What system is likely to provide colony suppression in termites?

The most effective option for providing colony suppression in termites is biotermicides. These are natural or environmentally friendly agents that target and disrupt the biological processes in termites. When biotermicides are applied, they can significantly reduce the population of termites by affecting their health and ability to reproduce, thereby suppressing the colony.

The use of biotermicides can lead to targeted treatment of termite infestations without the negative impact associated with some chemical pesticides. By disrupting the termite's biological cycles and natural behaviors, biotermicides can effectively diminish colony size and sustainability over time.

In contrast, the other methods may not lead to colony suppression. Physical barriers prevent termites from entering a structure but do not address an existing infestation. Insect Growth Regulators can disrupt development but often require a more strategic application and may not lead to immediate colony reduction. Baiting with sugar attracts termites but does not effectively lead to colony suppression since it may only serve as a food source without impacting colony dynamics. Thus, biotermicides stands out as a viable option for long-term colony suppression.