NDSU Crop and Pest Report


ISSUE 4  May 22, 2003

North-Central ND

DIAMONDBACK MOTHS Mature larvae of the diamondback moth have been found feeding on alternative weed hosts like tansy mustard. I believe the diamondback moth overwintered in North Dakota this year. In addition, the migrant diamondback moths are arriving now from the southern states. Trappers need to get their pheromone traps out soon, so we can predict whether diamondback moth will be a high risk for the canola crop this year.

GRASSHOPPERS Another hatch on first instar grasshoppers (about the size of a wheat kernel) has been observed in emergence traps in winter wheat fields at Minot.

WIREWORMS Wireworms are active now with the moist warm soil temperatures (50-55 degree F), and will continue to be active until soil temperature warms to >80 degrees F. In heavily infested soil, wireworms are easy to find digging around in the soil.

CUTWORMS No reports to date.

ALFALFA WEEVIL No reports to date.

Janet J. Knodel
Area Extension Specialist Crop Protection
North Central Research and Extension Center
Minot, ND

South-Central ND

During the past week (May 14 to 20), area rainfall ranged from 0.5 inches at Wishek to 2.0 to 2.1 inches at Carrington and Pillsbury as recorded at NDAWN (North Dakota Agricultural Weather Network) sites. Topsoil and subsoil moisture is adequate across the region with low areas holding water. Sunshine and warm weather is needed.

Wheat and barley planting is essentially complete except in Wells and Sheridan counties. Corn planting generally has stopped due to the date, except for corn grown for silage. When soil conditions allow planting to resume, soybean, dry bean and sunflower will be the priority crops. Frost ranging from 27 to 32 degrees occurred on May 20 that caused some foliage damage to alfalfa and probably inconsequential damage to other crops except possibly emerged soybean. Herbicide application for weed control in small grain is in progress. Leaf spot disease in wheat is sporadically occurring. Small grain stands and yield potential is currently excellent.

Greg Endres
Area Extension Specialist/Cropping Systems
NDSU Carrington Research Extension Center

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