End Treatment of Hackberry Logs to Prevent Blue Stain

Hackberry logs and lumber were studied to determine the effect of chemical spray end treatment on the occurrence of blue stain. Three groups of 30 logs each were tested. The first log group was treated immediately after felling, the second log group was treated 24 hours after felling, and the third log group received no treatment. The logs were stored for 4 weeks before they were sawn into lumber. Results showed that chemical spray end treatment did reduce the average length of end stain in lumber sawn from the test logs. The average end stain length for the untreated group was 31 inches as compared to 17 and 15 inches for the treated groups. However, value comparisons of the graded lumber showed that total stain content was not reduced due to treatment.

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