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:
- 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).
- 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