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FROM AROUND THE STATE


ISSUE 3   May 18, 2000

North-Central ND

PEST UPDATE

CRUCIFER FLEA BEETLE ACTIVITY LOW CANOLA.   

     Flea beetle trap catches have generally decreased with the cool, rainy weather since May 7th;
however, trap catches are slowly starting to increase again this week. Sweeping the grassy areas
next to last year’s fields revealed large numbers of flea beetles waiting move out from their
overwintering sites. With warmer weather returning, field scouting is a must for later planted canola
fields – 25% foliar damage as economic threshold.

 

ORANGE WHEAT BLOSSOM MIDGE – THE HIGH RISK PLANTING WINDOW (200 600 DEGREE DAYS) CONTINUES FOR THE NORTHCENTRAL AND NORTHWEST REGIONS.

    
Very little degree day accumulation (40"F base) has occurred during the past week due to the cool,
rainy weather – an average of only 6 heat units per day! The following insect degree days (DD),
using 40"F Base, have been accumulated as of May 16, 2000: Rollette Co., Rolla = 357, Burke Co.,
Columbus = 370, Bottineau Co., Bottineau =389, McHenry Co., Towner = 415; Renville Co.,
Mohall = 405, McLean Co., Turtle Lake = 450, Ward Co., Minot = 460, and Williams Co.,
Williston = 498 (Source:NDAWN).

 

THE LILACS ARE STARTING TO BLOOM AND THE GRASSHOPPERS ARE HATCHING!

   Small instar grasshoppers were observed while sweeping the field edges in Minot last week.
This cold snap may cause some mortality of hatch. However, the grasshopper emergence has
just started and is most likely delayed with the cool temperatures.

 

CUTWORMS PROBLEMS IN RENVILLE-BOTTINEAU COUNTIES

    Early instars (small worms) of dingy cutworms are causing problems with localized canola and
small grains fields. Since these worms are small, they will continue to feed for 5-6 weeks until mature.
As sunflower planting gets underway, growers need to be aware of potential cutworms problems and
scout their fields early for signs of cutworm damage (freshly nipped off plants on ground). The
economic threshold in canola and sunflower is 1 cutworm per square foot or 25-30% of plants cut,
and in small grains 4-5 cutworms per square foot.

 

DIAMONDBACK MOTH CAPTURED IN MINNESOTA

    Low numbers of diamondback moth have been captured on sticky yellow cards in canola fields
near Thief River Falls, Minnesota. Pheromone traps are being set out this week in North Dakota as
part of the Canola Trapping Network.

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

 

South-Central ND

    Total rainfall as recorded at NDAWN sites in south-central ND during May 10-16 ranged from
0.09 inch at Oakes to 1.5 inches at Robinson. Adequate to excessive soil moisture conditions
generally prevail. Air temperatures dipped below 32 degrees on May 13 and 14 at several locations
in this region. Crop injury was negligible.

    Planting progress was hampered due to frequent rainfall during the past week. However, nearly all
small grain, cool-season legume and oilseed acres have been planted with the exception in Sheridan
County. Emerged spring-seeded crops continue to generally be in optimum condition and at adequate
plant densities. Corn and flax planting is near completion. Soybean, dry bean, and sunflower planting
is in progress.

    Postemergence herbicide application in small grain is a common farm activity. Tan spot can be
found in winter wheat and likely will soon be present in spring wheat growing in the past’s crop
residue. Flea beetle feeding pressure in canola has declined due to recent cool temperatures and
moisture.

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

 

Northeastern ND

    Rainfall ranged from .o6 to 1.6 inches this past week. A dry area continues from east and north
of Crary that includes northern Nelson, Walsh and southeast Pembina counties. Flax and canola
stands in this area are spotty. Some replanting of canola is occurring.

    A low temperature in the region of 28 deg. f for four hours was recorded at Cando.
Canola fields I looked at yesterday in the Starkweather area were fine. I do not expect any wide
spread frost damage to crops in our area. Some emerged potato leaves froze in the Cando area.

    Small grains are emerging to 2 leaf. Flea beetles are quiet for now. No other insect problems yet.

    Sunflower, dry bean and soybean planting is occurring. Much durum remains to be seeded.
Stands of early seeded Canola and flax are improving due to rain wetting seedbeds.

    Wild oat seedlings are common along with most other common weeds. Foxtail species are
set to emerge . Recent cool weather is slowing their growth.

Terry Gregoire
Area ExtensionSpecialist/Cropping
tgregoir@ndsuext.nodak.edu


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