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ISSUE 4  MAY 27, 1999


North-Central ND


    Flea beetles are rapidly emerging with the warm, sunny weather. Sticky trap catches have
increased from last week. Some growers are experiencing economic levels of flea beetle damage
in fields planted early (late April to early May) and with Gaucho-treated seed.
This is due to the cool,
rainy weather, which prevented the seed from germinating in the usual 7 days. The seed sat in the ground for 2-3
weeks and is finally emerging through crusted and other difficult soil conditions. Unfortunately, gaucho has little
efficacy against flea beetles after 21 days. So, field monitoring is very important especially on these early
planted fields treated with gaucho or non-treated
. Fields planted last week are already emerging and catching
up to the earlier planted fields which quit growing during the cool, rainy period. The Economic Threshold (E.T.)
for flea beetle on canola is 25% foliar damage (pitting) during the seedling stage. Remember, scout several areas
of the field. If fields are above E.T., a foliar treatment of Warrior is recommended. The insecticide trial at Minot
will provide interesting data on different seed and foliar treatments this year!



    The North Central Region is getting close to the end of the high risk planting window (200-600 DD,
Base 40"F)) when the wheat development is synchronized with the wheat midge emergence. The following
Degree Day (DD) accumulations to May 24th are listed for Northwest ND: Rolla = 395, Columbus = 397,
Mohall = 482, Bottineau = 459, Towner = 493, Turtle Lake = 504, Minot = 540, and Williston = 554 (Source:
ND Ag Weather Network). Due to the late season, most wheat will be planted after the 600 DD mark and be
at lower risk for midge infestation!



    The first adult sunflower beetles were observed at the North Central Research Extension Center in
Minot. Reports have also been received from the Carrington area as well. The adult sunflower beetle
overwinters in last year’s sunflower fields, and feeds on the volunteer sunflowers until the newly planted
sunflower plants emerge.



    Early instars of the two-stripped grasshopper and other species can be found in ditches and fields now.
There are very tiny about the size of a wheat kernel!

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


South-Central ND

    Sunshine, warm temperatures, and minimal rainfall were present in south-central North Dakota this past
week. The ND Ag Weather Network weather stations in this region recorded no rain at Dazey to 0.21 inches
at Bismarck during May 19 to 25. Most counties continue to have excessive soil moisture in low-lying areas.

    Winter grain, alfalfa and pastures generally are in good condition. Planting operations have resumed during
the last 5 to 10 days. Small grain seeding is 60 percent or more completed throughout the region. Some canola,
corn and flax planting continues. Dry bean, soybean and sunflower planting also has started. Small grain that
emerged during the rainy period are in the 2-to 4-leaf stage and generally good condition.

    Scattered soil crusting problems have hampered emergence of small grain, corn and shallow-seeded crops
including canola, crambe and flax. Use of a harrow or rotary hoe is an option to help small grain and corn
emerge through crusted soils.

    The primary weed control operations in progress are for wild oat and quackgrass control. Herbicide applications
have also begun for controlling volunteer sunflower and other annual broadleaf weeds in early-seeded small
grain. Concern for tan spot in winter wheat and early-planted spring wheat have lessened due to the recent dry
conditions. Growers should be monitoring their emerged canola fields for flea beetle injury. Wheat planted near
and after Memorial Day will be less susceptible to wheat midge injury but yield potential decreases, and susceptibility
to leaf rust and barley yellow dwarf virus increases for varieties susceptible to these diseases.

Greg Endres
Area Extension Specialist/Cropping Systems
Carrington Research and Extension Center
Carrington, ND


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