Abstract
The bidirectional effects of the common bean (Phaseolus vul-garis) onto rust disease (Uromyces appendiculatus) epidemics and vice versa were studied in controlled growth chamber experiments. Bean plants of the variety ‘Dufrix” were inoculated with a suspension of 1 × 105 urediniospores ml-1 at one of three plant ages, designated as I1, I2 or I3, respectively, or left non-inoculated. Plant ages at inoculation were 22, 29, and 36 days after sowing (DAS) in experiment A, and 25, 32 and 39 DAS in experiment B.
Effects of leaf position and age on bean rust epidemics were evident whereby up to 10 fold more disease was found on the first two trifoliates as compared to the unifoliate leaves. The respective proportions of diseased leaf area on a plant basis 10 and 18 days after inoculation were 0.06 and 0.25 for I3 compared with 0.16 and 0.33 for I1 (experiment A). Bean rust epidemics affected the maximum leaf area of Phaseolus beans, the highest effect (38% reduction) recorded from plants inoculated at I1 in experiment B.
Bean rust negatively affected actual yield of Phaseolus beans with averaged yield losses of 65.5, 34.4 and 14.0% (pooled data of experiments A and B) from treatments I1, I2 and I3, respectively. Host-disease-yield relationship was well explained by a multiple regression model consisting of the predictor variables mean total leaf area and total lesion area and predicted an average yield loss of 4.25% for each 1% increase of mean rust severity.
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Mersha, Z., Hau, B. Reciprocal effects of host and disease dynamics in the bean rust pathosystem. J Plant Dis Prot 118, 54–62 (2011). https://doi.org/10.1007/BF03356382
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DOI: https://doi.org/10.1007/BF03356382