2. Treatment Arc Behaviour (Formic Pro)

Why I Track the Treatment Arc

When I treat for varroa, the hive doesn’t just change chemically — it changes acoustically, behaviourally, and metabolically. I’ve learned that listening to the hive gives me a gentler, earlier understanding of how they’re coping.

This arc is my record of what I heard and saw from 30 April to 3 May, using long‑duration recordings, spectrograms, and field observations.

1. Early Treatment — 30 April, 09:12–09:40

When I placed the pads, the hive immediately quietened. I could hear the metabolic suppression begin almost at once.

My spectrograms showed:

uniform quieting across 100–450 Hz
a weak midband
faint upper midband
no collapse void
no deep sag

“Uniform suppression across 100–450 Hz… No collapse void… No deep sag.”

This wasn’t collapse — just the hive deliberately reducing energy output.

By 09:40, I could already hear them adjusting.

2. Mid Treatment — 11:10–12:10

A couple of hours later, the hive began to adapt rather than react.

I noticed:

a more stable fundamental
sag staying shallow
midband starting to hold together
upper midband faint but present

“This is the first moment where the midband begins to look ‘held together’ rather than ghost‑thin.”

This is the phase I think of as adjusted suppression — low energy, but organised.

3. Late Treatment — 15:08–22:09

This is where I first heard recovery.

Across afternoon → evening → night, the hive sounded warmer and more coordinated:

fundamental strengthened
sag lifted
midband thickened
upper midband returned
harmonics re‑emerged

“Fundamental is strongest and most stable of the day… Midband is dense and continuous… Tone is warm, steady, and night‑coordinated.”

Night recordings always tell me the truth — and this night showed unmistakable recovery.

4. Early Recovery — 1 May, 07:06

The next morning, the hive sounded different the moment I opened the recording.

I heard:

a stronger fundamental
sag noticeably shallower
midband continuous
upper midband stable
harmonics returning

“This is the first true recovery signature after treatment.”

And the behaviour matched perfectly:

“Entrance calm and organised… Early pollen return… No agitation.”

This is when I knew they were truly coming back.

5. Mid Recovery — 1 May, 12:30–16:19

By early afternoon, the hive sounded recognisably healthy again.

My recordings showed:

very stable fundamental
minimal sag
dense, continuous midband
structured upper midband
harmonics rebuilding

“This is the strongest midband so far in the entire treatment arc… Tone is warm, confident, and coordinated.”

This is the moment where I always breathe out — the hive has regained internal order.

6. Late Recovery — 3 May, 07:51

This was the strongest, cleanest acoustic signature of the entire arc.

I heard:

a confident, stable fundamental
sag almost gone
fully rebuilt midband
structured upper midband
stable harmonics

“This is the closest to a healthy baseline you have seen since before the April collapse arc.”

Behaviour confirmed it:

“The fundamental tone is strong, stable, and unbroken… Harmonics are clean… No agitation.”

This is the point where the hive is truly back.

What My Treatment Arc Shows

My hive moved through a clear, gentle progression:

Suppression → Adjustment → Early Recovery → Full Recovery

Listening made the entire arc visible long before behaviour alone could have shown it.