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

 

Respond
Have a follow-up question?

Manitoba Insect & Disease Update – Week of June 30 to July 4

A Manitoba Insect and Disease Update for the week of June 30 to July 4, 2014 has been posted at: http://www.gov.mb.ca/agriculture/crops/seasonal-reports/insect-report-archive/2014-07-02-insect-update.html

  • Information is provided on the potential effects of flooded fields on grasshoppers and wireworms.
  • Brown spot and bacterial leaf blight have been occurring in some soybean fields; risk of Fusarium head blight in cereals is high to extremely high.
2014-07-03-brownspotdisease

Brown spot disease on lower leaves of canopy. Photo courtesy: Vikram Bisht, MAFRD

  • Forecasts for emergence of wheat midge and a key parasitoid of wheat midge are provided.

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

Respond
Have a follow-up question?
,

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

Respond
Have a follow-up question?

2013 Soybean Issues that are Getting Farmers Excited!

Pictures and Information Prepared by Dennis Lange, MAFRI Farm Production Advisor – Altona

 A number of questions have arisen on various soybeans diseases and conditions seen in 2013 fields:

  1. Iron Chlorosis
  2. Sunburn
  3. Bacterial Blight
  4. Septoria Brown Spot
  5. Fusarium Root Rot
  6. Rhizoctonia Root Rot
  7. Phytophthora Root Rot                
  8. Downy Mildew

Even though there is nothing growers can do to fix these concerns in the 2013 crop, it is important to identity what is going on for future management, as  crop rotation help to control these diseases.  Please see the attached detailed explanation with pictures on what is exciting 2013 Manitoba soybean growers in their fields.

 2013 Soybeans Issues That are Getting Growers Excited

 

Respond
Have a follow-up question?