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Issue No. 3/April 20, 2012

Stripe Rust of Wheat Update
Stripe rust of wheat has been observed in several counties of southern Illinois. In some cases, stripe rust is present only on lower leaves, while in other cases stripe rust is present on the flag leaf. It is important that fields be scouted for stripe rust.

Is It Time to Plant Soybeans?
In a change from past findings, studies in 2010 and 2011 showed that soybeans suffer little yield loss from planting delays until after the middle of May, with relatively mild losses from planting in late May. So finishing corn planting, then starting in with soybean planting may be sound management, at least after mid-April.

Get Regional News through New Extension Websites
Four new regional websites, each including a blog, are available from the four commercial agricultural educators with University of Illinois Extension.

Black Cutworm Moth Flights Remain Intense--Freezing Temperatures Have Minimal Effect on Potential Cutting Threat
Don't assume that freezing temperatures have eliminated any black cutworm threat, and don't take for granted that a Bt hybrid will provide adequate protection against infestations.

Honey Bees and Neonicotinoids Addressed in Purdue University Webinar
Education is available free online about the potential impact on honey bee populations of the widely used neonicotinoid class of insecticide.

Options to Control Corn Plants from the Initial Planting
For corn producers who decide to replant damaged stands, existing plants may need to be controlled first.

Soil-Residual Herbicides: Factors Influencing Performance
A new publication from Illinois weed scientists explains the factors that influence the effectiveness of soil-residual herbicides, including factors under the control of the user.

Weed Science Odds and Ends
Guidance is provided for effective weed management during an unusual start to the cropping season.

Yes, It's Time Again to Control Biennial Weeds in Pastures
Biennial weeds, including thistles and poison hemlock, are showing up in pastures and along roadsides. Successful management requires integrated, systematic steps to prevent seed production and spread.

Fusarium Head Blight (Scab) of Wheat--Risk Assessment and Management
Wheat plants that are beginning to head out and flower are susceptible to infection by the fungus causing scab, which can reduce yield, test weight, and quality in addition to producing toxins that contaminate grain.

Symptoms of Wheat Viruses Present in Illinois Wheat Fields
It can be very difficult to diagnose viral diseases, and going by symptoms alone often results in misdiagnosis. Be sure to use a diagnostic lab that runs virus-specific assays. For the best management of wheat viruses, plant varieties with high levels of resistance.

Will Frosted Corn Recover?
Advice about replanting decisions is outlined for producers with corn that has experienced frost injury.