Photo by Steven Clough
USDA and University of Illinois researchers are working together to understand a new disease affecting soybean in Illinois, red crown rot (RCR) causedby Calonectria ilicicola. Occurrence of RCR was first reported on soybean in the United States in 1972, but the disease was only recently reported on soybeans in Illinois. However, because the foliar symptoms resemble SDS (see photos above) it might have been present longer and people didn’t realize it.
Photo by Steven Clough
RCR resembles SDS but the most distinguishing sign of RCR is the reddish coloration at the base of the stem, and the possible presence of small reddish globules which are the fungal reproductive structures called perithecia (see photos above). The red discoloration darkens as plants mature.
Please assist researchers studying this new disease by helping us collect samples and letting us know approximately where samples were collected. One aspect of the analyses is to document its spread and characterize its diversity, so we need samples from many different locations across the state. Samples can be the entire plant or only the infected crown region. Individual samples can be placed in a plastic bag and kept cool until you can ship.
Photo by Steven Clough
Photo by Steven Clough
Please see Plant Clinic form and address below.
For more info:
http://cropdisease.cropsciences.illinois.edu/?p=1220
https://soybeanresearchinfo.com/research-highlight/dont-rule-out-red-crown-rot/
https://www.ilsoyadvisor.com/red-crown-rot-soybean-illinois/
U of IL Plant Clinic & USDA Soybean Red Crown Rot Free Sample Diagnosis Form – click here to download
Field location (GPS coordinates or landmarks—if sending multiple samples, please place one sample per plastic bag and place a piece of paper with this info in each sample bag, or write it on each bag with a marker):
Town/Township and County (and state, if not IL):
Name:
Email or Phone:
Samples should be kept cool and shipped early in the week.
Please include this form and ship to:
Plant Clinic
S-417 Turner Hall
1102 S. Goodwin Ave.
Urbana, IL 61801
About the Author: Steven Clough
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