Manitoba Insect & Disease Update – Issue 7: June 29, 2016

The Manitoba Insect and Disease Update is now posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2016-06-29.html

Some highlights from the update:

Insects:

  • Alfalfa weevil is still at high levels in some alfalfa fields. Some alfalfa hay fields are being cut early as a result.
  • Pea aphid levels are near or above economic threshold in some pea fields, although levels are sporadic as other fields have quite low levels.
  • A map is provided that shows the percent of wheat midge that are expected to have emerged, based on models using degree days to calculate percent emergence. We are generally above average for degree day accumulation in Manitoba, and it is likely that wheat midge emergence has started in Manitoba, although in many areas it may only be about 10% of the wheat midge that have emerged (light yellow on the map). Some areas of Central and Southwest Manitoba may have closer to 50% emergence (darker yellow on the map).

Plant Pathogens:

  • Brown spot and root rots were found in some soybean fields.
  • Scouting should be continued for rust diseases in cereal crops.
  • A few cases of bacterial blight in cereal crops have been reported.
  • A few cases of downy mildew in sunflowers have been reported.

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

Manitoba Agriculture website: www.manitoba.ca/agriculture
Manitoba Agriculture on Twitter: @MBGovAg
Manitoba Agriculture on YouTube: www.youtube.com/ManitobaAgriculture

 

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Manitoba Insect & Disease Update – Issue 6: June 22, 2016

The Manitoba Insect and Disease Update is now posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/insect-report-2016-06-22.html

Some highlights from the update:

Insects:

  • Cutworm and flea beetle levels and damage continues to decline.
  • Alfalfa weevil is being noted at high levels in some alfalfa fields
  • Barley thrips are quite noticeable in some barley fields in Eastern Manitoba.
  • Low levels of English gain aphid and oat-birdcherry aphid are being found in some cereal fields.
  • Pea aphid is showing up in some pea crops.

Plant Pathogens:

  • Cereal rust diseases continue to develop and spread.
  • Bacterial blight symptoms in winter wheat and oats were also reported.
  • Root rot pathogens continue to cause problems in soybean fields.

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

Manitoba Agriculture website: www.manitoba.ca/agriculture
Manitoba Agriculture on Twitter: @MBGovAg
Manitoba Agriculture on YouTube: www.youtube.com/ManitobaAgriculture

 

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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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