Premium
Evaluation of Rate‐Limiting Resistance to Blast Disease in Rice Cultivars Using Sub‐Lethal Concentrations of a Systemic Fungicide
Author(s) -
Brodny Uzi,
Zapata J. Castano,
Nelson R. R.
Publication year - 1988
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1988.tb01004.x
Subject(s) - fungicide , biology , cultivar , limiting , blast disease , seedling , spore , inoculation , horticulture , agronomy , toxicology , botany , gene , mechanical engineering , biochemistry , engineering
Abstract Six rice cultivars were shown to have measurable levels of rate‐limiting resistance (RLR) to blast disease in the seedling stage in the greenhouse, as compared to a susceptible cultivar. The criteria for RLR were: a consistent ability to reduce receptivity, sporulation capacity and an extension of the latent period. Another method for a quantitative evaluation of the RLR to blast disease was developed. This procedure used sub‐lethal concentrations of the systemic fungicide Tricyclazole. It was found, that a certain threshhold (225–525 μg a.i./ml) of fungicide concentration could be used to determine different levels of RLR and that the minimum concentration of the fungicide needed for complete inhibition of the disease in a given cultivar is related to the level of its RLR.