How To Use Apivar Strips For Effective Varroa Mite Management
Apivar strips utilize the active ingredient amitraz, a formamidine acaricide, to control Varroa destructor infestations within honey bee colonies. To achieve maximum efficacy and prevent the development of acaricide resistance, beekeepers must install the strips in the brood nest for a continuous 42-day duration during periods of low honey flow, ensuring the active compound is spread through colony contact.
Pre-Application Requirements and Hive Preparation
Successful chemical treatment begins with accurate diagnostic monitoring rather than prophylactic use. Before opening the hive, confirm the mite population exceeds the economic injury threshold—typically a 3% infestation rate as determined by an alcohol wash or powdered sugar roll. Applying Apivar when infestation levels are low or when honey supers are present creates unnecessary chemical exposure and potential contamination risks.
- Essential Equipment: A standard hive tool, a pair of nitrile gloves, and a notebook for recording batch numbers and installation dates.
- Mandatory Standards: Ensure the strips are removed after exactly 42 to 56 days. Leaving strips in the hive longer than 56 days exposes the colony to sub-lethal doses of amitraz, which is the primary driver of resistance in Varroa mite populations.
- Timing Benchmarks: Treatment must occur outside of the primary honey flow period. If you are producing surplus honey for human consumption, all honey supers must be removed before installation.
- Environmental Thresholds: Ambient temperatures should ideally be between 10 degrees Celsius and 35 degrees Celsius. Extreme cold or extreme heat can alter bee behavior and movement, reducing the efficiency of the contact-based distribution of the active ingredient.
Precise Installation Protocol for Maximum Efficacy
The delivery mechanism of Apivar relies entirely on the contact between worker bees and the plastic strip. Amitraz is lipophilic and is distributed throughout the hive via the natural grooming and movement behaviors of the bees. If the strips are placed in areas with low traffic, the mites will not be exposed to a lethal dose.
Step 1: Hive Inspection and Brood Nest Assessment
Prior to inserting the strips, perform a quick inspection to assess the current configuration of the brood nest. You need to identify the frames containing the most bee activity, specifically those where young bees are actively tending to brood. Avoid placing strips in the very outer edges of the hive body where worker bee traffic is minimal.
Step 2: Strip Placement within the Brood Cluster
The ideal placement for Apivar strips is directly within the brood nest. For a standard ten-frame Langstroth hive, use two strips for an average-sized colony. If the colony is extremely weak or small, you may reduce the dosage, but never exceed the maximum of two strips per ten-frame brood chamber.
Pro-Tip: Place the strips between frames 3 and 4 and frames 7 and 8. This ensures the strips are positioned in the center of the bee cluster, maximizing the probability of contact as bees move across the surfaces.
Step 3: Securing the Strips
Bend the pre-cut tabs at the top of the strip to hang them vertically between the frames. Ensure the strips are not bunched up or touching the sides of the hive walls. They must hang freely so that bees can walk on both sides of the plastic.
Warning: Do not overlap strips or place them in direct contact with foundation or burr comb that would obstruct bee movement. If the bees propolize the strip, the release rate of the amitraz will be compromised.
Step 4: Monitoring and Documentation
Once installed, do not disturb the colony for the first 14 days. After this period, you may perform visual checks to ensure the cluster has not shifted away from the strips. Record the installation date immediately in your apiary logbook. If you fail to remove the strips at the 42-day mark, the risk of selecting for resistant mite populations increases exponentially.
Apivar Varroa Treatment 4 Strips - Ritchie Feed & Seed Inc.
Technical Parameters and Chemical Specifications
The efficacy of Apivar is contingent upon its specific material properties and the chemical release rate designed for honey bee colony dynamics. Unlike organic acids which provide a "knock-down" effect, Apivar provides a sustained release profile.
| Parameter | Specification/Metric |
|---|---|
| Active Ingredient | Amitraz (500 mg per strip) |
| Treatment Duration | 42 to 56 Days |
| Dosage Rate | 2 strips per 10-frame deep brood chamber |
| Mode of Action | Formamidine acaricide (Nervous system disruption) |
| Storage Conditions | Cool, dry place; keep sealed in original packaging |
| Shelf Life | 24 months from manufacturing date |
Troubleshooting Common Application Failures
Even with proper placement, environmental factors or biological variables can lead to subpar treatment results. Understanding the root cause of these failures allows for rapid corrective action.
- Failure: High mite counts post-treatment.
- Root Cause: Insufficient bee-to-strip contact. This often occurs when strips are placed on the periphery of the hive rather than in the active brood cluster.
- Actionable Fix: Reposition strips into the heart of the brood nest. If the colony is too small to cover the strips, consolidate the hive into a single deep box or use a nucleus box setup.
- Failure: Persistent mite infestation after full treatment.
- Root Cause: Acaricide resistance or improper chemical storage. Amitraz efficacy can degrade if strips were exposed to sunlight or extreme heat prior to use.
- Actionable Fix: Rotate to a different mode of action, such as oxalic acid or formic acid, for the next treatment cycle to break the resistance cycle.
- Failure: Bee mortality immediately following insertion.
- Root Cause: Extreme hive temperature or incorrect dosage for a small nucleus colony.
- Actionable Fix: If using a nucleus colony, reduce the number of strips to one. Ensure the hive is well-ventilated if temperatures are exceeding 35 degrees Celsius.
Frequently Asked Questions
Can I leave Apivar strips in the hive for longer than 56 days?
No. Leaving strips in the hive beyond the 56-day limit does not provide additional control and actively promotes the development of amitraz-resistant Varroa mites. Always remove the strips promptly to preserve the effectiveness of the product for future seasons.
Is it safe to leave Apivar strips in the hive while honey supers are on?
No. You must remove all honey supers intended for human consumption before installing Apivar. The chemical residues can contaminate the honey, and the presence of supers can draw bees away from the brood nest, rendering the treatment ineffective.
Do I need to treat all hives in the apiary at the same time?
It is highly recommended to treat all colonies in your apiary simultaneously. Mites frequently move between hives via drifting bees, so treating only a portion of your hives can lead to rapid re-infestation of the treated colonies from untreated neighbors.
Does the external temperature affect how I use Apivar strips?
Yes, ambient temperature influences the cluster density of the bees. In very cold weather, the bees may cluster tightly and avoid the areas where the strips are located, while in extreme heat, the release rate of the chemical may fluctuate. Aim for stable, moderate temperatures to ensure consistent delivery.
Optimize Your Apiary Health
Proactive monitoring and the correct application of Apivar strips are the cornerstones of a sustainable mite control strategy. Contact your local beekeeping association to coordinate regional treatment schedules and ensure your hives remain healthy year-round.
