|Authors: ||D.T. Johnson, C.R. Roubos, T.W. Nyoike, L.L. Stelinski, O.E. Liburd|
|Keywords: ||Vitis spp., pest management, Vitacea polistiformis|
The grape root borer, Vitacea polistiformis, is a root pest of wine grapes and muscadine vines (Vitis spp.) that reduces yield over time and kills vines.
Management tactics include soil mounding, laying landscape cloth under vines or applying a soil barrier of insecticide (chlorpyrifos). The Isonet-Z dispenser (Shin-Etsu Chemical Co.
Tokyo, Japan) is a new sex pheromone blend of the leopard moth, Zeuzera pyrina (Lepidoptera: Cossidae) of 95% (E,Z)-2,13-octadecadien-1-ol-acetate (called E,Z-2,13-ODDA): 5% (E,Z)-3,13-octadecadien-1-ol-acetate (called E,Z-3,13-ODDA). Isonet-Z has the same major component as the grape root borer sex pheromone, a 99:1 blend of (E,Z)-2,13-ODDA and Z,Z-3,13-ODDA. This study compared attractiveness to grape root borer of two lures: Isonet-Z rope dispensers and grape root borer sex pheromone rubber septa lures.
It also compared three densities of Isonet-Z dispensers per hectare to disrupt mating of grape root borer, and determined if grape root borer sex pheromone-baited green bucket traps at a density of 2.5 traps per ha would mass trap grape root borer.
Traps baited with grape root borer sex pheromone lures captured significantly more grape root borer males than traps baited with an Isonet-Z dispenser of leopard moth pheromone.
In Florida and Missouri, zero grape root borer moths were caught in grape root borer pheromone-baited traps set in muscadine or wine grape plantings with mating disruption treatments of 127, 370, 494 or 741 Isonet-Z dispensers per ha.
In Missouri, more grape root borer moths were captured in wine grape plots with mass trapping at a density of 2.5 grape root borer pheromone-baited traps per ha than plots with mating disruption or untreated controls, and after two years mass trapping only 15% of vines were infested with larvae compared with 71% that had old root tunneling.
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