Crop & Pest Report

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Northeast ND (07/06/17)

Information from the Northeast region of North Dakota.

Stripe rust was found in HRSW variety plots at the LREC station. My northeast scout has not observed stripe rust in fields outside of the station. Fungicides used for scab are effective against rust infection. Many acres have been or will be soon treated for scab in our region. Soybeans are starting to flower. Canola is a range of stages. Early seeded canola has pods forming on lower branches while later seeded canola is rosette to bolting. According to the NDSU Sclerotinia Risk Map, much our region is in moderate level of risk. Wheat midge is emerging. Pheromone traps in a locations known to be a hot spot or are wheat-on-wheat have large enough numbers to consider additional scouting and spraying if crop timing is right. Finally, thistle caterpillar defoliation is being found on soybeans and sunflowers. Maybe you noticed the large amount of migrated painted lady butterflies in early June? These caterpillars are the next generation. Soybean leaves have a shot-hole appearance and leaves are webbed together. We are not finding caterpillars at IPM thresholds of 20% defoliation for blooming soybeans or 25% defoliation for sunflowers. Observed caterpillars where nearing their last instar, which means caterpillars will soon stop feeding, pupate and emerge as painted lady butterflies.

Lesley Lubenow

Area Extension Specialist/Agronomy

NDSU Langdon Research Extension Center

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