Cultivos
 
Strawberry Cultivos
  Pests in strawberry
 
General
Spider mite
Thrips
Whitefly
Aphid
Caterpillars
Mites
Black vine weevil
General remarks on the biological control in strawberries
 
Before using the advised selective chemicals, check if they are registered for this crop in your country.
It is advantageous to introduce beneficials in a "clean" greenhouse, free of pests.
Take into account that for most beneficials it is only possible to do their work properly at a temperature over 18°C.
Dusting pesticides affects beneficials adversely.
Yellow and/or blue sticky traps can be used preventively for the detection of flying insects.

Warning:

Please contact your technical advisor if in doubt about the side effects of chemical pesticides or consult our side effect list.
Predatory mites used for the biological control of spider mites and thrips need a high relative humidity (at least 65%).

 
Biological control of spider mites
 
(two-spotted spider mite - Tetranychus urticae)

  Feltiella-System (gall midge - Feltiella acarisuga)
 
Gall midges have an excellent ability to search the red spider mites.
Introduce locally 1 pot (250 pupae) during 4-6 weeks (at least 0,15 pcs/m²).
We advise to use also Amblyseius californicus and Phytoseiulus persimilis.
  Amblyseius californicus-System (predatory mite - Amblyseius californicus)
 
Can be used preventively against red spider mites (starting from the first flowers).
Introduce preventively 4 Amblyseius californicus/m².
Amblyseius californicus can hibernate in frost-free greenhouses.
  Phytoseiulus-System (predatory mite - Phytoseiulus persimilis)
 

Corrections:

Biological control of thrips
 
(western flower thrips - Frankliniella occidentalis)
(onion thrips - Thrips tabaci)

  Hang up yellow and/or blue sticky traps for detection of the thrips.
  Amblyseius-Breeding-System (A.B.S.) (predatory mite Amblyseius cucumeris in breeder bags)
 
When no water is sprinkled above the plants.
Introduce at least 5.000 bags/ha (minimum 1.000 Amblyseius/bag); 1 million A. cucumeris/ha in total.
Start with the introduction of Amblyseius cucumeris at the latest when there are enough flowers (thus earlier introduction is possible).
Repeat after 6-8 weeks after having consulted your adviser.
  Amblyseius-System (predatory mite - Amblyseius cucumeris)
 

Direct sprinkling onto the plants:

  • If no breeder bags are used, Amblyseius cucumeris can be introduced as sprinkling material. Apply only when there are enough flowers.
  • Introduce at least 2 x 500 000 Amblyseius/ha on the plants, with an interval of 1 tot 2 weeks.

Sprinkling on the pot/bag:

  • If no breeder bags are used, Amblyseius cucumeris can also be introduced as sprinkling material on the pot. Apply only when there are enough flowers.
  • Introduce at least 1.000.000 Amblyseius cucumeris/ha.
  Orius-System (predatory bug - Orius spp.)
 
Introduce Orius starting from the beginning of the flowering period. Introduce at least 2 x 0,5 Orius/m² on the plants, with an interval of 1 to 2 weeks (1 Orius/m² in total).
In case of severe attack: introduce at least 5 to 10 Orius/m² in "hot spots" of thrips.
Biological control of whitefly
 
(greenhouse whitefly - Trialeurodes vaporariorum)
(sweet potato whitefly - Bemisia tabaci)
  Hang up yellow sticky traps for detection of whiteflies
  Encarsia-System (parasitic wasp - Encarsia formosa)
 
After detection of the first whiteflies: introduce 2 Encarsia/m² per week for at least 4 weeks until a sufficient number of whiteflies are parasitized (at least 80%).
Biological control of aphids
  Hang up yellow sticky traps for detection of the first aphids.
  Aphidius-System (parasitic wasp Aphidius colemani)
 
Introduce preventively at least 0,1 Aphidius colemani/m² per week starting from the first flower.
After detection of the first aphids: introduce at least 0,5-1 Aphidius colemani/m² per week until a balance is reached.
  Aphidoletes-System (gall midge - Aphidoletes aphidimyza)
 

Introduce 1-2 Aphidoletes/m² per week when aphid colonies are observed:
  Harmonia-System (larvae of Harmonia axyridis)
 
Supplementary to Aphidius colemani and Aphidoletes aphidimyza.
In and around "hot spots": at least 10-20 pieces/m².
  Adalia-System (larvae of Adalia bipunctata)
 
Supplementary to Aphidius colemani and Aphidoletes aphidimyza.
In and around "hot spots": at least 10-20 pieces/m².
  Ervi-System (parasitic wasp - Aphidius ervi)
 
Introduce Aphidius ervi when glasshouse potato aphid (Aulacorthum solani) or potato aphids (Macrosiphum euphorbiae) are observed (in and around "hot spots" of aphids: 2 pcs/m²).

Corrections:

Biological control of caterpillars
 

Pheromone traps
 
Hang up pheromone traps: at least 2 traps per species per ha.
At intervals of at least 50 mp to avoid mixing pheromones.
Replace the pheromone capsules every 6 weeks.
Biological control of broad mites and cyclamen mites
  Amblyseius-Breeding-System (A.B.S.) (predatory mite - Amblyseius cucumeris)
 

Start when there is sufficient regrowth after planting:

  • Sprinkling onto the plants: at least 1 million A. cucumeris/ha.
  • Sprinkling on the pot/bag: A. cucumeris can also be used as sprinkling material on the pot. Introduce at least 1 million A. cucumeris/ha.
Biological control of black vine weevil
  Heterorhabditis-System (insect parasitic nematodes - Heterorhabditis megidis)
 

Black vine weevils cause a lot of damage to roots and foliage.

Container crops: 0,5 million nematodes/m².
Open field crops: 1 million nematodes/m².
Warning: the soil should be moist for 14 days and the temperature should exceed 12°C.
 

 

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