Product guide 

Genaral information

How does it work?

Amblyseius barkeri is a predatory mite that feeds on a wide range of small arthropod prey. It was identified as a potential candidate for control of thrips on Capsicum crops by Ramakers, but was superseded in commercial production by N. cucumeris. There has recently been a renewed interest in this species for control of bulb mites and Tarsonemid mites.

It works by seeking out and feeding on small prey items, and because of its small size it is able to reach into inaccessible areas of the plant, such as the growing point or between bulb scales, where Tarsonemid mites live and cause damage.

When and where should you use it?

Use the predator on any crops where Tarsonemid mites are a problem.

Recommended release rates are:

• Heavily damaged plants - remove
• Visibly damaged plants - 500 – 1000 mites/m²
• Plants in a band for 2-3 metres around the infested area – 100 – 500/m²
• Rest of crop – 50 – 100 mites/m²

Lower rates or preventive introductions may be suitable on pollen rich crops where the Amblyseius barkeri will be able to establish.

When should you not use it, and what are the control alternatives?

Amblyseius barkeri will not control large populations of Tarsonemid mites that are already well established, nor reduce existing leaf damage. If used correctly, it may slow or stop the further development of damage on lightly infested plants, and slow or prevent the spread of the infestation to neighbouring plants.

Other biological control agents suitable for control of Tarsonemid mites are Amblyseius cucumeris and Amblyseius californicus, although the former is the most commonly used. Registered acaricides such as abamectin may be used to reduce populations initially. In bright conditions, residues of this acaricide on the leaf surface decline rapidly, and predators may be introduced a few days after application.

What will it do?

Amblyseius barkeri will help to prevent Tarsonemid damage to crops when applied preventively. It may also help to limit damage to flower bulbs.

What won’t it do?

Amblyseius barkeri will not control large existing Tarsonemid populations, nor remove damage that already exists, so always use the product as early as possible to prevent damage occurring.

Chemical compatibility.

Consult your advisor.

How to use Amblyline bar (Amblyseius barkeri)

• Sprinkle the loose product onto the foliage of plants in areas of high pest infestation
• Release at lower rates in surrounding areas, where damage may not be visible
• In the case of severe infestations, remove the worst affected plants and treat surrounding plants with high rates of Amblyseius barkeri
  

 
Recommended release rates are:

• Heavily damaged plants - remove
• Visibly damaged plants - 500 – 1000 mites/m²
• Plants in a band for 2-3 metres around the infested area – 100 – 500/m²
• Rest of crop – 50 – 100 mites/m²

Storage

• Use within 18 hours of receipt
• Store between 10-15°C
• Keep out of direct sunlight