Experiments were conducted by using RAM Air Sampler for Use with Moving Vehicle to estimate field disease severity of wheat powdery mildew during 2002-2005. Results showed that there was significant correlation between field disease index and trapped spore number. Therefore, two models relating field disease index to spore number trapped were constructed using data from 2002 and 2005, or 2003 and 2004, respectively. These two models can be used to estimate field disease indexes of wheat powdery mildew in different years when disease severity is different.
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