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ISSUE 12  July 20, 2000


South-Central ND

    Total rainfall as recorded at NDAWN sites in south-central ND during July 11 to 17 ranged
from 0.8 inch at Harvey to 2.5 inches at Streeter. The additional rain is hampering late-season
fieldwork and generally lowering crop conditions. On July 17, estimated daily water use of wheat
emerged May 1 was 0.13 to 0.17 inches; for corn emerged May 15 daily water use was 0.20 to
0.24 inches; and soybean emerged May 29 and sunflower emerged June 5, daily water use
ranged from 0.12 to 0.27 inches.

    Cool-season crop condition has deteriorated due to generally excessive soil moisture, lodging,
and disease. During the week of July 16, winter cereal and barley swathing began in areas south
of I-94. Scattered winter wheat fields have been harvested. Flowering is complete with fall- and
early spring-seeded canola and some swathing will occur the last week of July. Warm-season
crops continue to rapidly develop.

    Leaf spot disease (tan spot, leaf rust, and Septoria in wheat; spot and net blotch in barley) severity
is rapidly increasing. The NDSU foliar disease forecasting model for the Carrington site indicated
potential for tan spot and leaf rust infection during all but 2 to 3 days for the period of July 6 to 17.
Scab is easily detected in early-planted wheat and is likely to have high incidence in wheat planted
in early- to mid-May.

    Accumulated degree days (DD) for orange wheat blossom midge as of July 17 at Harvey was 1779
units. All other NDAWN sites in the region had accumulated over 1800 units, which signals the end
of midge emergence. Black light trap counts for European corn borer at Carrington continue to indicate
low moth counts.

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


Southwestern ND

    Moisture is short in some areas and adequate in other areas of the southwest. Precipitation as
reported by the NDAWN stations south and west of the Missouri River indicate that precipitation
amounts received during the week of July 11 through 18 varied from a third of an inch at Watford
City to 1.37 inches at Mandan. Both Hettinger and Dickinson reported over an inch of rain.
Temperatures of 90oF + over a four day time period was reported over a large area of the southwest.
Bowman and Hettinger hit 98oF on July 14. Producers in the far southwest part of the state have begun
swathing winter wheat and will soon begin swathing early seeded barley. Scab has been found in some
fields west of Dickinson and more extensively in Mercer, Oliver, Morton, Grant, and Sioux Counties.
Where it has been found west of Dickinson less than 2% of the plants are showing infection. In the
counties listed earlier, some fields appear to have up to 30% of the plants showing infection. Rust,
tan spot, and septoria infection rates and severity have increased, especially after this last rain. Orange
Wheat Blossom Midge was found in one field in Morton County.
    High temperatures have reduced or terminated flowering in late seeded canola. During the evening
tour at Beulah on July 18, Bertha armyworm larva was found on canola. Sunflower stem weevils have
been found in sunflower fields with a few fields being sprayed for this pest. Some corn is beginning to
tassel and silk. Safflower is beginning to flower while most flax fields in the area have completed
flowering. Early seeded pea fields are maturing and turning color.

Roger Ashley
Area Extension Specialist/Cropping Systems
Dickinson Research Extension Center
Dickinson, ND


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