University of California-Riverside entomology professor Thomas Miller holds a preserved glassy-winged sharpshooter in this 2004 file photo. Contra Costa County is trying to prevent an infestation of this insect from spreading after it was found present on plants sold by a number of Costco stores over the past month.

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University of California-Riverside entomology professor Thomas Miller holds a preserved glassy-winged sharpshooter in this 2004 file photo. Contra Costa County is trying to prevent an infestation of this insect from spreading after it was found present on plants sold by a number of Costco stores over the past month.…