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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 – 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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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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A new season of Manitoba Insect and Disease Updates has started!

The purpose of the updates is to compile information on insects and diseases of current concern to those growing or monitoring crops in Manitoba, and present a summarized weekly report that can alert farmers and agronomists to concerns in their region. This relies on insect and disease observations and concerns being reported by those monitoring crops. So the cooperation of agronomists and farmers in providing information for these reports is greatly appreciated. Results of insect and disease monitoring programs will also be presented in these reports.

A Manitoba Insect and Disease Update for May 13, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2014-05-13.html

HOW CAN YOU CONTRIBUTE? 

Agronomists, Farmers, Farm Production Advisors, and others scouting crops: Please remember to send in reports of insects or plant diseases over the growing season so we can make these updates as complete as possible, and alert farmers and agronomists where and to what degree insects and pathogens are of concern or being controlled.

Information can be sent to:

John Gavloski (MAFRD Entomologist):  [email protected]

or

Vikram Bisht (MAFRD Plant Pathologist): [email protected]

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