Wheat scab risk elevated to moderate to high

decrease font size  Resize text   increase font size       Printer-friendly version of this article Printer-friendly version of this article

With the recent rainfall and wheat flowering occurring or approaching, the National Fusarium Head Blight Risk Assessment Tool has elevated the risk of scab from low to high in an area of southeast Nebraska and to moderate in areas of eastern, south central, southwest, and north central Nebraska  (Figure 1). This follows a significant amount of rainfall during the second half of last week and the first half of this week. The two high risk areas were designated today.

click image to zoom Scab appears in the field as prematurely whitened or bleached heads. Affected heads are partially or entirely bleached and often are seen suddenly scattered over small, large, or entire areas of the field.

It is recommended that a fungicide be applied at early flowering to suppress scab in scab-prone areas (southeast, south central, and southwest Nebraska). The fungicides Prosaro and Caramba are good in suppressing scab and very good to excellent in controlling foliar diseases.

Timing of fungicide critical

Timing of fungicide application for scab suppression is critical. Early flowering is the optimal time. Once bleached heads appear scattered in the field, it is too late to apply a fungicide for scab suppression.

For fields where wheat is not flowering yet, if foliar disease pressure is low and the flag and flag -1 leaves are free of disease, delay a fungicide application until early flowering and then apply a fungicide that will both suppress scab and provide protection against foliar diseases.

If foliar disease pressure is high and the flag leaf is at risk of infection, consider applying a fungicide to protect the flag leaf and monitor the risk of scab as heading and flowering approach. In this case a second fungicide application to suppress scab may be warranted in high risk and high yield potential fields, such as irrigated fields, if the risk of scab rises prior to flowering.

Refer to the fungicide table for a list of fungicides and their efficacy against various diseases.


Buyers Guide

Doyle Equipment Manufacturing Co.
Doyle Equipment Manufacturing prides themselves as being “The King of the Rotary’s” with their Direct Drive Rotary Blend Systems. With numerous setup possibilities and sizes, ranging from a  more...
A.J. Sackett Sons & Company
Sackett Blend Towers feature the H.I.M, High Intensity Mixer, the next generation of blending and coating technology which supports Precision Fertilizer Blending®. Its unique design allows  more...
R&R Manufacturing Inc.
The R&R Minuteman Blend System is the original proven performer. Fast, precise blending with a compact foot print. Significantly lower horsepower requirement. Low inload height with large  more...
Junge Control Inc.
Junge Control Inc. creates state-of-the-art product blending and measuring solutions that allow you to totally maximize operating efficiency with amazing accuracy and repeatability, superior  more...
Yargus Manufacturing
The flagship blending system for the Layco product line is the fully automated Layco DW System™. The advanced technology of the Layco DW (Declining Weight) system results in a blending  more...
Yargus Manufacturing
The LAYCOTE™ Automated Coating System provides a new level of coating accuracy for a stand-alone coating system or for coating (impregnating) in an automated blending system. The unique  more...
John Deere
The DN345 Drawn Dry Spreader can carry more than 12 tons of fertilizer and 17.5 tons of lime. Designed to operate at field speeds up to 20 MPH with full loads and the G4 spreader uniformly  more...
Force Unlimited
The Pro-Force is a multi-purpose spreader with a wider apron and steeper sides. Our Pro-Force has the most aggressive 30” spinner on the market, and is capable of spreading higher rates of  more...
BBI Spreaders
MagnaSpread 2 & MagnaSpread 3 — With BBI’s patented multi-bin technology, these spreaders operate multiple hoppers guided by independent, variable-rate technology. These models are built on  more...


Comments (1) Leave a comment 

Name
e-Mail (required)
Location

Comment:

characters left

Brian Heinze    
Roseburg, OR  |  June, 06, 2011 at 04:28 PM

Sounds like an ad for Prosaro and Caramba! Other post patent fungicides like Willowood's Tebucon 3.6SC provide very good control for scab and are more affordable for growers to use.


LPV Seed Treater

The LPV Seed Treater has set a new standard boasting three configurable weighing methods for any-sized operation, a standard 42” ... Read More

View all Products in this segment

View All Buyers Guides

Feedback Form
Feedback Form