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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 3: June 1, 2016

The Manitoba Insect and Disease Update for June 1, 2016 is now posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2016-06-01.html

SUMMARY

Insects: Cutworms and flea beetles on canola continue to be the insects of greatest concern. The cool, damp weather from the last few days would have slowed cutworm feeding, and the soil moisture, where not excessive, may help the plants compensate for feeding. 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. Precautionary insecticide applications, if cutworm levels are not economical, is not encouraged because of the potential damage to beneficial invertebrates.

Plant Pathogens: Rain has not only provided enough moisture for crops, but also for pathogens causing various crop diseases. Look for early signs and symptoms of diseases in crops. Scout! Scout! Scout!

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 – 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 – 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 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.
rhizoc-root-rot-soy

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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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.
G

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.
S

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?
D

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 – Week of June 2 to 6, 2014

A Manitoba Insect and Disease Update for the week of June 2-6, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-06-03-insect-update.html

Highlights Include:

  • When does the canola become more resistant to flea beetles?
  • Estimating % defoliation. Estimating % defoliation can be tricky, as our eyes are drawn to the damage and it is easy to overestimate  how much feeding has occurred. Having a photo key as a guide can be useful for learning to assess defoliation levels.
  • Cutworm Feeding.  High levels of feeding by cutworms has been noted in sunflowers in the Carman and Sanford areas, and in corn in the Starbuck area.
  • Insecticide application tips for cutworms.
  • Insect Monitoring Programs: 
    • Diamondback moth: Diamondback moth counts have increased in some locations in eastern Manitoba and the Swan River Valley.
    • Bertha armyworm: The map provided in the report indicates at what stage the pupae of the bertha armyworm are in their development. Currently, some may have accumulated enough heat to be about 60-75% through their pupal development.

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

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New Manitoba Insect & Disease Update

A Manitoba Insect and Disease Update for May 27, 2014 has been posted at:

http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-05-27-insect-update.html

A few quick highlights from the update:

  • Wireworms are being noted in a few fields.
  • Invertebrates other than wireworms are also being found in some fields; some organisms that can be confused with wireworms are shown.
  • Monitoring Wheat Fields for Wheat Steak Mosaic. Four winter wheat fields were recently checked for wheat streak mosaic.
  • Diamondback moth counts are still low in spite of some winds from the south.

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

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