Epidemiological basis of resistance to Rhizoctonia solani Kuhn in sorghum
1990
Pascual, C.B. | Raymundo, A.D. (Philippines Univ., Los Banos, College, Laguna (Philippines). Inst. of Plant Breeding)
Rhizoctonia sheath blight development was studied on the susceptible cultivar, UPL Sg and the resistant accessions CS-621 and CS-622. Disease level on the final observation date, 49 days after initial symptom appearance, was higher on UPL Sg-5 than on CS-621. Infection rate were 0.052 and 0.031 unit per day, respectively. Relative to UPL Sg-5, resistant accession reduced the rate of disease development by 40.3 percent. Lesion size on CS-621 and CS-622 was significantly smaller than UPL Sg-5. The number of sclerotial bodies produced per plant was significantly different among the three host genotypes. CS-621 had the least number while UPL Sg-5 produced the highest amount of sclerotia. Since sclerotial bodies are the source of inoculum, a previous planting of a susceptible cultivar may contribute to a higher incidence of Rhizoctonia solani during the next cropping season.
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