Understanding ecological role of a predatory mite (Balaustium sp., Acari: Erythraeidae) in northern California

Feeding habits, occurrence, and behavior of a potentially new species of mite (Balaustium sp., Acari: Erythraeidae) found in Northern California (USA) almond and walnut orchards were observed to develop a greater understanding of its ecological role in agriculture.  Balaustium sp. are known for their predacious behavior, often feeding on soft bodied arthropods (Putman, 1970) including Panonychus ulmi (Koch), Aphis pomi De Geer, Tetranychus urticae and Aspidiotus perniciosus Comstock (Childers & Rock, 1981). In addition to field observations, samples of Balaustium sp. were collected for feeding and rearing trials. Routine observations were conducted at two almond and two walnut orchards within Butte County, CA (USA) starting 25 April 2012. Findings regarding occurrence, feeding habits and behavior of Balaustium sp. are discussed.