Products
Biological control: Biopesticides: Preferal
Introduction
More info

PreFeRal® WG is a new biological insecticide that provides excellent control of the greenhouse whitefly in protected cultures of tomato, cucumber and ornamentals.
 

Action
More info
  • PreFeRal® WG contains spores of a naturally-occurring strain of the fungus Paecilomyces fumosoroseus. This fungus is highly efficient against the greenhouse whitefly and can infect all stages (egg, larva, pupa and adult) of this harmful insect.
  • The spores adhere to the different stages of the whitefly. After germination, the fungus penetrates the whitefly, which ultimately results in the death of the insect.
  • The fungus grows inside the host (internal proliferation). Under optimal conditions, the fungus forms mycelium and sporulates on the outside of the insect cadaver (external sporulation; visible as white-grey coloured mildew), releasing new spores. These spores will spread through the greenhouse and infect other whiteflies. The establishment of the fungus in the greenhouse will provide prolonged whitefly control.
  • Under suboptimal conditions, the mycelium will not become visible on the outside of the insect. The fungus will cause silent mortality which can be recognized as deformed insects which turn brown.
  • PreFeRal® WG will not immediately kill all insects, but gradually reduce the whitefly population for several weeks after application.
Application guidelines for optimal result
More info

Since PreFeRal® WG is a living biocontrol agent, its performance depends on having adequate conditions. Following these guidelines will help you to get the best results with PreFeRal WG.

  • Environmental conditions
    The most efficient whitefly control is obtained when the temperature in the greenhouse is between 20 and 28°C and when relative humidity remains above 80% for at least 12 hours per day. Applications on an actively evaporating culture will provide the best results due to a higher relative humidity on the leaf surface.
  • Spraying technique
    PreFeRal® WG is a contact insecticide, therefore it is advisable to provide a good coverage of the undersides of the leaves. A good spraying technique is required; a sufficient amount of water and a sufficiently high pressure are also crucial.
  • Insect pressure
    PreFeRal® WG is most efficient when application is initiated at the first sign of insect presence. Scout crops closely for whitefly presence and use yellow sticky cards to monitor them.
  • Timing of application
    The longer high humidity is maintained, the more effective the product can be. For optimal insect control, applications should be made in the late afternoon or early in the evening.
  • Compatibility with pesticides
    PreFeRal® WG may be affected by fungicides. Therefore, these must be used with great care. It is recommended to wait minimum 7 days between a PreFeRal® WG application and a fungicide treatment. Do not make tankmixes of PreFeRal® WG with fungicides.


 

Application
More info

The application method of PreFeRal® WG depends on the crop and the number of whiteflies present.

  • Spraying
    PreFeRal® WG should be applied with conventional spraying equipment. PreFeRal® WG works as a contact insecticide. In order to obtain an efficient insect control, the undersides of the leaves should be properly covered. It is recommendable to use sufficient quantities of water. The volume of water needed depends on crop development. Usually, selection of high spray volume will provide the best results. It is recommended to apply 2.000 - 3.000 l/ha on full-grown and 1.000 l/ha on small or young crops.
    The optimal pH of the water should be between pH 4 and pH 7.
  • Integrated Pest Management Programme
    PreFeRal® WG can be used in combination with beneficials such as Encarsia formosa, Eretmocerus eremicus or Macrolophus caliginosus. This makes PreFeRal® WG an outstanding correction agent when biological control needs some extra help with whitefly control. This is called "Integrated Pest Management" (IPM).
  • Integrated Resistence Management Programme
    PreFeRal® WG can be applied in combination with selective whitefly insecticides as a part of an Integrated Resistence Management Programme (IRM).

 

Application rates
More info

Put the required quantity of PreFeRal® WG in a bucket with tepid water (max. 20°C) and stir it from time to time for one hour into a thin paste. Then wait 15-30 minutes for the sediments to settle down and use only the top water column, which now will contain all the fungus spores. Mix this solution with the required amount of water in the spray tank. Do not put the tank in the direct sun or in a warm place.

Dose/Concentration:

  • Protected tomato cultures: 100g/100L water
  • Protected cucumber cultures: 100g/100L water
PreFeRal WG
More info

PreFeRal® WG is a water dispensible granule (WG), supplied per 500 g in a plastic reclosable container.
PreFeRal® WG contains 2 x 109 CFU/g (CFU = Colony Forming Units)

  • Active ingredient: Paecilomyces fumosoroseus strain Apopka 97: 20%
  • Inert ingredients: 80%
Storage and stability

PreFeRal® WG can be stored in a dry place, at 2-6°C for maximum 12 months if the product remains in its original and sealed container.

Disposal

Rinse the empty container thoroughly with water and add the rinsing water to the spraying solution in the tank. Empty containers should be destroyed and be disposed of with other household waste. Never use an empty packaging again for other purposes. To avoid residues after application, calculate the required spraying suspension volume accurately.


 

Important!
More info

Always read the entire label and instructions before use.
Make sure the product is authorized in your country and crop.

For controlling: Greenhouse whitefly
More info

The greenhouse whitefly (Trialeurodes vaporariorum) is a typical greenhouse pest that affects many crops.

Controllable in these crops:

The application method of PreFeRal® WG depends on the crop and the number of whiteflies present.

  • Spraying:
    PreFeRal® WG should be applied with conventional spraying equipment. PreFeRal® WG works as a contact insecticide. In order to obtain an efficient insect control, the undersides of the leaves should be properly covered. It is recommendable to use sufficient quantities of water. The volume of water needed depends on crop development. Usually, selection of high spray volume will provide the best results. It is recommended to apply 2.000 - 3.000 l/ha on full-grown and 1.000 l/ha on small or young crops.
    The optimal pH of the water should be between pH 4 and pH 7.
  • Integrated Pest Management Programme:
    PreFeRal® WG can be used in combination with beneficials such as Encarsia formosa, Eretmocerus californicus or Macrolophus caliginosus. This makes PreFeRal® WG an outstanding correction agent when biological control needs some extra help with whitefly control. This is called "Integrated Pest Management" (IPM).
  • Integrated Resistence Management Programme:
    PreFeRal® WG can be applied in combination with selective whitefly insecticides as a part of an Integrated Resistence Management Programme (IRM).

The application method of PreFeRal® WG depends on the crop and the number of whiteflies present.

  • Spraying
    PreFeRal® WG should be applied with conventional spraying equipment. PreFeRal® WG works as a contact insecticide. In order to obtain an efficient insect control, the undersides of the leaves should be properly covered. It is recommendable to use sufficient quantities of water. The volume of water needed depends on crop development. Usually, selection of high spray volume will provide the best results. It is recommended to apply 2.000 - 3.000 l/ha on full-grown and 1.000 l/ha on small or young crops.
    The optimal pH of the water should be between pH 4 and pH 7.
  • Integrated Pest Management Programme
    PreFeRal® WG can be used in combination with beneficials such as Encarsia formosa, Eretmocerus eremicus or Macrolophus caliginosus. This makes PreFeRal® WG an outstanding correction agent when biological control needs some extra help with whitefly control. This is called "Integrated Pest Management" (IPM).

 

The application method of PreFeRal® WG depends on the crop and the number of whiteflies present.

  • Spraying:
    PreFeRal® WG should be applied with conventional spraying equipment. PreFeRal® WG works as a contact insecticide. In order to obtain an efficient insect control, the undersides of the leaves should be properly covered. It is recommendable to use sufficient quantities of water. The volume of water needed depends on crop development. Usually, selection of high spray volume will provide the best results. It is recommended to apply 2.000 - 3.000 l/ha on full-grown and 1.000 l/ha on small or young crops.
    The optimal pH of the water should be between pH 4 and pH 7.
  • Integrated Pest Management Programme:
    PreFeRal® WG can be used in combination with beneficials such as Encarsia formosa, Eretmocerus californicus or Macrolophus caliginosus. This makes PreFeRal® WG an outstanding correction agent when biological control needs some extra help with whitefly control. This is called "Integrated Pest Management" (IPM).
  • Integrated Resistence Management Programme:
    PreFeRal® WG can be applied in combination with selective whitefly insecticides as a part of an Integrated Resistence Management Programme (IRM).

 

Technical sheet
Controllable pests:
Contact Biobest
Biobest Belgium N.V.
Ilse Velden 18
2260 Westerlo
BE - Belgium
T: +32 14 257 980
F: +32 14 257 982