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Manitoba Insect & Disease Update – Issue 4: June 8, 2016

The Manitoba Insect and Disease Update for this week is now posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2016-06-08.html

Summary
Insects: Cutworms are getting larger and have been an issue in some fields. The highest level of damage appears to be in the Northwest, where there has been some reseeding because of cutworm feeding. Flea beetle feeding continues, although foliar use of insecticides for flea beetle management has not been widespread. In many fields plants are now getting to stages more tolerant to feeding by flea beetles.

Plant Pathogens: Stripe rust has been detected in Manitoba. Scout for stripe rust and report any detection. Stripe rust incidences will need to be closely monitored.

Stripe Rust in Winter Wheat Near Gladstone, MB (June 8, 2016)_A.Knaggs

Stripe Rust in Winter Wheat Near Gladstone, MB (June 8, 2016). Photo by A. Knaggs.

To be placed on an E-mail list so you will be notified immediately when new Manitoba Insect and Disease Updates are posted, please contact John Gavloski at 204.745.5668.

Submitted by: John Gavloski, Entomologist & Pratisara Bajracharya, Field Crop Pathologist, Manitoba Agriculture

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Manitoba Insect & Disease Update – Issue 2: May 25, 2016

The Manitoba Insect and Disease Update for this week is now posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2016-05-25.html

SUMMARY

Insects: Cutworms and flea beetles on canola are the insects of greatest concern currently. Seed treatments should still be effective against flea beetles in most canola fields, although scouting for feeding damage is encouraged, especially in the earlier seeded fields where seed treatments may soon start losing effectiveness. Cutworm levels are quite variable, hard to find in some fields, more noticeable in others. So scout for potential cutworm feeding on emerging plants and dig for the larvae if you find an area that is showing signs of cutworm feeding.

Plant Pathogens: Scouting for stripe rust in wheat and seedling diseases in emerging crops will be important.

Submitted by: John Gavloski, Entomologist & Pratisara Bajracharya, Field Crop Pathologist, Manitoba Agriculture

Visit the Insect Pages of our Manitoba Agriculture website at http://www.gov.mb.ca/agriculture/crops/insects/index.html

 

 

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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 June 16th

A Manitoba Insect and Disease Update for the week of June 16-20, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-06-17-insect-update.html

Highlights include:

  • Cutworms continue to be an issue in some areas.
  • Flea beetle populations remain a concern in some areas, although the cool weather and advance of many canola fields to stages more tolerant to feeding has resulted in decreased damage.
  • Grasshoppers are emerging, but generally still in the first and second instar stages.
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Juvenile grasshopper (left) and non-economical species of leafhopper (right) (MAFRD)

  • Alfalfa weevil larvae are starting to be noticed in some alfalfa fields.
  • Brown spot (Septoria) and bacterial leaf blight have been observed in soybeans.
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Early stage of bacterial blight spots and brown spot disease on unifoliate leaves of soybean (MAFRD)

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

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Manitoba Insect & Disease Update – Week of June 9 to 13th

A Manitoba Insect and Disease Update for the week of June 9-13, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-06-10-insect-report.html

HIGHLIGHTS INCLUDE:

Current Insect Scouting Priorities

  • Flea beetles: Foliar spraying, in addition to the seed treatments, is occurring in many areas.
  • Cutworm: Dingy and redbacked cutworms seem to be our dominant species.  How long will they feed? Will crops compensate for some cutworm feeding?
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Dingy Cutworm

  • Check field edges to assess levels of emerging grasshoppers.

Insect Monitoring Update

Diamondback Moth: It is likely that we had a moderate population of diamondback moth blow into some areas of Manitoba.  Weekly maps for the monitoring program for diamondback moth can be found at: http://www.gov.mb.ca/agriculture/crops/insects/diamondback-moth-monitoring.html

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

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Manitoba Insect & Disease Update

Summary

  • Insect and disease activity continues to be low on crops in Manitoba.
  • The cool temperature has slowed the emergence of many insects.
  • There is no evidence to date of any major movement of insects that get blown into Manitoba form the southern U.S., such as diamondback moth and aster leafhopper.

The update provides information on the following topics:

Grasshoppers: When will emergence likely start? Degree day models can be used to forecast anticipated dates of emergence for these pest species. Based on such models it will likely be early-June before we see a start to the emergence of these species of grasshoppers in most areas.

Recent Rain and Grasshoppers? The recent rains will likely do very little to negatively impact the survival of our pest species of grasshoppers.

Insect Monitoring Programs.  Updates on diamondback moth, wireworms & cutworms.

The complete Manitoba Insect and Disease Update for May 21, 2014 with additional information on the above topics has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-05-20-insect-update.html

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

 

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