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Cereal Aphid Update (05/19/16)

In addition to last week’s detection of cereal aphids in SE area of North Dakota, low densities of cereal aphids were detected in Minot in NC area.

Cereal Aphid Update

In addition to last week’s detection of cereal aphids in SE area of North Dakota, low densities of cereal aphids were detected in Minot in NC area (T. Prochaska, NCREC), and Williston in NW area (A. Kalil, WREC). The bodies of aphids are pear-shaped and small about ⅛ inch long. The greenbug, English grain aphid and bird cherry oat aphids are the principal species that cause problems in North Dakota small grains. Greenbug is pale green with darker stripe down back. Bird Cherry Oat Aphid is olive green, brownish patch at the base of cornicles. English Grain Aphid is bright green with long black cornicles. All three species can vector Barley Yellow Dwarf Virus (BYDV), especially when aphid populations are high. Continue scouting and look closely at the base of plant as well as the underside of leaves for cereal aphids. The economic threshold is 85% incidence with one or more aphids present on plant, prior to the completion of heading.

Janet J. Knodel

Extension Entomologist

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