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Feltiella acarisuga | Biological control of spider mites
Written by Kevin van Kester | Last update: 25. January 2023
The gall midge Feltiella acarisuga (also known as therodiplosis persicae) is a powerful biological spider mite control solution for fighting several spider mites. Adult midges are highly effective at locating spider mites from long distances, while the larvae can devour large amounts of mites and eggs—up to five times more than Phytoseiulus mites.
Identifying Feltiella acarisuga
The eggs of Feltiella acarisuga are pale yellow and hard to spot, but can typically be found in spider mite hotspots. The larvae, about 2.5 mm in size, start as transparent with an orange tint, later turning red, brown, or grey as they mature. They pupate directly on the leaves, and the adult gall midge, with its long slender body and legs, plays a crucial role in detecting and controlling spider mites over long distances.
Biological control of spider mites with Feltiella acarisuga
The adult gall midges use their strong detection skills to locate spider mite colonies, where they deposit their eggs. As the larvae hatch, they attack the spider mites by injecting a paralyzing toxin. This toxin not only immobilizes the mite but also liquefies its internal contents, which the larvae consume. Known for their aggressive feeding behaviour, these larvae can effectively reduce spider mite populations, making Feltiella acarisuga a powerful tool for biological control of spider mites in greenhouses.
Optimal conditions for Feltiella acarisuga
Feltiella acarisuga is most effective in an environment with high humidity and temperatures above 15°C. Despite this, the gall midge can still perform well in drier conditions, continuing to target and control spider mites even when humidity is lower than ideal. This resilience makes Feltiella acarisuga a versatile option for control of spider mites in a range of Canadian greenhouse environments.
Applying Feltiella acarisuga for spider mite control
Feltiella acarisuga has to be applied directly to spider mite hotspots. To use, simply remove the lid and place the container in a shaded area close to the infestation, making sure it’s far from irrigation to avoid water accumulation. You can use one container per outbreak or spread the contents across multiple locations. To ensure effectiveness, repeat the process weekly for four weeks, or until pupae are visible under the leaves. (Development time is 22-25 days at 22°C). For best results, combine Feltiella acarisuga with Phytoseiulus persimilis (PHYTOcontrol).
Guidelines for storing Feltiella acarisuga
To achieve the best results, the product should be used directly. Upon receiving Feltiella acarisuga, inspect the product for any irregularities and report issues within 24 hours. If immediate use isn't possible, store it in a cool, dark place at 8-10°C, but no longer than 24 hours to maintain its effectiveness.