Relationships of Environmental and Cultural Factors with Severity of Gray Leaf Spot in Maize

Plant Disease
Alka Bhatia, G P Munkvold

Abstract

Gray leaf spot of maize caused by Cercospora zeae-maydis is a major foliar disease in the United States and other parts of the world. Efficient management of gray leaf spot is hindered by a lack of quantitative information regarding environmental and cultural influences on disease severity. We collected environmental, cultural, and disease severity data in southern Iowa at 13 locations in 1998 and 11 locations in 1999. The independent variables that we considered included temperature, relative humidity, leaf wetness, percent maize residue cover, distance to nearest maize residue, planting date, and previous crop. A time-duration value (TDV) variable was created to represent cumulative hours of favorable temperature (22 ≤ T ≤ 30°C) and relative humidity (≥95%). Disease severity was assessed at 2-week intervals on three to eight maize genotypes differing in gray leaf spot resistance and maturity at each location. Environmental, cultural, and disease data were summarized for four different periods during the growing season and analyzed by stepwise multiple linear regression in order to determine which variables significantly contributed to gray leaf spot severity at the dough or dent growth stages of maize. In 1998, genotype resis...Continue Reading

References

Oct 1, 1999·Plant Disease·Julian M J WardForrest W Nutter
Jul 1, 1998·Plant Disease·Carol E WindelsTom Knudsen
Mar 1, 1997·Plant Disease·Patrick M PhippsDavid R Walker

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