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P-IE

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Category: Poster

Poster: P-IE, Biocontrol

Beneficial insects in sustainably grown blackberries using conservation biological control and two OMRI approved insecticides

Poster

  • Conservation biological control (CBC) manages habitat by planting native perennial flowering plants and grasses to provide food and habitat for predatory and parasitic arthropods near crops. Spotted-wing Drosophila (SWD), Drosophila suzukii, is a pest of soft-skinned fruit including blackberries. Biologically based insecticides, Grandevo (Marrone Bio Innovations, Davis, CA) and Entrust (Dow AgroSciences, Indianapolis, IN) are approved by the Organic Materials Review Institute and can be used in conjunction with CBC in an integrated approach. The objective of this research was to identify and quantify beneficial insects in blackberries bordered by native perennial plants or pasture and treated with Grandevo or Entrust. In addition blackberry damage was quantified. Native perennial borders were planted with 14 species of flowering plants and 5 grasses. Pasture borders were a mixture of grasses, clover, and broad leaf weeds. Insecticides were sprayed every other week for three weeks after SWD detection. Sticky traps were placed in border rows and in the center of the five insecticide treatments in the blackberry rows in 2019. Traps were changed every other week. Traps were taken to the laboratory for insect identification and quantification and blackberries were examined for SWD larvae. Minute pirate bugs (MPB; Orius ) were the most abundant insects found. Other predatory insects found were pink lady beetle, Asian lady beetle, spotless lady beetle, 7 spotted lady beetle, big-eyed bug, mildew eating lady beetle, orange spotted lady beetle, green lacewing, and brown lacewing.