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ISSUE 1  May 4, 2000

WIREWORMS ARE ACTIVE!
   Some wireworm problems have been reported in the north central and western ND counties in fields that were fallow last year. Several crops are being attacked - canola, hard red spring wheat, durum. Wireworm larvae become active when soil temperatures warm up to 50-55"F. Wireworm bait stations can be placed out in the field before planting to determine if wireworm populations are high. The bait trap consists of presoaked whole grain bait (1:1 mixture of corn and wheat), which is placed at a depth of 3-6 inches and 6-9 inches wide at the soil surface. Soil is loosely mounded over the bait in a dome shape,
and covered with a piece of black plastic to promote soil warming. Randomly distributing about 5-10 traps per field is practical. Dig up bait after 7-10 days and count the number of wireworms. An average of one wireworm per bait station extrapolates to approximately 40,000 wireworms/acre and signifies an economic infestation.

Janet J. Knodel
Area Extension Specialist Crop Protection, Minot, ND

 

INSECTICIDE TREATMENTS FOR PROTECTING SEED FROM SOIL INSECTS
   Seed or planter box treatments are used on a wide variety of North Dakota crops for protection from seedcorn maggot, wireworms, and/or seedcorn beetle. The following tables highlight common treatments, labeled crops, and the insecticide component of the treatments.

Common North Dakota Seed Treatments
(labeled crops indicated by "x")

Seed Treatment Corn Wheat Barley Soybean Sunflower Dry Bean Peas

Agrox DL Plus

x - - - - x x

Agrox Premiere

x - - - - - -

Agrox 2-Way

x - - - - - -

Assault 25

x - - x - - -

DB Green

x x x - - - -

Diazinon 50W

x - - - - - x

Enhance Plus

- x x - - - -

Germate Plus

x - - - - x -

Isotox F

x x - - x x -

Kernel Guard

x - - - - x x

Kernel Guard Supreme

x - - x - - -

Lorsban 50SL*

x - - - - x x

Grain Guard Plus

x

x

x

x

-

-

x

Raze

x

-

-

-

-

-

-

Sorghum Guard

x

x

x

x

x

-

x

 

Active Ingredients in Common ND Seed Treatments

Seed Treatment

Insecticide

Fungicide

Agrox DL Plus

lindane, diazinon

Captan

Agrox Premiere

lindane, diazinon

Captan, Metalaxyl

Agrox 2-Way

diazinon

Captan

Assault 25

permethrin

-

DB Green

lindane

Maneb

Diazinon 50W

diazinon

-

Enhance Plus

lindane

Maneb, Carboxin

Germate Plus

lindane, diazinon

Carboxin

Isotox F

lindane

Captan

Kernel Guard

lindane, diazinon

Captan

Kernel Guard Supreme

permethrin

Carboxin

Lorsban 50SL*

chlorpyrifos

-

Grain Guard Plus

lindane

Maneb

Raze

tefluthrin

-

Sorghum Guard

lindane

Captan

 

INSECTICIDE UPDATES FOR 2000
Canola
       
Capture 2E - by FMC Corp.
   
Active ingredient: Bifenthrin (pyrethroid). Insect pests controlled include: Crucifer flea beetle, grasshopper, aphids, armyworms, cutworms, and other lepidopterous pests. Labeled rate: 2.1 to 2.6 fl oz. A reduced rate for flea beetle control is being considered.

        Helix seed treatment - Issued as Section 18
        A section 18 was granted for the importation of canola seed treated with Helix. Helix contains thiamethoxam (Adage) insecticide and the fungicides mefenoxam (Apron XL), difenoconazole (Dividend) and fludioxonil (Maxim).The section 18 is for the use of Helix to control flea beetle. The fungicides control seed borne blackleg, as well as soil borne damping off fungi including Rhizoctonia, Fusarium and Pythium. It allows for importation of Helix treated seed to plant up to 200,000 acres of canola in North Dakota, 50,000 acres in Minnesota and 1,400 acres in South Dakota. (Information provided by Art Lamey,
Extension Plant Pathologist, alamey@ndsuext.nodak.edu)

Corn
      Warrior T
- Zeneca, Issued as Sect 2(ee)
    Active ingredient: lambda cyhalothrin (pyrethroid). The corn label has been expanded to include wireworm control when applied as an at planting, in-furrow treatment. The rate is 1.92 fl oz/A when applied into the seed furrow behind the furrow opener and in front of press wheel.


WHEAT MIDGE – THE HIGH RISK PLANTING WINDOW IS HERE!

   Across the state we have exceeded 200 Degree Days (40oF). The date for this bench mark begins the high risk planting window for HRSW. We have reached this point by early May the past three seasons. Though wheat midge populations are much lower throughout most of the state, wheat planted during the next few weeks will head when midge flights are expected. Plan to scout these fieldsat that time.

Date when 200 DD (40oF) were accumulated, 2000

00 plntdate.gif (16620 bytes)

Phillip Glogoza
Extension Entomologist
pglogoza@ndsuext.nodak.edu


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