The bait was placed at ground level about 20 cm from the downwind side of the traps.
Ten plants were randomly selected from each field and cut at ground level.
Unfortunately the shallow primary ground level of the structure had disappeared, and a clear-cut phase attribution is still uncertain.
The other emission sources were assumed to produce the same emissions as the powerhouse generator (discharged at about 6 m above ground level).
The access cover for the terrace tank was rusted, improperly secured and sunken below ground level, allowing surface run-off water to enter the tank.
The wooden stakes were pushed into the ground so that the aluminium sheets were approximately 30 cm above ground level.
The trees were managed by pruning at 30 cm above ground level during the cropping season to minimize shading and competition for light and water.
This result could be biased as there were beetles at different heights of the canopy that was beyond chemical spraying from the ground level.
