Stephen Wegulo
faculty
- Professor Plant Pathology University of Nebraska–Lincoln
Work
402-472-8735
On campus, dial 2-8735
Faculty Bio
Website: Wheat Disease section of CropWatch Plant Disease Management
Twitter: @wegulo2
Factors to Consider When Deciding Whether to Treat Stripe Rust in Wheat
May 22, 2015
The first appearance of stripe rust pustules in a field indicates that spores arrived in the field and initiated infections at least seven days earlier. Apply a fungicide if stripe rust is seen in a field and the following conditions or factors exist:
- Wet, cool weather.
- The flag leaf has emerged (or earlier depending on the situation).
- It's a susceptible variety.
Wheat Disease Update
May 13, 2016
Wheat is heading, headed, or flowering in most fields in eastern Nebraska. The Fusarium Head Blight Prediction Center is currently showing a low risk for scab in Nebraska. However, due to the recent rains, there is a possibility that some level of scab may occur in some fields, and the risk will be higher in areas that receive rainfall in the next 10 days. Base the decision to apply a fungicide to suppress scab on the risk level, the cost of application, and the price of wheat.
Stripe Rust Widespread in Wheat But Mostly At Low Levels
May 6, 2016
Report of this week's wheat disease survey: On May 3 stripe rust was observed for the first time at the UNL Havelock Farm in Lincoln, where incidence was low and severity ranged from trace to high. t the Agricultural Research and Development Center near Mead on May 3, infections had spread from small hot spots one to two weeks earlier to larger areas in research plots, and leaf damage was apparent Wheat growth stage at these two locations ranged from flag leaf emergence to heading. On May 5, field surveys found stripe rust to be widespread in the west central and southern Panhandle of Nebraska. The flag leaf had not emerged or was just starting to emerge in these parts of the state. Wheat mosaic virus was identified in Deuel County.
Wheat Disease Update: Leaf Rust Confirmed in Eastern Nebraska
May 22, 2015
Severity of wheat diseases has increased significantly over the last week. At UNL's Agricultural Research and Development Center (ARDC) near Mead.
Conditions Favorable to Disease Growth in Wheat
April 29, 2016
Wheat field surveys in southeast and south central Nebraska (Lancaster, Saunders, Saline, Filmore, Thayer, Nuckolls, Webster, and Clay counties) on April 27-28 found little disease in growers’ fields. The wheat crop looked healthy and was growing vigorously (Figure 1) thanks to the recent rains.
After Rains, Some Wheat Diseases Increasing
April 22, 2016
Following rains across much of the state last week, wheat diseases appear to be increasing, based on field surveys this week. Reported diseases include powdery mildew, stripe rust, and leaf spot.
Stripe Rust & Aphids Confirmed in Nebraska Wheat
April 15, 2016
Wheat disease surveys on April 8 and April 12-14 found stripe rust and leaf rust at trace to low levels in south central and southeast Nebraska and in the Panhandle. Given the locations of outbreaks in Banner County this spring are the same as when the disease was identified in seedlings last fall, the two rusts may have overwintered. See more reports and management recommendations.
Wheat Leaf Rust Confirmed in Nebraska
March 31, 2016
On March 30, leaf rust was found in several wheat fields in Nuckolls County in south central Nebraska. Severity was trace (Figure 1), but the rust was found in every field surveyed. Presence of leaf rust in Nebraska this early in the growing season suggests it may have overwintered or is a result of unusually warm winter temperatures which resulted in earlier than normal movement of spores from southern states into our region.