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

The Manitoba Insect and Disease Update is now posted at:

Some highlights from the update:


  • 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:
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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:

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.

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.

Larvae of cereal leaf beetle.

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

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