Effects of high temperatures on scald lesion development and sporulation in barley infected with Rhynchosporium secalis

Abstract

Temperature treatment at 40¦C, but not at 35¦C, inhibited scald lesion production and sporulation of R. secalis in barley leaves infected by R. secalis if the temperature treatment was applied during the first 7-8 days of infection but not if infected plants were treated later than the eighth day. Exposures at 40¦C for 4 h had a greater effect than exposures for 2 h in most cases, but increasing the treatment duration from 4 to 6 h did not reduce lesion development or sporulation further.