This period holds the most productive window of the varroa battle and at the same time the peak of robbing. Both threats are governed by the beekeeper's decisions.
Varroa: The Brood-Break Opportunity
In this period the queen's laying slows or halts. As brood decreases, varroa cannot find a place to hide and turns phoretic — that is, it rides on the bee. This is the golden window for treatment: all the mites are accessible.
The other face of the same coin is dangerous: little brood + the same mite count = a multiplying mite density in the cells. If untreated, the first generation of winter bees to be produced is hit directly.
Measurement Is Essential
- Powdered sugar or alcohol wash: mites dropped in 300 bees are counted.
- Intervention threshold: 3% (3 mites per 100 bees). If above the threshold in this period, treatment is not postponed.
- Bottom board: alarm if the daily natural drop exceeds 8-10.
- Measurement is done in 10-20% of the apiary, in randomly chosen hives.
Treatment and Temperature
The most critical technical detail of this period is temperature. In organic-acid-based applications, high temperature increases both effect and risk — a treatment applied in extreme heat can harm the queen and open brood. The temperature range on the product's label must be strictly observed, and application done in the cool of the day.
No chemical is applied to a hive whose honey has not been harvested. The order of harvest and treatment must not be confused.
Robbing: The Signature of the Period
In a dearth, where the bee cannot find nectar it looks in another hive. In this period robbing is not the exception but the default behaviour.
Signs: scuffling at the entrance, torn bees on the ground, foreign bees searching for an entry on the hive walls, bees "checked" as they hover at the landing board, wax crumbs in front of the hive.
Prevention: reduce the entrance (in a weak colony to a single bee's width), leave no honey/comb exposed in the apiary, keep inspections short, remove empty volume, feed all colonies at the same time.
If it has started: reduce the entrance completely, place a wet sheet or a diverter in front of the hive, and if necessary move the colony temporarily elsewhere. Robbing does not stop of its own accord.
Hornets and Wasps
Hornet colonies are at their own peak in this period and are seeking protein for their larvae. The bee is prey to them. Hornets that ambush at the landing board wear down a strong colony and finish a weak one.
The single most effective measure is again entrance reduction — the front to be defended shrinks. Traps are supplementary; finding and destroying the main nest is the permanent solution but is often not possible.
Wax Moth
Heat drives the wax moth's reproduction rate to its peak. Every comb not protected in the hive — empty supers, the edge combs of a weak colony, combs in storage — is finished within weeks. A weak colony dies of moth in this period; but the real cause is weakness, the moth merely completes the outcome.