Studies on the Economic Threshold and Forecasting Model for Occurenie of Wheat Powdery Mildew

doi:10.3321/j.issn:1000-7091.1992.01.017

Abstract

Abstract: The effect of wheat powdery mildew (Erysiphc graminis f.sp.tritici) on the yield of wheat was determined over 5 years in the field plots,linear relationship betty een the percentage of disease index and grain yield at growth stage of wheat, According to linear regression equation-0.2231+0,3219X) the economic threshold of wheat powdery mildew can be calculated, A multiple regression equation (Y=11.0308+16.06 0,1445Ji'Z,pathogen,where X2=sum=disease index of spring,X2=sum of rainfall analysis by from late March to April) was (1979-1988) of derived,winter from stepwise epidemic regression 10-years data occurence and of wheat powdery mildew. The results showed that the fitting-test probebilities were over 99% with X2-test.

Key words: Wheat powdery mildew, Economic threshold, Forecastiug model

Lei Tiwen. Studies on the Economic Threshold and Forecasting Model for Occurenie of Wheat Powdery Mildew[J]. ACTA AGRICULTURAE BOREALI-SINICA, 1992, 7(1): 100-106. doi: 10.3321/j.issn:1000-7091.1992.01.017.

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