1. This month's priorities

• Gradually expand the brood nest without chilling the colony.
• Add the first super only when the colony and the nectar flow justify it.
• Watch very early for signs of congestion and swarming impulse.
• Introduce and monitor the drone frame if this measure is part of the varroa strategy.
• Prepare the equipment, record interventions, and keep an eye on stores, water, and the weather.

2. April in the apiary: the guiding idea of the month

Objective Understand why April is above all a month of balance: the colony is accelerating, but the beekeeper must still support this growth without rushing it.

In April, the colony enters a phase of rapid expansion. Laying increases, the brood area spreads, and the worker population changes quickly as pollen intake becomes more regular.

This dynamic, however, depends less on the calendar than on the actual context: temperature, flowering, exposure, and altitude strongly affect colony rhythm. In lowland areas, April may already open up genuine management decisions; in mountain areas, conditions may still be close to a biological March.

The guiding theme of the month is therefore clear: provide space at the right moment, without chilling the brood nest or letting the colony become congested.

Further reading

• Good practices for inspecting a colony
• The goat willow, a spring boon

3. Priority tasks for the month

3.1 Expanding the brood nest volume without disturbing it

Objective Adjust the available space to the actual strength of the colony, in order to support growth without fragmenting or chilling the brood.

What to watch
Actual frame occupation, bee density in the brood box, brood extent, and space still available for laying. The brood nest remains a thermal core: any change in its volume affects its balance.

Concrete actions
Expand gradually. Introducing a frame to build or foundation can support expansion when a colony is actively building, without disrupting the internal organisation. The decision must remain tied to the weather, colony strength, and actual nectar intake.

Points of vigilance
Too restricted a volume promotes congestion and the storage of nectar in the laying area. Conversely, expanding too quickly increases thermal losses and can slow development. Stimulative feeding can sometimes temporarily support the dynamic, but it cannot durably replace a good floral context.

Further reading

• Brood nest volume
• Frame construction
• Principles of bee feeding

3.2 Adding the first super at the right time

Objective Provide a buffer volume for nectar storage before the brood box becomes blocked, without adding too early a space that the colony cannot yet manage.

What to watch
Colony strength, dense occupation of the brood box, extent of brood, foraging intensity, and the reality of the nectar flow. Phenological markers can help: depending on the location, dandelion flowering often signals that one should be ready, but it does not suffice as a sole rule.

Concrete actions
Add the first super when the brood box is genuinely well occupied and when storage dynamics begin to weigh on the space available for the queen. The decision must remain practical and local, not tied to a fixed date.

Points of vigilance
Adding a super too early can slow development by increasing the volume to heat. Adding it too late promotes congestion of the brood nest and increases the risk of swarming.

Further reading

• Practical Guide: 4.12 Dynamic colony management
• Dandelion
• Inspections: points of attention

3.3 Anticipating the swarming impulse and distributing the dynamic

Objective Identify early signs of swarming and intervene while a management measure can still change the colony's trajectory.

What to watch
Bee density, brood box congestion, the appearance of queen cell cups or queen cells, the abundance of capped brood, and the relative slowing of laying. In April, the dynamic may still be subtle, but it can establish itself quickly in very strong colonies.

Concrete actions
Correct structural causes first: lack of space, brood nest blockage, excessive demographic pressure. In very strong colonies, skimming off bees or the measured transfer of a capped brood frame to a weaker colony or a nucleus colony can help distribute the dynamic, provided a rigorous sanitary assessment is carried out.

Points of vigilance
Removing queen cells without changing internal conditions is generally insufficient. Any brood transfer must be considered carefully to avoid moving varroa or other sanitary problems from one colony to another.

Further reading

• Preventing swarming
• Understanding swarming
• Practical Guide: 1.4.7 Increase from swarming impulse

3.4 Preparing queen rearing and nucleus colonies according to context

Objective Prepare the queen rearing or multiplication season when colonies, drones, and the weather genuinely begin to allow it.

What to watch
Colony strength, brood quality, pollen availability, the presence of sufficiently developed drones, and the stability of weather conditions. In April, not all apiaries are at the same stage.

Concrete actions
Prepare the equipment, select the colonies to monitor closely, and plan operations rather than trying to launch intensive rearing everywhere too early. Where the context already lends itself to it, April may allow the first setups; elsewhere, it remains above all a preparation month.

Points of vigilance
Success depends on genuine biological synchronisation. Colonies still at the margin, a lack of mature drones, or overly unstable weather quickly reduce the quality of results.

Further reading

• Principles and methods of queen rearing
• Rearing F1 queens
• Drone rearing

4. Bee health

Objective Slow the varroa dynamic early through a simple biotechnical measure integrated into spring management.

The best prevention is strong, healthy colonies
It is not necessary to know every disease. The essential thing is to be able to recognise a healthy colony and then identify what deviates from it. When in doubt, it is better to ask for help quickly and contact the bee inspector.
Useful practical guide: 4.7.3. Recognising healthy colonies

Varroa

What to watch
The presence of drone brood, the colony's building capacity, and the possible regularity of inspections. In spring, the parasite already takes full advantage of capped brood, particularly drone brood.

Concrete actions
Introduce a drone frame when the colony is actively building, then intervene when the drone brood is entirely capped, before emergence. This measure helps slow the spring rise of the parasite population.

Points of vigilance
Effectiveness depends strongly on timing and regularity. A late intervention loses much of its value. This measure does not replace subsequent treatments or the overall sanitary strategy of the apiary.

Chalkbrood
In spring, this problem can reappear during cold and damp episodes or in weakened colonies. One mainly observes chalkbrood mummies, irregular brood, and sometimes a more marked impact on peripheral frames.
Practical guide: 2.4. Chalkbrood

Bee poisoning
In spring, acute poisonings are among the risks to keep in mind, particularly near crops or cover crops in flower. Trembling, confused bees that are unable to fly, or mass mortalities on the alighting boards call for a rapid response.
Practical guide: 3.1.2. Bee poisoning

American foulbrood and European foulbrood
With brood present, remain equally attentive to American foulbrood and European foulbrood. Patchy brood, abnormal larvae, sunken or perforated cappings, an unusual odour, or a suspicious ropiness test must not be downplayed.
Practical guide: 2.1. American foulbrood / 2.2. European foulbrood

Asian hornet
In April, the Asian hornet generally remains little visible at the apiary, but primary nests may already appear in well-sheltered places. Discreet attention is enough at this stage: the main task is to learn to recognise the species and to report any suspected case quickly. When in doubt, document the observation and report it on frelonasiatique.ch.

 

Further reading

• Drone frame
• Practical Guide: 1.4.1 Drone brood removal
• Integrated varroa control through the seasons

5. Stores and resources of the moment

Objective Support colony growth without overestimating the resources actually available in spring.

In April, the colony's needs rise sharply. Pollen determines brood rearing, but the quality of available resources depends on the actual floral context and the effective possibility of flying. A few days of cold, rain, or wind can abruptly slow intake.

Colony status must therefore be reread in light of the weather, the stores still present, and access to water. Stimulative feeding may sometimes be used as a supporting measure, but it remains contextual and transitional.

Further reading

• Pollen consumption and colony development
• Water collection and storage
• Practical Guide: 3.2 Dearth periods

6. In the workshop / organisation

Objective Keep the apiary organised at a time when the frequency and diversity of interventions are increasing.

April requires preparation: supers ready, frames available, equipment for possible nucleus colonies, and clear colony monitoring. It is also a good time to keep the hive record carefully and to note useful observations after the first spring interventions.

Further reading

• Apiary management: beekeeping management plan
• Ten tips for a good hive inspection
• Good practices for inspecting a colony

7. What we don't do now

Objective Avoid timing mistakes that strongly disturb colonies at the start of their major expansion.

• Do not brutally expand a colony that is still just barely strong enough: too much space chills the brood nest.
• Do not add the first super according to a fixed date: it is the actual colony that decides.
• Do not simply destroy queen cells without correcting congestion or lack of space: the effect is often temporary.
• Do not transfer brood from one colony to another without sanitary consideration: one also risks moving problems.
• Do not launch queen rearing everywhere on a mere calendar impulse: colonies, drones, and suitable weather are needed first.

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