LABORATORY RELEASE RATE STUDIES OF SHIN-ETSU, FRESHLY MANUFACTURED VERSUS COLD-STORED, FRESH PHEROMONE ROPES

The release rates of freshly manufactured and cold-stored, fresh Shin- Etsu diamondback moth pheromone ropes were studied. These rates were i dentical at 50 degrees C with 100 ml/min air flow for 360+ hours. Grav imetric analyses at the end of exposure showed <1 mg of formulation in the well of the rope with 19.6 and 9.4% of the theoretical amount pre sent in the total rope for lots 69025 and 41104, respectively. Gas chr omatographic (GC) analyses showed 0.2% Z-11-hexadecenal and 0.3% Z-11- hexadecen-1-ol acetate reside entirely in the wall of the ropes for ea ch lot and none in the wens. The release rates of freshly manufactured and cold-scored, fresh Shin-Etsu diamondback moth/cabbage looper pher omone ropes were also studied. These rates were nearly identical at 50 degrees C and 100 ml/min air flow for 360+ hours. Gravimetric analyse s at the end of exposure showed <3 mg of formulation in the well of th e rope with 20.0 and 20.3% of the theoretical amount present in the to tal rope for lots 69024 and 5Y044, respectively. GC analyses showed <0 .1 mg of any pheromone component in the well of either lot and overall 0.1% Z-7-dodecen-1-ol acetate, 2.6% Z-11-hexadecenal, and 7.0% Z-11-h exadecen-1-ol acetate of the theoretical amount in the total rope for 69025 and 0.1% Z-7-dodecen-1-ol acetate, 1.1% Z-11-hexadecenal, and 3. 5% Z-11-hexadecen-1-ol acetate of the theoretical amount in the total rope for 5Y044. Cold-storage of Shin-Etsu pheromone ropes for extended periods up to several years does not seem to be detrimental to the re lease of pheromonal components versus release from freshly manufacture d ropes. Release rates of pheromonal components seem to be the same un der laboratory conditions for freshly manufactured versus cold-stored, fresh ropes.