Proven Hive Performance Suggests Auckland’s Climate and Crop Conditions Are the Key Limiters

By Kim Martin, Zonda Bees

Every year, Zonda receives calls from growers saying “the bees aren’t working” and requesting new hives. While hives are sometimes replaced, these cases consistently show that the bumblebees are performing as expected. The real challenge? Humidity, Auckland weather, and plant conditions.

Auckland’s Challenging Conditions This Season

This season, the upper North Island has experienced high storms and moisture, which disrupts bee activity. Bumblebees require warm, stable, sunny conditions to forage effectively inside glasshouses. Unfavourable conditions can lead to:

• Lower activity levels
• Shorter foraging windows
• Bees leaving the glasshouse entirely

Classic Pollination Issues

• Bumblebees may exit through vents and not return if there’s better forage outside.
• Venting strategies, especially in humid Auckland conditions, can exacerbate the problem.

Tomato pollination relies on very specific conditions:

• Too hot → pollen becomes non-viable
• Too humid → pollen doesn’t release properly
• Poor airflow → reduced bee movement

Even though bumblebees excel at “buzz pollination,” they still need optimal microclimate conditions:

• Flowers not setting in sequence (classic poor pollination sign)
• Later flowers setting better than early ones (missed visits)

Key insight: Bees may appear inactive, but often plant physiology or climate is the trigger.

How Crop Conditions Affect Bees

• Poor pollen quality → bees reduce activity or abandon the crop
• Weak or overly vegetative plants → reduced pollination success

Climate inside the greenhouse can stop pollination entirely, even with active bees:

• High heat (>30°C) → pollen sterilization
• High humidity → pollen won’t release
• Low humidity → pollen won’t stick

This leads to a frustrating scenario:

Bees are visiting, but fruit still doesn’t set → looks like bee failure

Why Auckland Is More Challenging

• 🌧 Higher humidity → pollen issues + more venting
• 🌿 More competing forage outside glasshouses
• 🌡 Warmer nights → pollen viability problems
• 🐝 Higher hive turnover pressure in year-round growing

Supplier Specs for Optimal Pollination:

• Target temperature ≈ 21°C

• 30–34°C → pollen viability drops

• Low humidity → stigma dries out
• High humidity → pollen won’t release

Hive Performance Factors

• Bees must maintain body temp (~30°C+) to fly
• Cold or damp hives → more bees heating brood instead of foraging
• Condensation → fewer active bees

Auckland’s humid climate naturally limits hive performance. Most hives arrive 8–10 weeks old and peak before gradually declining. Pollination drops as hives age.

Strategies for Growers

Hive management:

• Replace hives weekly or fortnightly during peak flowering
• Double hive numbers temporarily to maintain pressure

Climate control:

• Open hives early morning (low venting), restrict later to reduce bee loss
• Target tighter temperature bands (low 20s °C)
• Actively manage humidity
• Focus on early-day pollination — this is the most effective window

Key takeaway: Pollination failure is often a climate problem disguised as a bee problem.

Last year, Zonda supplied over 5,000 hives, with issues confined to Auckland — not the bees, but the environmental conditions.

For more information contact Kim Martin E: kim@nzg.co.nz