Spidend Predatory Gall Midge

Scientific name: Feltiella acarisuga.

Feltiella acarisuga is a gall midge species that predates on various species of spider mites. Gall gnats become established with high spider mite density colonies and high humidity. As the larvae are incapable of moving considerable distances, a substantial population of prey must be present before the adults lay eggs, and the Cecidiomyiidae are most frequently seen during pest outbreaks. 

Adult gall midges actively search for spider mite colonies and deposit their eggs next to the spider mites. The larvae that hatch feed on spider mite eggs and suck them empty. Spider mites that are killed by the gall midge shrivel up and become brown or black.

Feltiella acarisuga is effective to manage spider mite populations in a variety of greenhouse and field crops such as tomato, pepper, cucumber, strawberries and various ornamental crops.

Other preys of gall midges include aphids, followed by scale insects, then other small prey such as whiteflies and thrips.

*Attention, some species of the Cecidomyiidae family fly larvae feed within plant tissue, creating abnormal plant growths called galls. 

Use for:

• For the organic biological control of all species of spider mites.
• Especially for hotspot treatment.
• Can be used in soil and hydroponic medium plantations.
• Use in combination with Phytoseiulus persimilis predatory mites.

Mode of action:

After emerging from the pupa, adult gall midges actively search for spider mite colonies and deposit eggs next to the spider mites. Once emerged, the larvae feed on the spider mites.

Visually, spider mites are consumed entirely, only skin remains.

Product specifications:

Application:

• Make a hole in the lid and place the cup on the rock wool slab or directly on the soil.
• Protect against direct sunlight and water.
• Leave the cup in place for at least two weeks.

Dosage:

The dosage of Spidend depends on climate, crop and spider mite density and should always be adjusted to the particular situation. Start introduction as soon as the first spider mites are detected in the crop. Introduction rates typically range from 0.25 to 25 gall midges per m²/release. Releases should be repeated at least 3 times at weekly intervals, or until the pest is controlled.

Environmental conditions:

Optimal results are achieved in a humid environment of >80% relative humidity and at temperatures between 20°C and 27°C / 68°F and 81°F.

Storage:

• Apply as soon as possible after receipt. If necessary, the product can be stored for 1 to 2 days.
• Store at temperatures of 12°C to 14°C / 54°F to 57°F.
• Store in the dark.

Caution:

• Pesticides can have direct or indirect effects on biological solutions.
• Only use products that are permitted in your country or state and crop.