Crop & Pest Report

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Northeast ND (07/27/17)

Information from the Northeast region of North Dakota.

Soybean aphids are being found across the northeast region. Numbers vary from a few aphids per plant up to the IPM threshold. Remember to refrain from spraying until aphids reach the IPM decision threshold of 250 aphids per plant in 80% of the field with aphids increasing. Soybeans are susceptible to soybean aphid injury through the R5 stage. Spraying aphids too early has several negative consequences: having to double your insect control cost by requiring a second spray, killing the natural aphid predators in the field that may be keeping aphids below the thershold, and promoting the risk of aphids developing pyrethroid insecticide resistance. Pyrethroid resistance has been found in Polk and Norman Counties in MN, so if you have ND fields where soybean aphids appear to be surviving after a pyrethroid application, Extension is interested in tracking this. Reach out to us.

Spring wheat is at the milk stages to soft dough. Grain aphids still present in wheat. While your field looks concerning, do not spray as we are past the recommended IPM threshold at heading crop stage. Pea aphids have been found at IPM threshold levels on early pod field peas in Cavalier County. On the disease side, scab has been found in wheat plots at the LREC station. We haven’t seen white mold infection develop in canola yet on station. Dry bean growers should scout for rust.

 

Lesley Lubenow

Area Extension Specialist/Agronomy

NDSU Langdon Research Extension Center

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