It is generally recommended that the pheromone tabs be changed every two weeks. However, in cases of extremely high temperatures, pheromone tabs may need to be replaced every 7 to 10 days. Other factors affecting pheromone trap effectiveness are moonlight and barometric pressure. Increased male moth activity rhythms can often be related to full moon periods, and this should be considered when predicting expected population peaks during the growing season. Conversely, reductions in trap captures have been associated with abrupt changes in barometric pressure.
Male moths are inactive during the passage of a low pressure storm front.
The moths can often be found hiding low to the ground in and around host crops. Also, nights with little or no breeze may be associated with low trap catches, probably because the pheromone is not dispersed from the area of the trap. Back To Top Determining Trap Placement Trap location is extremely important and the following should be considered when placing traps. The host plants available for TBW to a great extent are only cotton except for wild hosts. If a CBW trap is placed close to a corn field the trap will typically catch many more moths than one placed in proximity to cotton and soybeans, as corn is the preferred host.