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Northeast ND (07/04/19)

Information from the Northeast region of North Dakota.

The early seeded wheat has reach fungicide timing in the region. For susceptible wheat varieties, scab risk is high in parts of Towner, Rolette, Ramsey, and Nelson Counties. Wheat midge are starting to emerge as of early this week. We also have found cereal leaf beetle damage in wheat, but it is extremely low and spotty in wheat. The injury looks like a long skinny strip of leaf with just the plant cuticle left, like a picture window pane. The spray threshold is 1 larva or more feeding on the flag leaf and the fields were nowhere near that threshold.

Canola is starting to bloom in the region. Sclerotinina risk is high across the northeast region. Blister beetles have been observed in faba beans, alfalfa and feeding on garden potato blossoms.  In alfalfa, look at field margins for blister beetle. Use a labeled insecticide for alfalfa, such as Sevin, and wait the harvest interval before cutting alfalfa. If you cut alfalfa without a crimper, the beetles will move on as they prefer to eat live alfalfa blossoms.

Thistle caterpillar have been found defoliating soybeans. The spray action threshold is high at 50% defoliation of plants in non-flowering plants and 40% defoliation at early flowering. Natural predators will find these caterpillars to reduce populations, as well. With profit margins tight in soybeans (and soybean aphids in North Dakota), I would adhere to this recommendation and save your money to when you will need an insecticide.

Finally, you may see ichneumon wasps around your home or trees. These insects have what looks like an alarming stinger. But their stinger is used to parasitize wood-boring larva in trees. They will cause no harm to you and kill pests inside your trees.

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Lesley Lubenow

Area Extension Specialist/Agronomy

NDSU Langdon Research Extension Center

This site is supported in part by the Crop Protection and Pest Management Program [grant no. 2017-70006-27144/accession 1013592] from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed are those of the website author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.

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