NDSU Crop and Pest Report
Plant Pathology


ISSUE 1   May 6, 2004

FUNGICIDE UPDATE FOR BROADLEAF CROPS, 2004

Several fungicide additions and changes for broadleaf crops in North Dakota have been made for the 2004 growing season, and are listed below. Refer to fungicide labels for specific information and directions before making applications.

Amistar (azoxystrobin)

Amistar is a new fungicide from Syngenta that is labeled for use on dry edible bean, chickpea, lentil, field pea, potato, and sugarbeet. Amistar contains the same active ingredient as Quadris fungicide; however, the formulations, use rates, and crops on the labels differ. Amistar belongs to the strobilurin (QoI, group 11) chemistry class of fungicides. This class of fungicides has the risk of plant pathogens developing resistance to it if resistance management practices are not used.

Dry edible bean

Chickpea, lentil, field pea

Potato

Sugarbeet

Endura (boscalid)

Endura is a new foliar fungicide from BASF that is labeled for use on canola, dry edible bean, chickpea, lentil, and potato. Endura belongs to the oxathiin (group 7) chemistry class of fungicides, which makes it a good rotational partner with a strobilurin fungicide.

Canola

  • Sclerotinia stem rot, 5-6 oz/A
  • Dry edible bean

  • Rust, white mold, 8-11 oz/A
  • Chickpea, lentil

  • Ascochyta, white mold, 6 oz/A
  • Potato

  • Early blight, 2.5-4.5 oz/A
  • White mold, 5.5-10 oz/A
  • Tanos (famoxadone; cymoxanil)

    Tanos is a new foliar fungicide from DuPont that is labeled for use on potato. Tanos contains fungicides from two different classes (group 11 and group Y). Because Tanos contains a group 11 fungicide, it should not be used back to back with another group 11 fungicide (strobilurin, QoI).

    Potato

  • Early blight, 6-8 oz/A
  • Late blight, 8 oz/A
  • Label change for Quadris (azoxystrobin)

    Quadris fungicide from Syngenta has added the following crops to the label: dry edible bean, chickpea, lentil, and field pea.

    Dry edible bean

  • Rust, apply 6.2 fl oz/A
  • Anthracnose, apply 6.2-15.4 fl oz/A
  • Chickpea, lentil, field pea

  • Ascochyta, anthracnose, apply 6.2-15.4 fl oz/A
  • Section 18 request update

    The following section 18 exemption requests have been submitted to the EPA for the 2004 growing season:

  • LSP/Mertect LSP on lentil: Approved
  • Folicur on sunflower: Pending
  • Quadris on safflower: Pending
  • Eminent on sugarbeet: Approved
  • Carl Bradley
    Extension Plant Pathologist
    carl.bradley@ndsu.nodak.edu

     

    DISEASES DEVELOPING ON SOUTHERN PLAINS WINTER WHEAT

    With ND wheat in various stages - from early emergence to not yet planted - wheat diseases are not on most ND producerís minds. But in southern plains states, where wheat is past jointing to headed, a number of diseases are apparent, some of which have the potential to impact our wheat crops.

    Dr. Bob Hunger, Oklahoma State University plant pathologist, reported on April 29th that barley yellow dwarf virus (BYDV) is very common in his stateís wheat. BYDV also is the major disease currently observed in Arkansas wheat. Aphids that vector BYDV have the potential to move northward to our wheat crops during the growing season.

    Damage from BYDV depends on the age of the crop when infected; the earlier in the growth stage of the crop that the aphids arrive and transmit the virus, the more severe the crop damage.

    The 3rd issue of the 2004 Cereal Rust Bulletin of the USDA Cereal Disease Lab, St. Paul, indicated that the incidence and severity of wheat leaf rust is increasing in Oklahoma and Texas, and light levels have been observed in Kansas. Recent rains and dews in the southern wheat states have favored leaf rust development. Continued wheat leaf rust development means potential for leaf rust spores to move northward into our crops.

    In contrast, wheat stripe rust levels currently are very low in these states. The USDA Cereal Disease Lab also reports that oat crown rust is severe in Texas at this time.

     

    CEREAL FUNGICIDE UPDATE

    Several new products for cereals have been registered since the last growing season and one Section 18 request was recently granted.

    Seed Treatments

    Incentive RTA Seed Treatment: Agriliance has registered a wheat seed treatment product called Incentive RTA. The active ingredients are difenoconazole at 3.21% a.i. and mefenoxam at 0.27% a.i. These are the same active ingredients and proportions as in Dividend XL RTA seed treatment.

    The use rates for Incentive RTA on wheat are:

  • 2.5 fl oz/cwt for common bunt and loose smut;
  • 5 fl oz/cwt for seedborne Septoria and Fusarium, Pythium damping-off, and partial control of common and Rhizoctonia root rots;
  • 10 fl oz/cwt for partial control of Fusarium root and crown rot and of take-all root rot.
  • Dynasty Seed Treatment: Dynasty seed treatment was registered by Syngenta for use on wheat, barley and corn cereal crops. The active ingredient is azoxystrobin at 9.6% a.i., the same active ingredient and content as Protege seed treatment.

    Use rates for Dynasty seed treatment are:

  • 0.153-0.382 fl oz/cwt for seed and seedling diseases of wheat and barley;
  • 0.153 fl oz/cwt for seed and seedling diseases of corn.
  • Foliar Fungicides

    Quilt: Quilt fungicide was registered by Syngenta for control of certain diseases in wheat, barley and corn. Quilt contains two active ingredients with different modes of action: azoxystrobin (same ingredient as Quadris) and propiconazole (same ingredient as Tilt). The % a.i.: 7% azoxystrobin and 11.7% propiconazole.

    Quilt is registered for wheat and barley for suppression of early season tan spot and Septoria and for control of leaf rust, Septoria diseases and wheat tan spot at the flag leaf stage.

    The use rates for Quilt in wheat and barley are:

  • 7 fl oz/A for early season application to control tan spot and Septoria;
  • 10.5-14 fl oz/A of Quilt for flag leaf application for control of leaf rust, Septoria diseases, and wheat tan spot.
  • The use rates for Quilt in corn are:

  • 7-14 fl oz/A for control of Northern corn leaf blight and northern corn leaf spot;
  • 10.5-14 fl oz/A: for rust, gray leaf spot, and eye spot control.
  • Please see the Quilt label for additional information on tank mixes, use suggestions and use restrictions.

    Folicur Section 18: Folicur fungicide, a Bayer CropScience product, recently received a Section 18 Emergency Exemption in ND and MN for use on wheat and barley to suppress Fusarium head blight (scab). All classes of wheat, including winter wheat and durum, and spring barley are included in the Sec. 18. The active ingredient in Folicur is tebuconazole.

    A maximum of one application per season may be made. The Sec. 18 label for wheat was amended this week to allow a minimum of 3 gpa for aerial application; the barley label also states a minimum of 3 gpa for aerial application. Both labels state a minimum of 10 gpa by ground application.

    Folicur may be applied up to Feekes 10.51 for both crops, full head emergence in barley and early flowering in wheat; the pre-harvest interval is 30 days.

    The use rate for Folicur is:

  • 4 fl oz/A maximum per season.
  • The ND Folicur Sec. 18 labels for wheat and barley may be down-loaded from the following web addresses:

    The NDSU Pesticide Training and Certification site:

    http://www.ag.ndsu.nodak.edu/aginfo/pesticid/pesticid.htm

    The ND Dept. of Ag. web site:

    http://www.agdepartment.com/Programs/Plant/Section18Exemptions.html

    Marcia McMullen
    Extension Plant Pathologist
    marcia.mcmullen@ndsu.nodak.edu

     

    PLANT DIAGNOSTIC LAB UPDATE

    Itís the start of more than a new season in the Plant Diagnostic Lab. As 2004 gets underway, there will be a new face at the helm in the lab. Beginning May 10, Kasia Kinzer will be the new diagnostic plant pathologist. She was born in Minnesota, but spent some of her youth in Arizona where she earned her bachelorís degree at Arizona State. Returning to Minnesota, Kasia completed a masterís degree from the U of MN. She has worked in Iowa, Idaho, and in Minnesota, so she brings a diversity of experience to the lab. Stop in or give her a call by way of introduction.

    As the outgoing diagnostician, this is my last pest report article and Iíd like to offer my sincere thanks for the opportunity to be a part of this extraordinary team at NDSU; and for the chance to interact with all of you who collaborate and operate with extension, the diagnostic lab, and the great team of scientists in agriculture at NDSU. It has been my good fortune to learn from, be mentored by, and to enjoy the company of some wise, wonderful, and very knowledgeable colleagues. I have grown both personally and professionally while here, and much of that I owe to a terrific roster of clients as well. I discovered early that ND growers, consultants, and associated groups are a savvy, intelligent lot! You push us all to stay on top of our game. It has been a pleasure serving you in my capacity in the Plant Diagnostic Lab.

    Cheryl Biller
    diaglab@ndsuext.nodak.edu


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