A Damage Function for Stem Rust of Perennial Ryegrass Seed Crops
نویسندگان
چکیده
منابع مشابه
A damage function for stem rust of perennial ryegrass seed crops.
Observations of naturally occurring stem rust epidemics and seed yields in perennial ryegrass were taken in 19 field experiments conducted over the course of 9 years. Epidemic severity differed among years and also among experimental treatments (fungicide regimes) within years. In each experiment, attainable yield was represented by the nondiseased treatment, and yields of other treatments were...
متن کاملStem rust in perennial ryegrass seed crops: epidemiological and genetic research at USDA-ARS
In production of perennial ryegrass seed in the Northwest USA, stem rust is the primary disease constraint in terms of management cost and potential yield loss. The USDA-ARS research program on this problem is focused on improved decision making for fungicide use, and tools for genetic improvement. Data from 10 years of field and greenhouse research was used to construct an epidemiological mode...
متن کاملPrediction of stem rust infection favorability, by means of degree-hour wetness duration, for perennial ryegrass seed crops.
ABSTRACT A weather-based infection model for stem rust of perennial ryegrass seed crops was developed and tested using data from inoculated bioassay plants in a field environment with monitored weather. The model describes favorability of daily weather as a proportion (0.0 to 1.0) of the maximum possible infection level set by host and inoculum. Moisture duration and temperature are combined in...
متن کاملA simulation model for epidemics of stem rust in ryegrass seed crops.
A simulation model (STEMRUST_G, named for stem rust of grasses) was created for stem rust (caused by Puccinia graminis subsp. graminicola) in perennial ryegrass grown to maturity as a seed crop. The model has a daily time step and is driven by weather data and an initial input of disease severity from field observation. Key aspects of plant growth are modeled. Disease severity is modeled as rus...
متن کاملDemonstration of pathotype specificity in stem rust of perennial ryegrass.
Rust diseases cause significant damage in forage and seed crops of perennial ryegrass (Lolium perenne), which is highly heterozygous and heterogeneous and thus presents difficulty in genetic analysis. There has been no definitive demonstration of the existence of pathotypes for stem rust or other rusts of perennial ryegrass, although experiments with crown rust (Puccinia coronata) of this host ...
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ژورنال
عنوان ژورنال: Phytopathology®
سال: 2009
ISSN: 0031-949X,1943-7684
DOI: 10.1094/phyto-99-5-0498