Integrated Desease Management Guide For Small Grain

Erik L. Stromberg

Disease Management and Practices Foliar Diseases Seed and Seedling Diseases Root and Crown Diseases Head Diseases Virus Diseases

 

Determination of treatment threshold for leaf and glume blotch in wheat


Scout fields weekly from Zadoks' Growth Stage 31 through 73 (Feekes' 6 through 11). Randomly select 10 locations within a wheat field. At each randomly selected location, examine and record number of indicator leaves out of ten main tillers with one or more leaf and glume blotch lesion(s). If 25% of the (100) indicator leaves in the field have one or more lesions then a fungicide application is indicated.

 

Indicator leaves are:

Flag-4 and Flag-5 for Zadoks' Growth Stages 31-37 (Feekes' 6-8) 

Flag-3 for Zadoks' Growth Stages 38-45 (Feekes' 8-10)

Flag-2 for Zadoks' Growth Stages 46-59 (Feekes' 10-10.51)

Flag-1 from Zadoks' Growth Stages 60-73 (Feekes' 10.52-11)

 indicat.jpg (37820 bytes)



Last updated on February 24, 2000.