2015 Fusarium Head Blight Risk Maps On-Line!

The Fusarium Head Blight Risk Map webpage will be available at http://www.gov.mb.ca/agriculture/crops/seasonal-reports/fusarium-head-blight-report.html
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This website will be updated daily Monday to Friday with the current risk maps.
Please refer to the risk maps to help decide risk to your crop, based on heading and flowering stage of your crops.  Remember the disease triangle – the existence of a disease requires three factors: the interaction of a susceptible host, a virulent pathogen, and an environment favorable for disease development. Therefore, although a risk map may show High to Extreme risk levels due to environment, disease risk may be low if the wheat crop is not at the proper stage for infection.
Depending on the weather, wheat can move through the following stages of development below in as little as five days to more than a week.  So if a fungicide for FHB suppression is planned, scout your fields daily to ensure proper timing.
Wheat Development Stages
Submitted by:  Pam de Rocquigny, Provincial Cereal Crops Specialist, MAFRD & Holly Derksen, Plant Crop Pathologist, MAFRD
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Manitoba Insect & Disease Update – July 28 to August 1, 2014

A Manitoba Insect and Disease Update for the week of July 28-August 1, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-update-2014-08-01.html

Highlights include:

Pathology:

  • Fusarium head blight risk for wheat is moderate to low in different areas of Manitoba. Most of the wheat crops have finished flowering and thus at low risk. By end of the month, Fusarium head blight risk maps may not be needed.
Entomology:
  • Grasshoppers continue to be a concern in some fields.
  • Canola growers should be checking canola for Lygus bugs. Lygus can potentially be of concern when they feed on the pods of canola if levels are high, although feeding to flowering crops is not likely to be economical as canola has a very good ability to compensate for damage to flowers, especially when soil moisture is good. So far Lygus levels appear to be below economic levels in canola, with a few exceptions in the Eastern part of Manitoba.

Note: For those monitoring traps for bertha armyworm, the traps can be removed after you do your counts this week. We have enough weeks of data to know what the regional risks are. Overall trap counts in Manitoba were quite low this year. A map of the cumulative counts, as of July 28th, is posted in the update, and risk maps are also posted at the following MAFRD website (the July 28th map will be posted tomorrow): http://www.gov.mb.ca/agriculture/crops/insects/bertha-armyworm-forecast.html

Submitted by: John Gavloski, Entomologist & Vikram Bisht, Pathologist, MAFRD

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Manitoba Insect & Disease Update – Week of July 21st to 25th

A Manitoba Insect and Disease Update for the week of July 21-25, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-update-2014-07-25.html

Highlights include:

Pathology:
  • Goss’s wilt and leaf blight disease are showing up in corn.

Corn leaf with well developed leaf blight of Goss’s Wilt disease. Photo: Vikram Bisht, MAFRD

  • Ergot disease infection is now showing up in fall rye and grasses.
  • Blackleg infection on lower stems/roots on canola is showing up.
  • Downy mildew on sunflowers is reported.
Entomology:
  • Grasshoppers are starting to mature to the adult stage. How much they move into crops from surrounding vegetation may partially depend on how lush the roadside vegetation remains relative to the crop.
  • Still no soybean aphids found in Manitoba in 2014.

Submitted by: John Gavloski, Entomologist & Vikram Bisht, Pathologist, MAFRD

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Manitoba Insect & Disease Update – Week of July 14th to 18th

A Manitoba Insect and Disease Update for the week of July 14-18, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-update-2014-07-16.html

Highlights include:

  • Flowering canola crop needs to be protected against white mold since there have been many rain events lately.
  • Phytophthora root rot of soybean has started showing up, especially in flooded fields.
  • Early lesions of sunflower rust have been found in a 2nd location.
  • Alfalfa weevil levels were quite noticeable in some alfalfa fields, but they are now starting to pupate, so levels are declining.

Submitted by: John Gavloski, Entomologist & Vikram Bisht, Pathologist, MAFRD

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Manitoba Insect & Disease Update – Week of July 7th to 11th

A Manitoba Insect and Disease Update for the week of July 7-11, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2014-07-09.html

A few quick highlights from the update:

  • Leaf rust spots have been observed in fall rye as well as a few spots resembling Septoria leaf spot.
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Leaf rust spots on fall rye, 2014. Photo courtesy: Vikram Bisht, MAFRD

  • Blackleg spots can be found on canola foliage.
  • Remember to collect samples or notify someone from MAFRD if you are noticing cereal leaf beetle in cereal crops. Levels are quite low in Manitoba, however we are doing a  release of a parasitoid that is very effective at keeping cereal leaf beetle at low levels. The samples of larvae will be sent to AAFC in Lethbridge, where they will be examined for parasitoids. Areas of Manitoba where larvae are present but not already containing parasitoids will be given priority for parasitoid releases.
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Larvae of cereal leaf beetle.

Submitted by: John Gavloski, Entomologist & Vikram Bisht, Pathologist, MAFRD

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Manitoba Insect & Disease Update – Week of June 23 to 27

A Manitoba Insect and Disease Update for the week of June 23-27, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-06-24-insect-update.html

A few quick highlights from the update:

  • Fusarium head blight risk is currently high for winter wheat close to or already heading.
  • Rhizoctonia root rot is also being seen in some soybean fields.
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Rhizoctonia root rot with reddish-brown discoloration. Photo courtesy: Vikram Bisht, MAFRD

  • Cutworms remain a concern in some areas, although levels of larvae should start to decline as they pupate.

Submitted by: John Gavloski, Entomologist & Vikram Bisht, Pathologist, MAFRD

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Managing Wheat and Canola Disease With Fungicides

With rainfall throughout the province in the past week and crops advancing into heading/flowering, the need for fungicide crop protection products to protect canola and wheat crops is probable.  The attached document outlines ideal conditions for disease development, and management timing based on crop stage.

It is important to note that fungicides work to control disease, spraying in the absence of disease is an extra cost without the yield benefit.

Managing Disease with Fungicide Fact Sheet: Fungicides Fact Sheet

Prepared by Holly Derksen, MAFRD Field Crop Pathologist

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