Agronomy eUpdate April 17th, 2020

Issue 795

Another round of cold weather brings a risk of freeze injury to Kansas wheat

Another round of very cold temperatures have put much of the Kansas wheat crop at risk for freeze injury. What portions of the state have the greatest potential for damage? What areas may have escaped with little impact?

wheat freeze injury 

Time to start scouting wheat for stripe and leaf rust

With more reports of stripe rust appearing in Oklahoma and a recent report of disease in southeast KS, the time to start scouting wheat fields is now. Photos and scouting tips are featured in this article from K-State Plant Pathologist Dr. Erick DeWolf.

wheat disease stripe rust leaf rust 

Cold soils can lead to chilling injury for newly planted corn

Cold temperatures can result in injury to the germinating corn seed as it absorbs moisture - a problem called imbibitional chilling injury. Damage can occur when soil temperatures are at or below 50 F.

corn soil temperature chilling injury cold soil 

Nitrogen loss potential during the winter and early spring

When field conditions allow, fall application of nitrogen (N) is a common practice for Kansas producers. What factors determine the nitrogen loss potential over the winter and early spring months?

nitrogen nitrification fall-applied fertilizer N loss potential 

Key nutrients for soybean production in Kansas

Compared to other summer crops, soybeans remove significant amounts of nutrients per bushel of grain harvested. They need an adequate nutrient supply at each developmental stage for optimum growth. Read more about the key nutrients for soybean production.

soybeans nutrient requirements soybean fertility 

Herbicide applications and cold temperatures

Recent drops in temperature have prompted concerns about the effectiveness of herbicide applications made during cold weather. What are the risks when applying herbicides during cold weather?

herbicide application 

Spring freeze effects on winter canola

Several factors determine the extent of freeze damage to winter canola during the spring. It is most tolerant in the early stages of growth and most vulnerable in the flowering and pod-filling stages. Read more about the risk of damage to this year's crop.

canola freeze injury winter canola 

Insect update on alfalfa weevils and pea aphids - April 17, 2020

The latest update from K-State Extension Entomology on insect activity across Kansas includes alfalfa weevils and pea/cowpea aphids. What effect, if any, has the recent cold temperatures had on these insects?

pea aphids alfalfa weevils 

K-State's Soil Testing Lab and Plant Disease Diagnostic Lab are OPEN!

Just a reminder that the Soil Testing Lab and Plant Disease Diagnostic Lab on K-State's Manhattan campus are both open and accepting samples. Details are outlined in this article.

Soil Testing Lab Plant Disease Diagnostic Lab