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ERIOPHYID MITES IN RELATION TO KENTUCKY BLUEGRASS SEED PRODUCTION

Two mite species, Abacarus hystrix (Nalepa) and Aculodes mckenziei (Kiefer) (Acarina: Eriophyidae) are reported from Kentucky bluegrass, Poa pratensis L., in Minnesota. Abundance of these mites was monitored in Kentucky bluegrass seed fields where postharvest residue was either clipped or burned. Adult and immature mites were significantly (P < 0.05) more numerous in biweekly samples taken from clipped plots in comparison to burned plots. Plant biomass and seed yield were significantly (P < 0.05) greater in burned plots. In a laboratory experiment, plant height and weight of Kentucky bluegrass were significantly (P < 0.05) lower in replicates artificially infested with mites when compared with uninfested replicates. The evidence suggested that these mite species reduced seed yield and inhibited plant growth.