Feltiella

Rübsaamen, 1910

Feltiella is a of predatory gall midges (Cecidomyiidae) whose larvae feed on spider mites (Tetranychidae). The genus includes commercially important agents, particularly F. acarisuga, which is mass-reared for augmentative biocontrol of tetranychid mites in greenhouse and agricultural systems. Larvae are voracious of spider mite , with documented consumption rates exceeding 150 eggs per larva. are short-lived and do not feed on prey.

Pronunciation

How to pronounce Feltiella: /fɛlˈtiːɛllə/

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Habitat

Agricultural systems, greenhouses, and natural vegetation supporting spider mite . plants include Urtica dioica, Lactuca scariola, Rubus , and various cultivated crops such as cucumber and eggplant.

Distribution

; recorded from Europe (Denmark, Norway, Sweden, Slovenia), Asia (Iran, Japan), and commercially distributed globally for .

Diet

Spider mites (Tetranychidae); larvae are obligate . Documented prey includes Tetranychus cinnabarinus, Tetranychus urticae, and other tetranychid mites. Larvae preferentially consume over other life stages.

Life Cycle

Complete : , three larval instars, pupa, . Development is temperature-dependent; at 25°C, larval development completes in approximately 4 days and total development in 11–12 days. Lower developmental threshold estimated at 8.2°C; thermal constant 200 . Optimal temperature range for development and survival is 24.5–28.7°C. Adult longevity is brief: females 4–5 days, males 3–4 days at 25°C.

Behavior

Larvae are active, mobile . rate increases with instar: first instar consumes ~6 /day, second instar ~16 eggs/day, third instar ~30 eggs/day. Total larval predation averages ~152 eggs. do not prey on mites.

Ecological Role

of spider mites; significant natural enemy in agricultural and greenhouse . Serves as for including Aphanogmus feltiellophagus (Ceraphronidae), which may reduce biocontrol efficacy. Engages in intraguild and competition with other acariphagous predators such as Phytoseiulus persimilis.

Human Relevance

Commercially mass-produced and sold as agent for of spider mites in protected and field crops. Used in augmentative biocontrol programs worldwide.

Similar Taxa

Phytoseiulus persimilisBoth are acarivorous of Tetranychus urticae used in ; Feltiella is a dipteran larval predator while Phytoseiulus is a predatory mite. Feltiella larvae are more mobile and consume more per individual, but have shorter times and different thermal requirements.
Feltiella luboviaeCongeneric with similar ; both are predatory gall midges feeding on spider mites. F. acarisuga has broader commercial use and distribution, while F. luboviae has been studied in specific contexts of intraguild interactions with other .