ISSUE 3 May 27, 2010
NDSU IPM SURVEY BEGINS
Beginning next week, NDSU IPM scouts will survey throughout the 2010 growing season. IPM scouts are trained on survey procedures and identification of diseases and insect pests in wheat, barley, soybean, sunflower and canola. Each scout works closely with a state or area extension specialist in their designated survey region(s). The data the scouts collect is used by county agents and extension specialists to alert producers of any current or imminent pathogen or insect threat. Information that the scouts collect is shared in further subsequent issues of the NDSU Crop and Pest Report.
The 2010 IPM Scouts are:
Suanne Kallis – Southeastern Region, Coordinated by Marcia McMullen (Extension Plant Pathologist)
Ryan Grieger – Northeastern Region, Coordinated by Lionel Olson (Area Extension Specialist, Langdon)
Taylor Mattson – Central and South Central Regions, Coordinated by Greg Endres (Area Extension Specialist, Carrington)
Asanga Manamperi – Northwestern and North Central Regions, Coordinated by Dan Waldstein (IPM Extension Specialist, Minot)
Dixie Dennis – Southwest and West Central Regions, Coordinated by Roger Ashley (Area Extension Specialist, Dickinson)
Sam Markell and Marcia McMullen
Extension Plant Pathologists
STRIPE RUST IN SOUTHERN GREAT PLAINS
Many reports of stripe rust occurrence are coming out of the souther great plains states, such as Oklahoma, Kansas, and most recently from Nebraska. Kansas Extension Plant Pathologists report fairly severe stripe rust in some winter wheat varieties, such as Jagger, Jagalene, Hawken and Overley. Jagalene winter wheat has been grown in North Dakota some years, and Hawken and Overley have been included in NDSU variety trials.
Stripe rust has occurred in ND in the past, but very infrequently and never at severe levels or as a widespread occurrence. Often, by the time stripe rust spores reach our region on prevailing winds, the temperatures are high enough to be unfavorable for infection, ie. when daytime temps are above 80 degrees F, and night time temperatures around 60 degrees F.
We are starting our NDSU IPM survey this week and will be on the look out for any rust development in small grains. We hope that individuals with winter wheat fields will be checking their fields soon for rust development.
We distinguish stripe rust from leaf rust by the color of the spores and the shape of the spore mass on the leaf surface (see picture). Stripe rust consists of pale orange spores found in long, linear lesions, while common leaf rust is more reddish-orange and found in round spore masses. Leaf rust is our most common rust.
Stripe rust (long, pale orange lesions) and leaf rust
(round, reddish-orange to brown lesions) on one wheat leaf.
(Photo by S. Markell)
REMINDER TO SIGN-UP TO RECEIVE SCAB ALERTS
Last week, I indicated how an individual can sign up for scab (Fusarium head blight = fhb) alert messages, which I will send out as the growing season advances. You may sign up for a cell-phone alert or an e-mail alert for messages from our spring grain region. Once I post an alert, the message will tell you that an alert has been posted.
The URL link for the subscription page is:
These alerts have been made possible through a collaborative effort of the US Wheat and Barley Scab Initiative and the national FHB (scab) Prediction Center which operates the FHB forecasting model.
I hope many of you will sign-up. It is a very easy system to use. I will be posting messages periodically to the site as we get closer to the flowering period of our northern crops, and especially if the disease forecasting maps indicate a risk of scab infection somewhere in our state.
People from other states can get alerts for their region. So far, the largest number of subscribers to this posting of alerts comes from ND participants, which is great, but I hope we get many more!
Extension Plant Pathologist