Abstract
The effects of temperature and soil moisture on infection and disease development by Rhizoctonia solani on soybean were studied individually. In addition, the anastomosis group of R. solani isolates recovered from soybean from 35 fields in 15 counties was determined. All of the 44 isolates recovered in this study were AG-2-2 IIIB. Five isolates of R. solani were able to infect and colonize soybean roots and hypocotyls at 20, 24, 28, and 32°C in growth chamber studies. The temperatures evaluated in this study were not limiting to the isolates tested. In greenhouse studies, nine R. solani isolates and a noninoculated control were evaluated at 25, 50, 75, and 100% soil moisture holding capacity (MHC). Root weights were greater and percent stand averages higher at 50 and 75% than at 25 or 100% MHC; however, as percentage of control, the main effect on percent moisture for percent stand, plant height, or root weight was not significant. There were significant differences among the isolates for the percent stand, root rot rating, and root fresh weight of soybean in each study. In both temperature and moisture studies, the R. solani isolates could be separated as predominantly causing (i) seed rot, as detected by greatly reduced plant...Continue Reading
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Citations
Aug 6, 2019·Phytopathology·Olutoyosi O Ajayi-OyetundeCarl A Bradley
Dec 19, 2008·Pakistan Journal of Biological Sciences : PJBS·Reza Farrokhi-NejadS Ali Moosawi-Jorf
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Jan 1, 2008·Plant Disease·C A Bradley
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Apr 1, 2017·Plant Disease·Olutoyosi O Ajayi-Oyetunde, Carl A Bradley
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Dec 29, 2020·PloS One·Ananda Y BandaraPaul D Esker
Dec 12, 2020·Ecology and Evolution·Patrick G CannonRobert P Freckleton
Nov 10, 2021·Plant Disease·Douglas H Minier, Linda E Hanson