Which of the following is not a mode of action for termiticides?

The rationale for why the option related to "Gaza receptor blockers" is not a mode of action for termiticides lies in the terminology used. The correct term is "GABA receptor blockers," which refers to a specific mode of action involving the inhibition of gamma-aminobutyric acid (GABA) receptors in pests. GABA is a neurotransmitter that plays a crucial role in regulating neuronal excitability across the nervous system. Blockers of these receptors can disrupt normal nervous system function in insects, leading to paralysis and death.

In contrast, "Gaza receptor blockers" appears to be a typographical or conceptual error, as it does not correspond to any recognized biological or chemical action within the context of pest control. The other options provided—neurotoxin inhibitors and chitin synthesis inhibitors—represent established modes of action for termiticides. Neurotoxin inhibitors disrupt the functioning of the insect nervous system, while chitin synthesis inhibitors interfere with the formation of chitin, a vital component of the insect exoskeleton, effectively preventing them from growing or maintaining structural integrity.