[Roland]

There is a possibility, although slim, that insecticides that effect the nerve firing effect the use of Sodium and Potassium.

From an AI search:

Neonicotinoids disrupt potassium usage by blocking the function of nicotinic acetylcholine receptors (nAChRs), which initially stimulates and then blocks the flow of potassium and sodium ions through these channels
. This action is central to their toxicity in insects but can also affect non-target species, including mammals and fish.

Cesium MAY be used by the cell in place of Potassium, being two elements directly below.????.

Psycho Roland