By Blake Jackson
As soybean plants transition from vegetative growth to reproductive stages, growers may notice uneven areas within fields where plant development varies.
According to Paul D. Esker, Professor of Epidemiology and Field Crop Pathology, Alyssa Collins, Associate Research Professor, and Adriana Murillo-Williams, Extension Educator at Penn State Extension, these differences can result from a variety of factors, including environmental conditions, diseases, or other stresses affecting plant growth.
Uneven stands provide an opportunity for farmers to closely inspect fields and identify potential issues, particularly soybean stem diseases, which can significantly affect yield and crop performance.
Experts recommend monitoring areas that continue to lag behind the rest of the field as the season progresses. Accurate disease identification is essential because it helps producers assess possible yield losses and make informed decisions about future variety selection, resistance traits, and crop rotation practices.
Diagnosing soybean stem diseases often begins with understanding the disease resistance characteristics of the soybean variety being grown. Field scouting should focus on both external stem symptoms and internal stem tissue.
If no visible stem symptoms are present, examining the pith tissue can provide important clues. Brown-colored pith tissue may indicate brown stem rot, while white pith may require further evaluation of leaf symptoms and other disease indicators.
Extension specialists emphasize that successful disease management relies on early scouting and correct diagnosis.
Identifying the specific cause of stem damage allows growers to implement appropriate management strategies, reduce future disease risk, and protect long-term soybean productivity.
Photo Credit: istock-urpspoteko
Categories: Pennsylvania, Crops, Soybeans