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June 17, 2004 Sugarbeet Root Maggot: Peak Fly Activity Expected June 18-28 Moderate numbers of sugarbeet root maggot flies were observed on sticky stakes in old beet fields on June 15, according to Mark Boetel, North Dakota State University Extension entomologist. “Fly movement into new beet fields will continue to progress slowly and will be spread over a longer period than normal due to the cool weather of the past two weeks and the expectation of more of the same for the next several days.” Peak fly activity in current-year beet fields should occur between June 18 and 28, depending on location. “Be advised that fly emergence and movement into beet fields can be accelerated quickly following a major increase in air temperatures,” Boetel says. Growers in high maggot-risk areas (central and southern Pembina County and extreme north central Walsh County) should consider applying a postemergence insecticide. Granular insecticides should work well for postemergence because soils are somewhat moist, and longer residual insecticide activity may be needed because of the delayed buildup of fly activity. Granular products should be applied immediately. “It is better to err on the early side of peak activity with granules,” Boetel says. “The prolonged emergence period will pose a challenge for producers to effectively time their liquid insecticide applications this year. Liquids should be applied at least three days before the expected peak to get good results because a lot of fly activity will probably occur for up to five days before peaking.” For more information regarding postemergence control of the sugarbeet root maggot and for more specific product recommendations, refer to the Insect Control section of the “2004 Sugarbeet Production Guide” or the Sugarbeet Insects section of the “2004 Field Crop Insect Management Recommendations.” These publications are online at: http://www.sbreb.org/Production/production.htm and http://www.ext.nodak.edu/extpubs/plantsci/pests/e1143w1.htm. ### Source:
Mark Boetel, (701) 231-7901, mboetel@ndsuext.nodak.edu
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