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Survey Wheat Stem Sawfly
Wheat producers in sawfly impacted areas should consider conducting a survey prior to harvest to determine the severity of the sawfly population. After the survey has been completed, swathing or harvesting first the heavily infested fields should be considered to minimize losses due to lodging. For control, fall tillage could be considered as a means of reducing sawfly infestation potential next year.
At least two samples should be taken per field or wheat strip. One sample is taken near the long margin of the field within the first few drill rows and the other near the center of the field. At each location, 50 consecutive wheat stems of a drill row are examined for stubs cut off by the sawfly larvae. The total number of these sawfly stubs found in the two samples is recorded as the percentage of infestation for the field.
Infested fields are placed into one of four infestation ratings based on the percentage of cut stems: light, 0 to 5 percent of the stems cut; moderate, 6 to 24 percent; heavy, 25 to 39 percent, and severe, 40 to 100 percent.
If sawfly ratings are at the moderate rating or higher, management practices to address the pest should be considered.
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