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Grass thrips (Anaphothrips obscurus) are a widespread pest of both annual and perennial grass crops. These yellow-colored insects are slightly less than one- twentieth of an inch long as adults. Grass thrips (GT) can be found living in perennial grass fields all year long and are able to withstand temperatures far below freezing unharmed.

GT are all females and reproduce asexually, giving them a high rate of reproduction. If a genetic mutation occurs in a GT that provides resistance to an insecticide’s mode of action, it can rapidly become predominant in a population.