FROM AROUND THE STATE
ISSUE 7 June 15, 2000
Crucifer Flea Beetle Activity Decreasing in Canola.
Flea beetle activity peaked this last week. The population cycle is
at the end of its spring activity
and with the cool, rainy, weather it definitely decreased this week .
New Pest Observations
Grasshoppers are starting to hatch from their egg masses. The cool, wet weather will cause mortality
with the small nymphs, and delay further hatching.
Small Grain Diseases
Low severity levels (<10%) of leaf diseases (tan spot, and septoria) were observed during Small Grains
IPM Survey last week. Most leaf diseases had a high incidence level thou. Counties surveyed include:
Bottineau, McKenzie, McLean, Mountrail, Renville, Rolette, and Ward. Prolonged wet growing seasons
favor the rapid build-up of leaf diseases. With extended periods of rain, mist, or fog (24 hours or greater),
small grains need to be watched for development of severe leaf diseases.
Janet J. Knodel
Area Extension Specialist Crop Protection
General rains of 1 to 4 plus inches fell across north central and north western North Dakota this past
Crop conditions are good for most crops. The row crops could use
some warmer weather. Sunflowers
seeded in mid May are growing very slow. Corn seeded in April is only six to ten inches tall. Early seeded
small grains range from jointing to flag leaf. Early seeded canola is bolting to early flower. Dormant seeded
canola fields are in their second week of bloom and conditions have been excellent for an extended bloom.
Winter wheat is beginning to head with excellent yield potential. Spikelets counts of 14 to 17 spikes per
head are common in fields in north central North Dakota.
The main concerns now are catching up with herbicide spraying and disease development in small grains.
Area Extension Agronomist
North Central Research/Extension Center Minot
Total rainfall as recorded at NDAWN sites in south-central ND during
June 7 to 13 ranged from
0.12 at Streeter to 5.05 inches at McHenry. A dry season has turned very wet in Foster and especially
Eddy Counties. Areas south of I-94 received about an inch or less during the past week. On June 11,
estimated daily water use of wheat emerged May 1 was 0.2 to 0.3 inches and for corn emerged
May 15 the estimated water use was 0.1-0.15 inches. Planting of all crop acreage is essentially complete,
except for scattered sunflower acres. Winter wheat and spring-seeded crops continue to be in generally
good- to excellent-condition. Winter wheat is in the flowering stage or beyond and spring wheat is jointing
or more advanced. Early spring-seeded canola began flowering the week of June 4.
Alfalfa and other hay harvest continues. Alfalfa weevils are
commonly found in counties south of I-94.
Post-emergence herbicide application continues in corn, flax, and beans and is starting in sunflower.
Generally, low levels of tan spot are present but severity should increase with recent rains. Trace levels
of leaf rust and low levels of BYDV continue to be found. The NDSU foliar disease forecasting model
for the Carrington site indicated likely tan spot and leaf rust infection June 11-13. Currently, low levels
of grain aphids can be found in the region. Wheat growers are contemplating fungicide application for
leaf spot control and foliar N application for protein enhancement.
Area Extension Specialist/Cropping Systems
Carrington Research and Extension Center
Rainfall is the big story this week. A minimum of two inches was
received through out the region
with a maximum of nearly 20 inches in areas of Grand Forks county. Most of the area received 3-4
inches of rainfall the last week. Flooding has occurred along with damaging hail in many areas.
Small grain spraying is 75 % complete with much crop yet to be
sprayed in Towner and Rolette
counties. Weed spraying in canola in nearly complete while much flax remains to be sprayed. Crop
disease concerns will increase as crop matures and recent rainfall promotes disease development.
Winter wheat is heading, wheat is 2 leaf to jointing with 50% of the
crop in the 3-4 leaf stage,
barley is 4 leaf to jointing, corn 4 leaf , flax from 3 inches to 8 inches tall, sunflower and dry beans
are emerging. Canola is beginning to bolt. Sclerotinia will be a concern if wet weather continues.
Crop production potential is very good.
Area Extension Specialist/Cropping
Rainfall for the week of June 7 through June 14 in counties south
and west of the Missouri River
as recorded by the North Dakota Weather Network sites ranged from 0.25 inches at Beach to
2.56 inches at Mandan. Other reports from county agents and producers indicate that up to 4 inches
was received from the latest storm. Crops in areas of southeast Bowman County and in scattered
areas in Grant County were damaged by hail.
Winter wheat and much of the frost seeded hard red
spring wheat has headed. Spring wheat that
was seeded in early April is beginning to head while late seeded wheat has progressed to the third
and fourth leaf stage. Much of the crop has advanced to jointing to flag leaf stage of development.
We continue to find fields that are infected with wheat streak mosaic as well as barley yellow dwarf
virus. Winter wheat fields that were found to be severely infected with WSMV have been destroyed.
Net blotch has been found in barley fields in Hettinger and Adams Counties. Reports received to date
indicate that grasshopper populations are generally low but some "hot spots" have been reported to
have been treated. Aphids have been found in fields but populations have not approached economic
thresholds to date though producers should be scouting fields on a regular basis. Also we have been
finding aphid predators such as lacewings and ladybugs. These insects will help reduce aphid populations.
Early seeded canola and mustard crops are blooming and have been
reported to be in good to
excellent condition. Diamondback moths are being trapped in pheromone traps in southwest
North Dakota. Last week flea beetle populations were the highest that we have recorded in this area
for the season but since the crop is as advanced as it is, pesticide treatment is not required. Flax has
been reported to be about six inches tall to 20% bloom. Safflower is elongating while sunflower is
emerging to four leaves. Sunflower beetles have been found in limited numbers in the few fields that
we have scouted but infestation levels are relatively low.
Corn crop development was slow until the recent warm weather.
Freezing weather received earlier
this season injured some of the early-planted corn (also injured other crops) but for the most part the
crop has recovered and is progressing well.
Differences in plant development are being noted at the Seed
Treatment Demonstration on the
August and Perry Kirschmann Farm near Regent. The Hettinger Crop Improvement Association has
scheduled a tour for Monday, July 10. One of the tours stops will be at these plots to provide
producers an opportunity to evaluate seed treatment performance first hand. For further information
about this tour please contact Dwain Barondeau, Hettinger County Agent at (701) 824-2095.
Area Extension Specialist/Cropping Systems