Exploratory Tunnelling activity is dependant on two key factors:
- Sand particle size
- Moisture in soil
The rate of progress of a termite foraging through the soil is related to the soil type/size and the moisture content. From studies, the following tables show the effect over the distance covered.
The 250-355 micro range is quality top dressing soil," LIVING SOIL" (not washed sand). This is more important than using non-repellent chemicals and can be a great advantage with in-ground baiting systems.