Remember the DISEASE TRIANGLE when using MAFRD’s FHB Risk Maps

Previously published June 2, 2014, updated June 24, 2015

MAFRD is providing daily maps on the risk of Fusarium Head Blight (FHB) infection.  The maps are available daily on MAFRD’s website at http://www.gov.mb.ca/agriculture/crops/seasonal-reports/fusarium-head-blight-report.html. The risk map produced June 24th (see below) shows how the risk for the development of  fusarium head blight has increased over the past few days based on temperature and moisture.

2015-06-24-fhb

The changes over the past week signal to producers to continually scout their fields for local conditions as their crop progresses.  But remember the disease triangle – the existence of a disease requires three factors: the interaction of a susceptible host, a virulent pathogen, and an environment favorable for disease development. Therefore, although the most current risk map shows high risk levels due to environment in some areas of the province, disease is prevented if the winter/spring wheat is not at the proper stage for infection.

Submitted by:  Pam de Rocquigny, Provincial Cereal Crops Specialist, MAFRD

 

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Weekly Precipitation – May 11th to May 18th

More precipitation fell across Manitoba over the past week, with accumulations ranging from zero to over 90 mm.

A feature of MAFRD’s Ag-Weather Program is the Rain Watch site (http://tgs.gov.mb.ca/climate/DisplayImage.aspx?StationID=RainWatch) which shows accumulation of rainfall in the past hour, since midnight and since the start of the month.   It is updated daily.

The Manitoba AgWeather Program has provided the map below showing Weekly Accumulated Precipitation from May 11th to May 18th.

7-Day Accumulated Rainfall

Of course each individual weather station may not capture exactly happened in your neck of the woods due to the inherent variability of weather events, i.e. thundershowers.

More information on the Manitoba Ag-Weather Program can be found at http://tgs.gov.mb.ca/climate/Default.aspx

Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist MAFRD, on behalf of the Manitoba AgWeather Program.

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Manitoba Ag-Weather Program Update – May 1st to May 10th

The following MAFRD weather maps illustrate Accumulated Precipitation, Corn Heat Units (CHU) and Growing Degree Days (GDD), along with  Percentage of Normal for Precipitation, CHU & GDD for data collected through the Manitoba Ag-Weather Program from May 1, 2015 to May 10, 2015.

Accumulated Precipitation – May 1st to May 10th

Percentage of Normal Accumulated Precipitation – May 1st to May 10th

Accumulated Growing Degree Days (GDD) – May 1st to May 10th

Percent of Normal Accumulated GDD – May 1st to May 10th

Accumulated Corn Heat Units (CHU) – May 1st to May 10th

Percent of Normal Accumulated CHU – May 1st to May 10th

For more information on the Manitoba Ag-Weather Program, visit MAFRD’s website at:  http://www.gov.mb.ca/agriculture/weather/manitoba-ag-weather.html

For individual station data, visit http://tgs.gov.mb.ca/climate/CurrentConditions.aspx

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Will the Recent Cold Snap Impact Winter Wheat?

The cold temperatures arrived quickly in Manitoba.  And with those cold temperatures and the minimal snow cover, I received my first “how is the winter wheat doing with the recent cold snap?” question of the 2014/15 winter wheat crop year!

The quick answer is the cold snap likely hasn’t had much of an impact.  In looking at the soil temperatures in the four winter wheat fields we have real-time monitoring in (see the CropChatter post at http://cropchatter.com/real-time-regional-winter-wheat-in-field-soil-temperature-monitoring/), soil temperatures have dipped around the minus 5 degree Celsius mark.  Fortunately, winter wheat is at its hardiness in November and December (see below Figure).  Also, in the late fall (prior to Dec. 20), the soil has a large heat capacity and decreases in soil temperature lag considerably behind decreases in air temperature. Therefore, the probability of the recent cold snap damaging the winter wheat crop is very low.

Picture1Source:  Winter Cereal Production, University of Saskatchewan

We also need to remember that many winter wheat acres were seeded under “optimal” conditions, including before or at recommended seeding dates, into fields with standing stubble, and into good soil moisture helping the crop emerge quickly and uniformly (reaching the recommended stage of 3 leaf to 1 tiller prior to snow fall).  These best management practices lend themselves to a winter wheat crop that is well-hardened.

However, even with those positives, we still need good snow cover starting mid-December to protect the crop from the sustained cold temperatures we typically see in January and February in Manitoba.

Submitted by:  Pam de Rocquigny, Provincial Cereal Crops Specialist, MAFRD

 

 

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Manitoba Ag-Weather Program Update – May 1st to September 21st

The following MAFRD weather maps illustrate Accumulated Precipitation, Corn Heat Units (CHU) and Growing Degree Days (GDD), along with  Percentage of Normal for Precipitation, CHU & GDD for data collected through the Manitoba Ag-Weather Program from May 1, 2014 to September 21, 2014.

AG MET Maps Total Precip Sept 21 2014  AG MET Maps PN Precip Sept 21 2014

 

 AG MET Maps GDD Sept 21 2014   AG MET Maps PN GDD Sept 21 2014

 AG MET Maps CHU Sept 21 2014  AG MET Maps PN CHU Sept 21 2014

For more information on the Manitoba Ag-Weather Program, visit MAFRD’s website at:  http://www.gov.mb.ca/agriculture/weather/manitoba-ag-weather.html

For individual station data, visit http://tgs.gov.mb.ca/climate/CurrentConditions.aspx

Submitted by: Mike Wroblewski, MAFRD Ag Meteorologist & Pam de Rocquigny, Provincial Cereal Crops Specialist

 

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Minimum Temperatures Reached September 12th

A PRELIMINARY map was created using data from MAFRD’s Ag-Weather Program that shows the Minimum Temperatures reached on September 12th.

Tmin20140912

More frost events were recorded Monday, September 15th.

More detailed weather information and the potential impact to crops will be available in Issue #20 of the Manitoba Crop Report at:  http://www.gov.mb.ca/agriculture/crops/seasonal-reports/crop-report-archive/index.html

More information on the Manitoba Ag-Weather Program can be found at http://tgs.gov.mb.ca/climate/Default.aspx

Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist & Mike Wroblewski, Ag Meteorologist, MAFRD

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Manitoba Ag-Weather Program Update – May 1st to September 7th

The following MAFRD weather maps illustrate Accumulated Precipitation, Corn Heat Units (CHU) and Growing Degree Days (GDD), along with  Percentage of Normal for Precipitation, CHU & GDD for data collected through the Manitoba Ag-Weather Program from May 1, 2014 to September 7, 2014.

Accumulated Precipitation – May 1st to September 7th, 2014

Percent of Normal Accumulated Precipitation – May 1st to September 7th, 2014

Accumulated Corn Heat Units (CHU) – May 1st to September 7th, 2014

Percent of Normal Accumulated CHU – May 1st to September 7th, 2014

Accumulated Growing Degree Days (GDD) – May 1st to September 7th, 2014

Percent of Normal Accumulated GDD – May 1st to September 7th, 2014

For more information on the Manitoba Ag-Weather Program, visit MAFRD’s website at:  http://www.gov.mb.ca/agriculture/weather/manitoba-ag-weather.html

For individual station data, visit http://tgs.gov.mb.ca/climate/CurrentConditions.aspx

Submitted by: Mike Wroblewski, MAFRD Ag Meteorologist & Pam de Rocquigny, Provincial Cereal Crops Specialist

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The Dreaded “F” Word – FROST

Given its sporadic nature, long-range forecasting of frost is nearly impossible. Rather, the climate record of an area is used to determine probable dates of frost based on long-term temperature records. While this will not provide an actual frost date in a particular year, it will present the likelihood that frost may occur on a certain date.

The “Date of First Fall Frost” maps at 50%, 25%, and 10% risk show the likelihood that frost will occur on or before the dates shown within the maps. A frost would be expected to occur 1 in 2 years at the 50% risk date, 1 in 4 years at the 25% risk date, and 1 in 10 years at the 10% risk date.

The extent of frost damage to a crop will depend on several factors. The crop type, stage, and hardening of the crop, the soil type and soil moisture, the actual air temperature, the duration of freezing, and the rapidity with which freezing takes place are all important. A drop in air temperature of short duration will cause less damage than a prolonged period at the same low temperature. When the air temperature drops to 0°C, cereal and other crops may not sustain damage. Rather, damage or total loss is more common when minimum temperatures drop below -2°C, often referred to as a killing frost.

For more information on Manitoba’s Agricultural Climate, please visit our website at  http://www.gov.mb.ca/agriculture/weather/agricultural-climate-of-mb.html

Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist, Manitoba Agriculture

Information from the article “Risk of Fall Frost” by Andy Nadler, 2010

 

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Another Rainy Week in Manitoba

It was yet another rainy week in Manitoba.  The map below, created using data from MAFRD’s Ag-Weather Program, shows the weekly accumulated precipitation from August 25th to September 1st.  More detailed weather information will be available in Issue #18 of the Manitoba Crop Report at:  http://www.gov.mb.ca/agriculture/crops/seasonal-reports/crop-report-archive/index.html

Picture1

More information on the Manitoba Ag-Weather Program can be found at http://tgs.gov.mb.ca/climate/Default.aspx

Submitted by: Pam de Rocquigny, Provincial Cereal Crops Specialist & Mike Wroblewski, Ag Meteorologist, MAFRD

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Manitoba Ag-Weather Program Update – May 1st to August 24th

The following MAFRD weather maps illustrate Accumulated Precipitation, Corn Heat Units (CHU) and Growing Degree Days (GDD), along with  Percentage of Normal for Precipitation, CHU & GDD for data collected through the Manitoba Ag-Weather Program from May 1, 2014 to August 24, 2014.

Accumulated Precipitation – May 1st to August 24th

Percentage of Normal Accumulated Precipitation – May 1st to August 24th

Accumulated Growing Degree Days (GDD) – May 1st to August 24th

Percentage of Normal Accumulated GDD – May 1st to August 24th

Accmulated Corn Heat Units (CHU) – May 1st to August 24th

Percentage of Normal Accumulated CHU – May 1st to August 24th

For more information on the Manitoba Ag-Weather Program, visit MAFRD’s website at:  http://www.gov.mb.ca/agriculture/weather/manitoba-ag-weather.html

For individual station data, visit http://tgs.gov.mb.ca/climate/CurrentConditions.aspx

Submitted by: Mike Wroblewski, MAFRD Ag Meteorologist & Pam de Rocquigny, Provincial Cereal Crops Specialist

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