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Adult Thrips tabaci.

Thrips Biological Control:

Two species of thrips are commonly found on protected crops: Western Flower Thrips (WFT), (Frankliniella occidentalis) and Onion or Tobacco Thrips (Thrips tabaci).

Larvae and adults pierce the leaf surface and suck out cell contents causing extensive 'silvering'.

WFT can also transmit Tomato Spotted Wilt Virus on chrysanthemums and many other crops. Other species of thrips are also being found, particularly on specimen plants. If in doubt send a sample to Fargro.

There is a pheromone for monitoring of Western Flower Thrips (see pheromone traps).

Amblyline cu (Amblyseius cucumeris / Neoseiulus cucumeris)

Amblyseius spp. (Photo: Holt Studios) Type: Predatory mite.

How it works: Feeds on young thrips larvae, and in the absence of thrips, on pollen.

Species controlled:

Most thrips species. Also Tarsonemid mite (good control on cyclamen and strawberry) and broad mite.

When to use:

Always use preventatively on peppers, cucumbers, pot and bedding plants, strawberries and cyclamen.

Rates of use:

Shaker bottle: 50 - 250 mites per m2. Controlled Release System (CRS) / Gemini sachet: 1 sachets per 1 - 2 m2 or one sachet per plant.
Fargro CodePack Size
FGTHD CRS with hooks, 200 sachets
FGTHS CRS no hooks, 500 sachets
FGTHO CRS Gemini sachets, 300 double sachets
FGTJSCRS mini sachets on stick, 500
FGTHC In bran/vermiculite, 50,000, 1 l tube
FGTHZ In bran/vermiculite, 250,000, 5 l bag
FGTHK Bran free, 50,000, 1 l tube
FGTHJ Bran free, 50,000, 5 l bag
FGTHH Bran free, 250,000, 5 l bag
FGTHT CRS formulation, 100,000, 5 l bag
FGTJB Bugline 6 x 80 m, 6 continuous sachets 1 in 6 filled
FGTJA Bugline 6 x 100 m, 6 strips continuous sachets 1 in 6 filled
FGTJC Bugline 6 x 140 m, 6 strips continuous sachets 1 in 6 filled
FGTJD Bugline 6 x 160 m, 6 strips continuous sachets 1 in 6 filled
Amblyline cu Packs

Oriline l and Oriline m (Orius laevigatus and O. majusculus)

Orius laevigatus feeding on a thrips larva (Photo: Holt Studios) Type: Predatory bugs.

How it works:

Voracious predator of thrips and other soft bodied insects such as aphids. They often kill far more thrips than they need to reach maturity.

Species controlled:

Orius will attack all stages of thrips on plants.

O. laevigatus performs well on the majority of crops, particularly those with pollen producing flowers. O. majusculus establishes better on cucumber.

When to use:

Ideal to control established thrips populations on a range of plants and can be used alongside other biologicals.

Rates of use: 0.5 to 1 per m2 every 2 weeks until established.
Fargro CodePack Size
Orius laevigatus
FGBUO Adult/nymph bottle, 500
FGBUN Adult/nymph bottle, 1000
FGBUP Nymphs, bottle, 2000
Orius majusculus
FGBUQ Adult/nymph bottle, 500
FGBUR Nymphs, bottle, 2000

Montyline am (Amblyseius (Typhlodromips) montdorensis)

Amblyseius montdorensis adults <br/>(Photo: Holt Studios) Type: Predatory mite.

How it works:

Predates but can survive in the absence of prey feeding on pollen.

Species controlled:

Predates on whitefly (eggs and larvae), as well as thrips. It will not control established populations or where large numbers of adults are moving into the crop. Consumes more thrips per day than the standard A. cucumeris and unlike A. cucumeris will predate on second instar thrips. Populations have the potential to grow faster than A. cucumeris.

When to use:

Introduce early into the crop cycle to protect. Requires minimum temperatures of 15C night and 20C day.

This predator is released under licence for use on a limited range of glasshouse grown crops, please contact Fargro for further details.
Fargro CodePack Size
FGMOB 1 l tube, 25,000
FGMOC 5 l bag, 125,000
FGMOA Mini sachets , x 1000
FGMOD Gemini sachets, x 500
FGMOE CRS no hooks, 500 sachets
FGMOF Bugline 6 x 100 m, 6 strips continuous sachets 1 in 6 filled
FGMOG Bugline 6 x 160 m, 6 strips continuous sachets 1 in 6 filled
Montyline am Packs

Exhibitline sf (Steinernema feltiae)

Type: Microscopic nematodes.

How it works:

A special formulation for foliar application by high volume spraying. The nematodes swim through a film of water and attack female thrips.

Species controlled:

Adult female Western Flower Thrips. Larvae are not always attacked but pupae frequently are. Also controls leafminer.

When to use:

At any time of the year, ideal at temperatures above 16C. Do not use under strong lights or when the sprayed crop is likely to dry within 3 to 4 hours. A series of 4 or 5 weekly sprays is best to control a thrips population. Nemasys can be used alongside Conserve and several other pesticides for a wider range of activity.

Rates of use (for foliar application):
Preventative: 50 million per 400 m2 or 250 million per 2000 m2.
Standard control: 50 million per 200 m2 or 250 million per 1000 m2.
Fargro CodePack Size
EXYFH50 million
EXSFL5 x 50 million
EXYFL50 million
EXYFK5 x 250 million

See Also:

View our full range of biological controls