Diffusion of Grandlure Volatiles
lacking about ambient concentrations of boll weevil pheromone produced in
infested cotton fields and of grandlure dispensed from pheromone trap baits.
Results of this study will contribute to universal improvements in the
placement and density of pheromone traps and other monitoring and management
physical characteristics of plumes of volatile insect attractants for
varying microclimatic conditions
A point source
of grandlure will be continuously emitted at high concentrations using a
compressed-gas nebulizer. Vacuum air pumps with adsorbent columns and solid
phase microextraction fibers (SPME) will be placed at fixed ranges downwind
of the point source of grandlure to collect diurnal ambient air samples.
Volatile compounds will be eluted from the columns and SPME fibers and
analyzed by ion mobility spectrometer (IMS) or gas chromatograph (GC) to
determine the constituent concentrations. Detailed microclimatic
measurements will identify the influence of air temperature, temperature
lapse rate, relative humidity, wind direction, wind speed, and turbulence on
the diffusion of plumes of volatile compounds. This field research will be
conducted in a level pasture at the Southern Plains Agricultural Research
Center and in cotton in the Brazos Valley.
was used in 2000 to identify chemical constituents of volatile insect
attractants including grandlure in a laboratory environment.
John K. Westbrook